Welding Positions Chart: 1G, 2G, 3G, 4G, 5G & 6G Explained

A first-year apprentice once stared at a WPS that called out a ‘3G uphill’ weld and had no idea whether it meant a groove, a pipe, or a new machine setting. The welding positions chart is the Rosetta Stone of the shop floor and the field — and misreading it can cost a welder a qualification test, a shop a rejected weld, or a project a costly repair.

Why the Welding Positions Chart Matters More Than You Think

A crew fabricating a steel stairway once lost a day to an argