Iron Gate Welding: Materials, Codes, Techniques, and Long-Term Durability

A gate that once swung effortlessly can start dragging against the ground after just a few seasons. More often than not, the culprit isn’t the hinges or rust, but poor weld fit-up, heat distortion, or the wrong approach to welding the frame from the start.

Introduction to Iron Gate Welding

Every seasoned fabricator knows the moment all too well. A gate that once swung freely, kissed its latch with ease, and cleared the driveway with room to spare suddenly begins to drag. It catches on the concrete, creaks against its posts, and no amount of hinge adjustment seems to bring it back to true. More often than not, the root of that frustration has nothing to do with the hinges themselves. It comes from poor fit-up, heat distortion, or a rushed approach to welding the frame right from the start. This is exactly why iron gate welding has earned its place as its own craft. It demands a different mindset than welding a simple bracket or patching a broken part. It demands thinking in terms of geometry as much as it does in terms of weld metal.

Before any arc is struck, it’s important to clear up a common point of confusion. The vast majority of what people call “iron gates” today are not made from true puddled wrought iron at all. Most modern gates are fabricated from mild steel, such as A36, shaped into pickets, rails, and frames. True wrought iron is still out there in heritage restorations, but for new fabrication, mild steel is the material that most shops reach for. The decorative scrolls and spears may be styled to give a classic wrought iron look, but behind that aesthetic sits structural steel. Knowing that distinction sets the tone for the rest of the job, as the behavior of steel under heat is very different from the expectations people bring to the name “iron”.

This difference becomes even more critical once you start treating the gate as a structure rather than a piece of art. A simple rectangle made from four members is not rigid on its own. Left unbraced, that rectangle will flex and rack with every opening and closing cycle. With enough force from wind, sagging ground, or even just the weight of the leaf, it will twist out of square. For this reason, gate frames behave as mechanisms. Only once those members are braced into triangles does the frame gain the resistance it needs to stay true. Proper iron gate welding is just as much about that geometry and fit-up as it is about depositing weld metal.

With that in mind, the purpose of this article is to walk through the full process of fabricating a strong, long-lasting iron gate from a structural standpoint. The scope is purely informational, designed for fabricators looking to build with more intention, or for those wanting to understand why some gates stand the test of time while others begin to bind after a single season. The sections to follow will cover material selection, applicable welding standards, post and bracing design, layout and distortion control, process selection and technique, common mistakes and troubleshooting, safety and quality control, finishing and corrosion protection, and a practical checklist to tie it all together. No single one of these steps can be skipped. The strength of the finished gate is the sum of all of them working in unison.

It is also worth noting that not every gate project is created equal. A lightweight pedestrian gate hung from a single post has very different demands than a wide driveway gate exposed to high wind. For structural steel work of this type, fabricators will often reference guidance from the AWS D1.1/D1.1M Structural Welding Code to understand expectations for structural welds. These expectations don’t always mean a project requires a full code qualification, but they do reflect proven practices that translate directly to gate work.

Finally, while this guide focuses primarily on steel gate fabrication, the world of metal joining is wide. Those looking to expand their knowledge beyond ferrous work may find value in resources such as Aluminum MIG Welding: The Complete Practical Guide to see just how differently heat input and fit-up must be approached with non-ferrous materials. The principles of precision and restraint still apply, just with an entirely different set of rules. With those foundations in place, the rest of this guide will build from geometry first, because for iron gate welding, a square frame built with discipline will always outlast a crooked one built with excess weld metal.

Gate Materials: Solid Bar, Tube, and Hollow Section Selection

The gate is half decided before the first arc, because the metal you pick for frame, pickets, and posts decides how it welds, hangs, fights wind, and survives before rust wins. One thing catches people out: hollow section costs more per weight than solid bar, since it is a tube formed and welded in a mill, not cut from bar. That extra cost often returns as a stiffer, lighter frame. The overlooked spec is wall thickness.

Solid Square Bar

Solid square bar is the traditional choice for pickets, decorative scrolls, and flat-bar gates. It cuts easily and welds cleanly with almost any process. A 1/2 in. solid square bar is the classic residential picket dimension: enough mass to look substantial, no flutter in wind, and it resists a child leaning on it. Nothing corrodes from the inside out and no cavity collects rainwater. The catch: heavy for the strength delivered, corrosion starting on the outer skin, and slow heat-up that makes it forgiving to weld but slow to cut.

Round Bar

Round bar is standard for hoop-style gates, curved rails, and ornamental infill. It takes a bending jig or mandrel better than square or rectangular options, so it suits rolled rather than cut members. It resists bending about one axis but is weak about the perpendicular axis, so a round-bar frame needs flat bar or bracing to restrain it. It welds differently: fewer flat surfaces means a fillet weld has less to land on, so joints often become partial penetration or butt joints with a backing strip. For a loaded frame, hollow section is usually the better structural choice, with round bar for ornament inside a stiffer frame.

Square and Rectangular Hollow Section

SHS and RHS are the workhorses of modern gate fabrication. Because the material sits away from the neutral axis, hollow section delivers far more stiffness per unit weight than solid bar of the same outside depth. You get the depth of a 2 in. member at roughly the weight of something much smaller in solid form, and it stays rigid in every direction the gate gets pushed. Rectangular hollow section suits members that must resist bending strongly in one plane but stay lighter than solid. The classic leaf uses rectangular tube for top and bottom rails, where vertical load and racking force are highest, and square tube for the stiles that take the hinge push.

Wall Thickness: The Specification That Decides the Weld

Wall thickness drives everything downstream: wire or electrode size, travel speed, heat input, filler choice, and whether you can run a fillet weld at all or must groove the joint for full penetration.

• Below roughly 0.060 in. (1.5 mm): sheet-like territory, where the tubular provisions of AWS D1.1/D1.1M get uncomfortable. Many such sections fall under AWS D1.3 for sheet steel or must be treated as sheet rather than tube. Burn-through and lack of fusion become the primary risks.
• 0.083 in. (2.1 mm) and 0.093 in. (2.4 mm): common structural tube, workable with short-circuit MIG/MAG transfer at lower amperage, and the wall thickness many tubular connection qualifications are based on.
• 0.120 in. (3.0 mm) wall and heavier: robust and forgiving, better for post sections and direct-load members. Heat input rises, so distortion control matters more.

A 1 in. x 1 in. square tube with a 1/8 in. wall is a common residential frame member and a good choice, because it takes a fillet weld without melting through. A 16-gauge wall on the same nominal size is not. The Steel Tube Institute notes that tubular connections do not all behave the same way, and that connection detail, wall thickness, and joint qualification all have to line up. That wall size is what makes the standard residential combination work: 1 in. x 1 in. square tube with a 1/8 in. wall for the frame and 1/2 in. solid square bar for pickets.

Choosing Posts and Frames

Posts live in a different world from the leaf. A post carries the leaf and the hinge loads and resists overturning when wind pushes the open gate, so section depth and embedment matter most. Solid bar posts of 1-1/4 in. or larger, or square tube posts with a 3/16 in. wall or heavier, are common choices, and a post that will sit in concrete should be grouted in rather than relying on soil friction. For the leaf, the rule most fabricators land on: square hollow section for stiles, rectangular hollow section for horizontal rails where you need to resist sag, solid square bar for pickets, and round bar only where you need a curve.

Corrosion Considerations

• Hollow section traps moisture, dirt, and salt inside the cavity. Seal the ends and you can create a pocket that holds condensation; leave them open and water sits on the lower rail.
• Solid bar has no cavity, so nothing is hidden, but it corrodes from the outside in and rust runs down onto whatever is below it.
• Thin walls corrode through sooner. A 1.5 mm wall can be compromised by surface rust in a fraction of the time it takes a 3 mm wall, another reason to favor heavier walls on gates exposed to weather.
• Weld zinc coating if the material is galvanized or powder coated. Galvanizing is usually applied after fabrication, so post-weld cleanup and coating prep determine how well the finish lasts.

Matching Material to the Job

A pedestrian gate, a side gate in a driveway, and a 12 ft. double gate on a commercial property do not share a material list. The pedestrian gate can be 1 in. square tube with a 1/8 in. wall and 1/2 in. solid square bar pickets, light enough for one person to hang. The driveway gate needs heavier posts, deeper section, and a diagonal brace sized for the span. The commercial gate may need 6 in. or 8 in. tube, a perimeter frame of channel or solid plate, and stricter welding qualifications.

The trap is treating material choice as a simple cost decision. Buying hollow section because it looks better, then welding it with settings you used on solid bar, is how gates end up with burn-through, weak joints, and distortion. The section, the wall thickness, and the process matched to it are one decision, not three.

With the material settled, lay the frame out flat and square it properly, because a perfectly welded gate built on a crooked frame will still swing badly. That brings us to layout, fit-up, and tack sequencing.

Welding Codes and Standards That Apply to Iron Gates

If you have ever had a gate signed off by a building official, you know the word “code” carries weight. Codes are not there to slow fabricators down. They exist so that in year five, when a hinge bolt has worked loose, nobody has to argue about whether the weld was sound. For iron gate welding, two documents come up most often: AWS D1.1/D1.1M, Structural Welding Code – Steel andAWS D1.3/D1.3M, Structural Welding Code – Sheet Steel.

Why AWS D1.1 Is the Reference Point

AWS D1.1 is the most widely referenced structural welding code for welded steel in North America. It is not a “gate code.” It covers buildings, bridges, towers, and other welded steel structures, and it is the document engineers and inspectors point to when a steel fabrication has to be documented. It provides four things that apply directly to gate work:

• Welding procedure specifications (WPS): filler metal, position, voltage and amperage range, travel speed, preheat, shielding gas, and joint details.
• Welder qualification: procedure and performance tests proving a welder can make sound welds in the positions and process they will actually use.
• Fabrication requirements for assembly, fit-up, alignment, and dimensional tolerance.
• Inspection and acceptance criteria for visual and, where required, nondestructive examination.

The AWS D1 Committee on Structural Welding maintains D1.1 along with the other D1.x documents. The code is revised on a roughly three-year cycle, with the 2025 edition current at the time of writing, so always confirm the edition named on a project specification.

The 1/8 in. (3 mm) Line: When D1.3 Takes Over

Clause 1 of AWS D1.1 addresses base metal thickness directly: when base metals thinner than 1/8 in. (3 mm) are to be welded, the requirements of AWS D1.3 should be considered. Thin material changes everything. Heat input that would be routine on solid bar will melt through 16 gauge steel, and a tube wall that is fine in structural HSS becomes a burn-through problem at the corner.

• Most structural gate stock is above the threshold. Square bar, round bar, and light wall structural tubing typically exceed 3 mm, so D1.1 governs the bulk of a typical gate frame.
• Decorative sheet and thin wall elements drop into D1.3 territory. Sheet infill panels, thin wall formed sections, and cladding details under the 3 mm line belong to D1.3.
• D1.1 can still be applied to thin material where procedures were qualified for that thickness and the design allows it. The code points you toward D1.3; it does not stop an engineer from specifying D1.1.

One wrinkle worth knowing: under D1.1, structural tubing above a certain wall thickness qualifies for the same filler metal and process control as solid material. As walls get thin enough that heat input matters, D1.1 calls out supplementary welding process requirements, a more conservative heat input limit designed to prevent burn-through in thin-wall tube.

Plate-Qualified vs. Tubular-Qualified Welds

This is the distinction that causes the most expensive surprises. Procedure qualification in AWS D1.1 comes in two families. Plate qualification means test welds made on plate coupons, tested for strength and ductility, covering welds made with the same process and filler metal on plate. Pipe or HSS qualification uses tubular coupons and details a specific joint configuration.

Connection type	Typical gate detail	Qualification path
Plate to plate	Base plate to post, end plate to rail, shear tab to frame	Plate qualification acceptable
Plate to tube	Gusset or connection plate welded to HSS wall	Plate qualification, tube factors handled separately
Tube to tube, flat	Rail butt-welded or spliced end to end	Plate qualification acceptable
Tube intersecting tube	Brace or picket landing perpendicular on a rail	Tubular T, Y, or K qualification

Most everyday gate connections fall in the first three rows, so plate qualifications are acceptable under AWS D1.1 for base plates, end plates, shear tabs, flat butt splices, and welded plate transitions, even on a frame built from structural tube, provided geometry and thickness fall within the qualified ranges. Tubular qualifications are reserved for intersecting members: a T-connection where one member runs into another at 90 degrees, a Y-connection where members meet at an angle with one branch roughly perpendicular, and a K-connection where two branches arrive at an angle on the same side, which is what a diagonal gate brace looks like landing on a rail.

These are the joints the Steel Tube Institute warns about directly: not all tubular connections are welded equal. An intersecting joint concentrates force at the weld toe, distorts the tube wall, and can produce a weld that looks fine but is neither as strong nor as ductile as a plate weld of similar size. That is why tubular qualifications carry their own test requirements and acceptance criteria instead of borrowing the plate results.

Why a Gate Weld Can Pass Inspection and Still Fail

Many gate failures are not code failures. They are workmanship failures inside code-compliant welds: a beautiful fillet weld on a distorted tube, a brace oriented so it works in tension instead of compression, a post set slightly out of plumb so the leaf racks. Codes govern the weld, not the geometry, fit-up, or post setting. When a drawing notes “AWS D1.1,” it says the weld must be made to a qualified procedure by a qualified welder and inspected to D1.1 acceptance criteria. It says nothing about whether the leaf is square. A gate can be welded to a textbook procedure and still drag on the ground in a year.

When Formal Qualification Is Actually Required

You do not need a qualified procedure for every gate, but formal qualification becomes necessary when:

• The gate is part of a means of egress or a fire-rated opening.
• The gate is a component of a structural railing or balustrade system on a commercial or public property.
• The engineer of record or owner specifies D1.1 on the drawings or in the contract.
• The gate is electrically operated and the work falls under a safety program requiring documented procedures.
• The work is subject to a local building or permit authority with its own structural welding requirements.

When qualification is required, two records matter. The WPS is the written procedure, and the welder performance qualification record proves the person holding the torch can execute that procedure in the required positions. A shop with current WPS documents and welder logs on file answers a documentation request in minutes instead of scrambling.

Two safety resources sit alongside the codes in every responsible shop. The OSHA welding, cutting, and brazing page covers fume control, ventilation, and confined space considerations. The NIOSH welding health and safety resources cover long-term exposure, including the respiratory hazards that matter to anyone running an arc several hours a day. Codes tell you how to weld; these tell you how not to damage yourself doing it.

For most residential and light commercial gate work there is no code requirement at all, only well-understood practice: fillet welds sized to the joint, continuous welds where the load reverses, adequate bracing, and square geometry. And when a spec does say D1.1, knowing the plate-versus-tubular distinction is what lets you quote the job correctly instead of discovering on day one that your brace weld needs a tubular qualification you do not hold.

Gate Design Fundamentals: Posts, Bracing, and Structural Forces

Most gate trouble blamed on the welding is really design trouble. The leaf was never braced, so it racked into a parallelogram. The post was sized for weight alone, so a gust tipped it and the frame went out of square.

The Post Is a Structure, Not a Hanger

The post carries three loads at once: the leaf’s weight, side loads from wind and from the gate being shoved, and the largest demand of all, an overturning moment created when wind pushes the leaf sideways like a sail on a long arm. That moment governs post size, and a post sized by rule of thumb (match the largest frame member) works for a pedestrian gate but is badly undersized for a wide double drive gate.

• Never let the post be the thinnest wall in the assembly. If the frame is 3 mm wall tube, the post should be heavier, so the weak point is predictable instead of a surprise.
• Size the post to wind area, not mass. A tall, solid, ornamented gate weighs far more than a wide, light, open-grid gate, yet the wide one catches more wind because it presents a bigger sail area.

Have an engineer check gates that carry real traffic. Structural steel welding in the United States falls under AWS D1.1/D1.1M, the Structural Welding Code for Steel, with connection design running through the AISC guidance on welding. Both separate tube-to-tube from plate-to-tube joints, which is why the Steel Tube Institute warns that not all tubular connections are welded equal. A gate is a structure, even a small one.

Overturning Moment: How Wind Tips a Gate

Wind pressure on the leaf’s exposed area creates a sideways force near mid-height, so the base sees a moment equal to force times height. Taller post, wider leaf, bigger lever arm.

Two responses matter most. Stiffen the leaf: a gate that flexes in the wind absorbs energy and releases it, and that dynamic load is harsher on the post than a static one, so a rigid braced frame cuts hinge movement and peak force. And push the footing deeper and wider, so the heavy base counters the post lifting and rotating in its socket.

Embedment, Frost Depth, and Drainage

Embedment below the local frost line is standard for a reason: water in the soil freezes, expands, and pushes upward, and a post set too shallow gets heaved every winter until the gate hangs crooked and the latch no longer lines up. Check frost depth with your local building department.

Two skipped details cause slow, hidden corrosion. Hollow posts in concrete collect water at the base, inside the tube where you cannot see it, so cap the post or set it in concrete with the top sloped away and the tube well into it. And drain everything: gravel or a perforated pipe around the footing keeps water moving away instead of pooling at the base of the steel.

Post-to-bracket welding is normally field stick work, since the position is vertical and awkward. The case for SMAW in the field is in why SMAW still wins for field and repair work, rod choice for vertical or overhead positions in this all-position welding rod guide, and air arc gouging removes a post set in the wrong spot without torch-cutting the assembly.

Triangulation: Why a Rectangle Wants to Become a Parallelogram

A four-sided frame of rails and stiles is a parallelogram, not a rigid shape. Push a corner and it leans into a rhombus, because all four joints behave like hinges and no member changes length. One diagonal brace divides the frame into two triangles, and a triangle cannot change shape without a side changing length, and steel does not stretch meaningfully. The brace turns a floppy rectangle into a structure that stays square under load, keeping the gate from racking, binding on its hinges, and needing a re-hang every few years.

Squaring first. Bracing only works on a square leaf. Measure both diagonals before tacking and get them within a few millimetres. If they match but the frame is twisted out of plane, check flatness with a string across it. A racked leaf cannot be trued by a brace, and forcing it square during welding gives you a gate that binds after a year.

Brace Orientation: Bottom Hinge Corner to Top Lock Corner

For most swing gates, run the diagonal from the bottom hinge corner to the top lock corner. That path carries the leaf’s weight and side loads axially down the brace into the hinge post, instead of making the corner joints and their welds fight to hold the shape by pure tension. Load arriving at a post is something a post handles well; load arriving as a twist on a welded corner joint is something a weld handles badly. Reverse it and the loads pull the corner joints open, showing up as cracked welds at the top rail ends.

• Single gates, standard height: one diagonal, bottom hinge corner to top lock corner.
• Tall or wide single gates: an X brace, or a diagonal plus a mid-height rail and a short second diagonal.
• Double gates: brace each leaf from its bottom hinge corner to the top center meeting corner, so the diagonals meet at the latch side.

Design element	What it must resist	Typical failure
Hinge post	Weight, overturning, hinge loads	Post tilts, leaf hangs crooked
Diagonal brace	Racking into a parallelogram	Out of square, hinges bind, welds crack
Latch post	Latch reaction, side loads	Post works loose, frame twists
Footing, drainage	Overturning, frost, corrosion	Post settles, gate sags, base rots inside

Fit-Up, Layout, and Tack Welding to Prevent Distortion

Most gate problems that surface a year after installation were created on the bench, before the first arc was struck. A leaf a few millimetres out of square at tacking time will be dramatically out of square once the welds cool and shrink. Distortion in iron gate welding is mostly a fit-up and sequencing problem, not a machine-setting problem, and almost all of it can be controlled with a flat surface, a tape measure, a square, and a sensible tack pattern.

Work on a Flat, Supported Surface

Assemble the frame on a flat, level bench or shimmed, level ground, checking the surface with a straightedge or spirit level. A bowed bench or a rocking slab produces errors that look like fit-up mistakes. Support the frame along its full length so it cannot flex, and support the midpoint of long leaves. Clamp lightly, because heavy clamping dents thin tube and those dents become visible ripples once the metal is heated.

Square the Frame with Diagonal Measurements

Before any tacking, measure both diagonals corner to corner and compare them. Equal diagonals mean a square frame. If they disagree, the frame has racked into a parallelogram, and no amount of careful welding pulls it back to true. A 3 mm difference on a 1.2 m leaf looks trivial on the bench; after a full perimeter weld it can double.

Confirm the frame is also a true rectangle: opposite rails the same length, corners at 90 degrees. A machinist square or a 3-4-5 triangle (300 mm, 400 mm, 500 mm) gives a quick angle reference. If the corners are right but the diagonals disagree, the rail lengths are wrong, so cut new material rather than forcing the frame into shape.

Check	Measurement	Good result
Frame squareness	Both diagonals, corner to corner	Within about 1/8 in (3 mm)
Rail straightness	Straightedge or string line	No bow or banana curve
Picket spacing	Centres from a marked layout line	Even to within a few millimetres

Tack in a Cross Pattern, Then Re-Check

Heat expands metal, and as each bead cools it pulls the parts it joins toward itself. Tack one corner only and it shortens and drags the frame with it. Tack in a cross pattern instead: corner A, the diagonally opposite corner C, then the remaining two, so each tack is opposed by another and thermal movement is balanced rather than accumulated. Re-check the diagonals after tacking and before any production weld; if they shifted, correct the frame with prying or extra tacks.

Keep tack welds small, roughly a 6 to 10 mm fillet, spaced along the joint. The AWS D1.1/D1.1M Structural Welding Code covers fitting-up and tack welding directly, including alignment tolerances and the expectation that tacks meet the quality of the production weld. Treat a tack as a real weld, not glue. For out-of-position tacking, our all-position welding rod guide covers the common electrode choices.

Tack the Pickets Top Rail First, Then the Bottom

Set picket spacing from a marked layout line or story stick rather than by eye. Mark every picket position on both rails, then transfer those marks with a square so the pickets run parallel instead of fanning out. Tacking all pickets at the top rail first, then the bottom rail in sequence, followed by the planned welding order, minimises twisting and doming. The first rail welded shrinks first, and the pickets transfer that shrink into the frame, so position each picket against a straight reference and let the bottom rail meet it.

How Bad Sequencing Twists a Leaf

Take a 1.2 m gate, finish the entire top rail with one continuous bead, then start on the bottom. The top rail contracts, the leaf loses its parallel edges, the diagonals diverge, and the leaf racks in the plane of the gate. The same mechanism domes the gate when every picket is welded to one rail in a single pass: the rail bows, the face bulges, and the diagonals tell you something is wrong.

The fix is ordering plus heat control: stitch long seams instead of running them end to end, start mid-rail and work outward, alternate opposing joints, and plan the sequence on paper before striking an arc. Fit the diagonal brace last, after the leaf is verified square, and check that it lands on the flat of the tube rather than a corner, where the connection detail changes the heat input. The Steel Tube Institute explains why tubular connections behave differently in Not All Tubular Connections Are Welded Equal.

Welding Processes, Parameters, and Techniques for Gate Frames

Once the frame is laid out, squared, and tacked, the welding starts. This is where iron gate welding makes a rigid, square leaf or twisted scrap that never closes, and the difference is rarely the machine but heat control, preparation, and sequencing.

Most gate frames use mild steel: hollow section, solid bar, and plate. Two processes cover nearly all field work, MIG/MAG (GMAW) and MMA (SMAW, or stick). TIG is reserved for decorative stainless or thin brass and bronze, since it is slow on structural frames.

MIG/MAG vs MMA for Gate Work

MIG/MAG is faster, easier on thin wall, and lays a cleaner bead needing little dressing. It suits tube frames because heat input is easy to control by walking the gun along the joint and feathering the trigger, and it spatters less, which matters beside a finished gate in a driveway.

MMA runs on a simple inverter, needs no shielding gas bottle, tolerates dirty mill scale and light rust better than MIG, and works where a MIG gun will not fit. On heavy 3 mm tube and structural posts, stick is often preferred: the electrode can be dragged along the joint for deeper penetration at lower amperage. The advantages of stick welding are worth knowing before you commit.

Rule of thumb: MIG/MAG for the frame and pickets, MMA for tacks, heavy post connections, awkward joints, or inconvenient gas supply. Do not mix filler metals arbitrarily; ER70S-6 wire and E6013 electrodes are broadly compatible, but one consistent system is easier to inspect.

Thin Wall Tube: 1.2 mm to 2.0 mm

Thin wall square tube is where gates get ruined: at 1.2 to 2.0 mm wall, the heat cooks the whole member and leaves a bowed rail, an out-of-square frame, or a burn-through hole in the corner.

• Weld from the middle of each face toward the corners, putting shrinkage where you can absorb it.
• Keep runs short. Continuous 600 mm welds on 1.5 mm tube build a heat sink the metal cannot absorb.
• Use stitch welding, not long continuous beads. Fill gaps on visible faces for a seal; structural interiors can stay stitch welded for a lower-heat result.
• Keep travel speed up with a slight 10 to 15 degree push angle to steer the puddle off the walls and prevent burn-through.

Wire and gas matter as much as amperage. ER70S-6 solid wire at 1.0 to 1.2 mm with an active shielding mix runs roughly 90 to 120 amps on 1.5 mm wall, more on 2.0 mm. CO2 gives a hotter, more penetrating arc; an argon blend runs cooler, cleaner, and spatters less, which suits decorative work. Treat these as starting points only, since voltage and wire feed speed set the result.

The aluminum MIG welding guide explains wire, gas, and polarity logic that transfers directly to steel.

Joint Preparation and Corner Technique

• Clean the zone. Mill scale, oils, and cutting oil trapped under a puddle are the main cause of porosity in gate work. Grind or degrease the last 30 mm of each member at the joint, and remember the mill scale on the back of the tube is where your root pass will sit.
• Butt joints. Bevel where the wall is thick enough to warrant it and leave a root gap of roughly 1.5 to 2 mm on 3 mm wall and above. At 1.5 to 2.0 mm wall, a square butt with a small gap works if you weld from both sides.
• Corners. A 90 degree corner in thin tube concentrates heat. Cut the tube to butt tightly against the mating member, clamp it properly, and use a small fillet. Never fill a poorly fitted corner with extra weld metal. Fit the joint first, then weld it.

Fillet Weld Sizing

Fillet weld size is measured by the leg, one of the two triangular faces of the weld triangle. A common rule of thumb sizes a structural fillet at roughly 0.7 times the thickness of the thinner member, but on gates, think about what the joint must do.

Member	Typical Fillet Leg	Notes
1.2 to 1.5 mm tube	2.0 to 3.0 mm	Heat control beats strength here
2.0 to 3.0 mm tube	3.0 to 4.0 mm	Standard range for frame rails
Solid 10 to 12 mm bar	4.0 to 5.0 mm	Slightly larger leg for rigidity
Post to rail	5.0 to 6.0 mm	Follow the load path into the post

Under AWS D1.1/D1.1M, weld size limits, profiles, and effective throat requirements are set for structural connections, and any gate under contract-specified inspection should follow them. The Steel Tube Institute overview of tubular connections shows how tubular joints are qualified differently from plate.

Welding Both Sides to Balance Shrinkage

Every weld shrinks as it cools. A single fillet on one side of a rail pulls that side together and bows the rail away, twisting the leaf. Welding the opposite side after the first cools adds an opposing shrinkage that largely cancels the first out, so the frame stays flat and square through service. Weld one side fully, let it cool, check the frame against your square, then weld the opposite side, alternating in short segments for an early read on distortion.

Heavy Sections: 3 mm Wall Tube and Posts

Thicker material needs more heat, and more heat means more distortion. For 3 mm wall tube, run roughly 130 to 160 amps on MIG with 1.0 mm wire, and on MMA a 3.2 mm electrode at around 90 to 120 amps. These are starting points only; settings depend on wire, gas, and machine.

Posts are the hardest heat-management problem, since a post is usually the most massive part of the assembly and is welded to a smaller rail. Plan short welds around it and let it cool between passes. Watch the rail, not the post: the rail moves first, and it is harder to fix than a weld you have not made yet. For solid bar pickets and heavy frames, MMA is attractive: a drag technique with a 3.2 mm or 4.0 mm electrode lays a deep, quiet fillet with far less distortion than a fast MIG bead. The all-position welding rod guide is a good primer on electrode selection and position work.

A Working Sequence That Minimises Distortion

1. Weld the frame flat on the ground or in a jig, then complete the perimeter.
2. Square it, and check the diagonals after every major pass.
3. Build from the middle of each member outward toward the corners.
4. Alternate sides, section by section.
5. Fit the diagonal brace last, to an already square frame.
6. Add pickets last with a temporary spacer bar: tack, check spacing, then weld.
7. Let the frame cool naturally before hanging.

Finally, fume extraction, correct PPE, and proper cylinder storage are non-negotiable. The OSHA welding, cutting, and brazing guidance and the NIOSH welding health topic page cover the exposure risks, and galvanised or coated steel needs specific attention because the zinc fume released while welding is a genuine health hazard.

Common Mistakes, Challenges, and Troubleshooting

Gate failures are quiet. A leaf racks one way under a hand push, a corner sits a quarter inch off the ground after two rainy seasons, a brace pops its weld at the first hard gust. Nearly every long-term failure in iron gate welding traces to a handful of repeatable mistakes, and catching them on the bench is far cheaper than fixing them on the fence.

The Unbraced Frame: The Most Expensive Omission

A plain rectangle looks complete, so it is easy to hang and call it done. But a rectangle is a mechanism, not a structure: push the latch stile and it folds like a book. That is racking, and racking is why gates get out of square. One diagonal brace turns it into a rigid triangle, the same principle that dominates steel frame design. The trap is direction: run the brace on the tension side, from the bottom of the hinge-side stile to the top of the latch-side stile, or the reverse. A compression diagonal can buckle like a stick when loaded. Backwards, the gate works on day one, then ripples across the free rail when someone leans on it. On a double-leaf gate, each leaf needs its own mirrored diagonal, since one full-width brace gives you a rigid leaf and a floppy one.

Cutting Rails and Stiles to the Wrong Length

The classic error is cutting members one at a time against a single reference dimension instead of allowing for material lost at each joint. In 1.5 inch square tubing, a 36 inch finished width does not mean 36 inch rails: each rail welds outside the stiles, so stile widths, the groove, and any brace overlap eat into the picture. Cut 36 and the finished gate lands 3 to 4 inches wider than the opening, so it never closes.

• Mark every member on a flat layout table with a scribe or soapstone.
• Allow for adjoining member width at each joint, not just the centerline.
• Cut one test piece, check the fit, then cut and label the batch.
• Measure both diagonals after tacking; cut tube ends are not perfectly square and each joint takes weld metal that shrinks.

Burn-Through on Thin-Wall Tube

Burn-through is the most likely weld defect on gate work, and it clusters in one predictable spot: the tight corner where two thin-wall members meet. The corner concentrates heat and the wall is thin. Two habits cause nearly all of it: too much heat (excess amperage, fast wire feed, long dwell in one spot) and a continuous pass around the corner without breaks. Heat soaks in faster than filler can fill it, so the wall melts from the back before the puddle is protected.

• Drop amperage and slow the travel speed; thin wall wants a cooler arc and a slower hand.
• Break the corner into short segments, roughly an inch at a time, letting each solidify.
• Tack first to confirm geometry, then weld out, holding a consistent torch angle.
• Put a helper or heat-sink copper behind the joint when a corner refuses to cooperate.

Burn-through on a decorative gate is cosmetic; on a load-bearing frame member it is structural. Patching one after the fact is a bigger job than preventing it.

Over-Welding: The Invisible Problem

More weld is not more strength. Every extra pass adds heat, and heat means distortion, shrinkage, and residual stress, so a leaf welded six times over never sits flat on its hinges. The tell is good-looking welds, a frame within a few millimeters of square, and a leaf that still binds because the twist sits in the members, not the overall dimensions. Two habits make it worse: welding a joint repeatedly to fill an apparent gap instead of fitting it first, and running a heavy bead over a joint that only needed a light fillet. Weld for the joint, not the appearance, and grind a decorative bead flush instead of adding pass after pass.

Post Setting Errors

Common errors are wrong post spacing, which leaves the gate physically too wide for the opening, and posts set at different heights or angles, so the latch never lines up. Hardware matters too: hinge leaves are not self-centering, and if the hinge stile sits a quarter inch off the plane of the post, the leaf drifts and the latch sits crooked. Set the posts, plumb and level them, and confirm the gate fits the opening before building anything. Embedment is separate: a post set too shallow in loose or fill soil leans, and a leaning post turns a straight gate into a binding one within a season, so concrete the posts and let them cure. The Steel Tube Institute’s guidance on tubular connections is a good reminder that the detail at the post decides how the whole assembly behaves.

The Gate That Binds After Installation

Bind is the most common complaint from people who already hung their gate, so start with the simplest causes.

1. Diagonals. Unequal diagonals mean the frame is out of square, and the fix is a frame job.
2. Debris and clearance. A leaf dragging on gravel, sod, or a concrete lip is not a welding problem. Regrade, raise the bottom rail, or trim a ground post.
3. Hinges. A sagging pin, a bent leaf, or a spacer on the wrong side shifts the gate in its plane. Repacking a hinge often solves it.
4. Latch and strike. A latch binding against the post means the gate hangs slightly out of square or the strike plate is off-center.
5. Hinge stile gap. It should be constant top to bottom; a narrowing gap is a leaf racking in its frame.

Fixing a Racked or Burnt Frame

First, know where your process stands. If a repair touches a structural member of a load-carrying gate, or the contract specifies AWS D1.1/D1.1M qualifications, follow a qualified procedure rather than improvise. A qualified D1 committee-referenced procedure is the difference between a repair that passes inspection and one that gets rejected at final inspection.

For a racked frame on the bench, the fix is mechanical, not welded: loosen the welded joints at one or two points, pull the leaf back into a true rectangle with a come-along or clamp, re-tack, then weld those joints out. Severe distortion is better fixed by adding or repositioning a diagonal than by fighting the twist. For a burn-through, clean the hole, fit a backing plate if the wall is structural, and re-form the joint with a smaller, cooler weld; if the melt went through and deformed it, replace that section rather than patch it.

One more trap: a gate can bind because of material choice, not workmanship. Aluminum or aluminum-clad gate parts need entirely different welding considerations than steel, and mixing dissimilar metals in a gate frame brings galvanic corrosion plus a different set of filler and process rules. That mismatch deserves its own conversation before welding, not after.

None of these mistakes is exotic. Catch them on the bench, and the gate still swings true five years from now.

Safety, Inspection, and Quality Control

A gate can look perfect and still be a liability. Fabrication is only half the job; the rest is safety margin, careful checks, and welds that survive a decade of swinging in the wind.

The Hazards Nobody Sees

Welding produces four categories of hazard, and gates raise the stakes: outdoors, thin-wall tube, near finished surfaces, and sometimes old painted iron.

Fumes and gases. The visible smoke is only the fraction you can see; the real danger is fine metal particulate in the air around the arc. NIOSH treats welding fumes and gases as a serious occupational hazard, and the fix is simple: control the fumes at the source.

Radiation and burns. The arc throws intense ultraviolet and infrared energy. Look at it bare and you get photokeratitis, the condition welders call arc eye. The same energy burns skin instantly, and molten spatter causes second-degree burns you ignore in the moment.

Electrical risk. Arc welding runs at high voltage. Damaged electrode holders, frayed leads, and poor insulation are real hazards where cables get dragged across gravel, stepped on, or pinched by hanging gates.

Fire. OSHA’s welding, cutting, and brazing standards cover fire prevention, ventilation, electrical safety, and protective equipment. Hot slag travels surprising distances, and sparks find dry grass, sawdust, and solvents without trouble.

Personal Protection and Ventilation

Start with the helmet. A shade rating suited to your process, roughly shade 10 to 13 for most steel arc work, protects your eyes from arc light and stray spatter, and safety glasses or a clear lens go underneath because a helmet alone leaves gaps. Leather gauntlet gloves, a flame-resistant jacket, and leather leggings cover exposed skin.

Add a welding cap, hearing protection, and safety-toe leather boots. If you handle cylinders, the Air Gas Welding Supply guide to gases, cylinders, and safety covers the storage and securing rules that keep a falling bottle from shearing off its regulator.

Ventilation comes in three tiers: local exhaust with a fume arm or hood close to the arc, general dilution with air moving across the work area, and worst of all a closed garage corner where carbon monoxide readings peak and headaches follow. Outdoors with a breeze is safest, provided the arc stays out of the wind so shielding gas is not blown off the puddle.

Fire prevention means clearing combustibles, keeping an extinguisher within reach, and posting a fire watch near structures you cannot move. Keep a chipping hammer handy, and use the Airgas Welding Supplies buyer guide for the safety gear and consumables worth keeping on the truck.

Visual Inspection: Your First Line of Acceptance

Visual inspection, or VT, is how most structural welds get accepted, and any competent fabricator can do it. The trick is knowing what to look at, and rejecting rather than explaining away.

What you see	What it means	What to do
Crack in toe or root	Fatigue or poor fit-up	Cut out and re-weld
Underside undercut	Excess heat or travel speed	Grind out and reweld
Rounded, blobby bead	Too much heat, too little travel	Redo with lower amperage
Porosity or wormholes	Contamination, dirty wire	Remove, clean, reweld
Overlap or heavy spatter	Arc wandering, poor technique	Grind clean before painting
Arc strike off the joint	Hard spot that can crack	Grind flush, check cracks

Beyond the bead, inspect the geometry. A fillet weld needs a consistent leg length, a slightly convex face, and no valleys or dips, and it must sit in the corner where the members meet. On a gate, use a straightedge and a string to confirm the leaf is square before the weld cools.

When Codes and Qualified Procedures Matter

Most residential gates fall outside a building code, so quality control becomes the owner’s decision. It changes on a commercial property, a public park, or a site with an engineer or architect involved. When AWS D1.1/D1.1M is specified, expect a written Welding Procedure Specification, welders holding current performance qualifications, and inspection to the applicable acceptance criteria.

Under D1.1, VT is the baseline for most welds, while certain complete joint penetration groove welds in tension need extra nondestructive examination such as ultrasonic or magnetic particle testing. Tubular members add a layer, since T-, Y-, and K-connections behave differently from flat plate work, as the Steel Tube Institute explains.

The honest answer: get a written WPS and a qualified welder whenever the gate carries people, sits over a driveway, is taller than roughly shoulder height where it can be climbed, is on commercial property, or is subject to a contract, permit, or inspection requirement. Otherwise, good fit-up and honest inspection will serve you well. The AISC welding FAQ shows how structural steel welding is handled in practice.

Finally, keep records: date the job, note the filler metal and electrode or wire used, photograph the frame before hanging, and keep the consumable labels. It costs nothing and separates answering a question from guessing at one.

Finishing, Corrosion Protection, and Long-Term Durability

The last arc is not the finish line. What happens next decides whether a gate survives ten winters or three, and the parts that fail first are rarely the middle of a rail. They are the welds, cut edges, sharp corners, and the inside of any hollow section left open.

Start With a Clean Gate: Slag, Spatter, and Sharp Edges

Chip slag off while the metal is still warm enough to move, and knock spatter off the tube. Anything left behind traps moisture and holds paint away from the surface, so the coating bridges a dirty interface and peels. A chipping hammer, needle scaler, flap disc, or angle grinder will do the job; for heavy deposits, see our guide to air arc welding and carbon arc gouging.

Break every sharp edge as well. A grinder burr on a cut end starts a coating failure, because the coating thins over the burr and cracks first. Deburr cut ends and notch the corners slightly. Grinding stainless or coated steel throws fine particles, so use the protection and ventilation OSHA sets for welding and cutting operations, plus fume guidance from NIOSH.

Protect the Weak Points: Welds, Cut Edges, and Corners

These areas carry the least material and the most surface area relative to their mass. A weld toe that starts as a pinhole becomes a rust track within a season. Cut edges of square bar and tube are the classic failure point, because mills leave scale and burrs the coating cannot reach. A zinc-rich touch-up paint on anything dinged during handling or erection is cheap insurance.

Surface Preparation: The Step Most People Skip

Preparation matters as much as the coating system itself: a premium epoxy over mill scale or loose rust will fail anyway, because the coating is only as good as the bond underneath. For hot-dip galvanizing the fabricator handles cleaning, so your job ends at the weld. For paint, aim for a defined cleanliness level: SSPC-SP 10 (near-white blast cleaning) and SSPC-SP 3 (power tool cleaning) are common benchmarks, with SSPC-SP 2 the practical commercial threshold for many gate and frame projects. Without blasting, degrease, clean mechanically with a needle scaler or wire wheel, and add a rust-inhibitive primer. On aluminum the rule is the same: clean it first, as our aluminum cleaner guide explains how aluminum oxides behave.

Priming, Painting, and Powder Coating

Prime and topcoat as a system, not two unrelated products. A zinc-rich epoxy primer over prepared steel is the most protective combination for a gate in a wet climate. Alkyd primers are more forgiving but need a compatible topcoat. A two-pack epoxy or polyurethane topcoat gives the best UV and chemical resistance, which matters on a south-facing gate.

System	Best for	Watch out for
Zinc-rich epoxy + alkyd enamel	General steel gates, good value	Must be topcoated
Epoxy primer + polyurethane topcoat	Heavy-duty, coastal, industrial	Surface prep is critical
Direct-to-metal alkyd	Budget work, mild environments	Needs at least two coats
Powder coat	Colours, RAL finish, tough skin	Needs vent and drain holes

Every enclosed tube needs vent holes so air can escape during the cure, and drain holes so water cannot sit inside the part in service. A vent hole of roughly 3 to 6 mm per metre of enclosed volume is the usual starting point. Seal the openings after the coating cures.

Galvanizing: The Toughest Option, With Rules

Hot-dip galvanizing gives the longest service life of any common system for a fabricated steel gate, measured in decades rather than seasons. The zinc layer, including the iron-zinc alloy phases that form at the weld, protects the steel sacrificially, so a scratch does not become a rust bloom the way it does with paint. It is a foundry process, so the parts must be built to suit it: AWS D1.1/D1.1M requires galvanizing after welding is complete, and any coating damaged afterwards must be repaired with zinc-rich paint or by re-galvanizing per the fabricator’s instructions. AISC’s welding engineering FAQ covers workmanship. Leave drainage and venting clear, avoid trapped cavities, and expect a few days at the plant.

Cap the Tubes and Drain the Footing

Open hollow sections collect water, so cap the posts and top rails and ensure drainage at the footing. That greatly reduces internal corrosion and freeze damage. A welded steel cap plate over a post tube is the permanent fix; a rubber plug is temporary and will split in a hard freeze. A galvanised gate needs galvanised closures and vent holes, not an airtight seal, so the hot-dip process can reach every surface. At ground level, detail the post base with a drain hole, a plate with a gap above the concrete, or a gravel-filled collar so water escapes instead of pooling at the footing. The Steel Tube Institute is a good detail reference. Ice inside a drained gate is heavy enough to drag the leaf across the ground.

Maintenance Is the Real Long-Term Strategy

The best coating system still needs a routine. Wash the gate with mild detergent and fresh water once or twice a year to remove salt and bird deposits, especially in coastal or agricultural areas. Touch up chips immediately with the matching topcoat, check that drain holes are clear, clear leaves from the bottom rail, lubricate hinges and latch hardware, and confirm the gate hangs plumb and swings without scraping. Walk the perimeter with a flashlight after a wet season and look for rust bleed at weld toes, blistering paint, and any section where water is sitting. Small defects found in year two are a five-minute repair; the same defect found in year ten usually means rehanging the gate or rebuilding the frame. Finishing belongs to the welding process, not an afterthought.

Practical Tips, Planning Checklist, and Conclusion

The difference between a gate that looks good on hang-up day and one that still swings freely five years later is decided on the bench, long before the arc is struck. Here is the whole guide condensed into the order you should actually work.

The Iron Gate Welding Checklist

Stage	Do This	Why It Matters
Planning	Measure the opening, confirm swing direction and clearances, mark post centres on the ground before cutting tube.	Nothing wastes more steel than a frame built to the wrong opening.
Materials	Size the section by span and load, not by what is on the rack. Check wall thickness at every joint.	Thin wall burns through and distorts; oversized stock loads the hinge.
Layout	Build the leaf flat on trestles and square it by diagonal measurement.	A frame out of square by a few millimetres stays that way.
Fit-up	Tack opposite corners first, then the other two, then pull the corners together.	Balanced tacks keep the leaf flat and stop it twisting.
Welding	Follow a planned sequence, balance heat, and check squareness after each major weld.	Unbalanced heat is the number one cause of a racked leaf.
Hanging	Set posts plumb, square and braced, fit hardware, then swing the gate through full travel.	Most binding faults come from post and hinge alignment, not hinge quality.
Finishing	Remove spatter, coat, prime, paint, cap open tube ends and keep drainage clear.	Water trapped inside a tube eventually turns a gate into scrap.

Plan the Weld Sequence Before You Strike an Arc

Lay the frame out flat, square it with diagonals, tack opposite corners, add the infill, and weld with heat balancing in mind from first pass to last. Diagonal measurement corner to corner is the only honest check of squareness, because a tape along two edges will tell you what you want to hear. Tacking opposite corners first lets shrinkage happen inside a balanced frame instead of twisting a lopsided one. As rails and pickets go in, alternate between areas so no single corner absorbs all the heat. Stitch weld with pauses between beads on thin wall tube; on solid bar, a steady stringer along one joint is fine.

If you are running stick on site, electrode choice for out-of-position work matters more than most beginners expect, and the all position welding rod guide breaks down the common classifications and where each one earns its keep.

Match Your Procedure and Qualification to the Job

Qualification follows the material and the connection, not the look of the finished bead. For typical HSS gate frames with plate connections, plate-qualified procedures are often applicable, but always verify against the project specification and applicable code. Tubular T-, Y- and K- connections carry their own qualification requirements under AWS D1.1/D1.1M, Structural Welding Code for Steel. As the Steel Tube Institute makes the point clearly, not all tubular connections are welded equal, and connection geometry decides what the procedure must prove. If the gate is part of a permitted structure or contract document, confirm the required procedure and welder qualification with the specifier and the authority having jurisdiction first. The AISC welding FAQ helps separate decorative metalwork from structural work.

Hanging and Final Adjustments

Set the posts before the leaf goes up, because a leaning post will drag a perfect gate. Plumb each post, brace it in two directions, and let the concrete set before loading it. Orient the diagonal so it works in tension as the gate sags: on a gate hinged on the left, it runs from the bottom hinge corner up to the top latch corner, pulling against the droop rather than pushing into it. Leave ground clearance for grass, gravel and debris, fit hardware so the gate can lift slightly without binding, then swing the leaf through its full arc several times by hand. Leave it in a temporary stay so a gust cannot catch it and twist the frame while you finish.

Safety Habits Worth Keeping

Safety is a habit on the bench, not a chapter at the end of the job. The OSHA welding and brazing resources and the NIOSH welding topic pages hammer the same points: fume and gas exposure, ultraviolet and infrared radiation, noise, hot work and electrical hazards. A sensible setup includes a welding helmet at the correct shade, gloves, flame resistant clothing, a leather apron, and eye protection for anyone grinding or chipping nearby. Work outdoors or use local exhaust so fume does not follow you into the shop. Keep cylinders upright and secured, inspect regulators and leads before use, and keep a clear path to an extinguisher with a hot work watch nearby. For one-off outdoor work, the equipment simplicity of stick welding is hard to argue with, and a welding supply and cylinder buyer guide helps match gear to the job instead of the other way around.

Conclusion: What Actually Makes a Gate Last

Five principles carry most of the weight, and they are worth writing down before the job starts:

The strongest iron gate is not the one with the biggest welds. It is the one where correct design, fit-up and bracing mean the welds only do the job they were intended to do. Get those five things right and iron gate welding stops being a gamble. You get a gate that stays square, swings true, and outlives the fence around it.

Frequently Asked Questions

What’s the difference between welding a ‘wrought iron’ gate and a steel gate?

Most modern gates marketed as ‘iron’ are made from mild steel (like A36) rather than true puddled wrought iron. The welding techniques are very similar, but material selection, availability, and corrosion protection differ between them.

Do I need to follow AWS D1.1 to weld a residential backyard gate?

For a strictly residential, non-engineered gate, AWS D1.1 is often not contractually required. However, its principles for fit-up, qualification, and quality control are considered industry best practice and are extremely useful for preventing racking and failure.

Should I use solid bar or hollow square tube for my gate frame?

Hollow square tube (like 1 in. x 1 in. x 1/8 in.) is popular for frames due to its rigidity and weight savings. Solid bar is often used for pickets and decorative elements. The best choice depends on the span, weight, budget, and desired aesthetic.

What’s the most important thing to prevent gate racking?

Triangulation. An unbraced rectangular frame will rack into a parallelogram over time. A properly oriented diagonal brace creates triangles, which resist this movement and transfer load into the gate posts.

How do I avoid burning through thin wall gate tubing?

Use lower heat input, short weld runs, stitch welding, and weld towards the corner from the middle of the tube face rather than going straight into the tight corner. Proper fit-up with tight, consistent joints also helps prevent burn-through.

When does a gate require tubular welding qualification instead of plate qualification?

Under AWS D1.1, tubular T-, Y-, and K- connections (intersecting members where the joint geometry requires navigating around the tubular member) are the cases where tubular qualifications are typically required. Many everyday HSS frame connections, such as base plates and end plates, can be qualified by plate tests.

Why is post setting so important for iron gate welding projects?

The posts take the entire swing load and wind load of the gate. Incorrect depth, lack of embedment below frost line, poor drainage, or setting out of plumb will cause the gate to bind no matter how well the frame is welded.

How can I keep my welded steel gate from rusting?

Clean all welds and cut edges, remove mill scale where possible, use a quality primer, apply a suitable topcoat, cap open tube ends, and ensure proper drainage at posts and footings. Pay extra attention to corners, weld toes, and ground contact areas.

What’s the best welding sequence for a gate frame to stay square?

Build on a flat surface, cut to length with proper miters, assemble and check diagonals, tack opposite corners in a cross pattern, verify squareness, tack infill elements in a balanced sequence, and then complete full welds by jumping between opposite corners to balance heat input.

Is it better to weld hinges to the gate or to the post first?

For most installations, it’s best to fully fabricate and square the gate leaf, hang it temporarily with wedges to set the correct gap, then tack the hinges to the posts while the leaf is in its final position. This ensures proper alignment before final welding of the hinges.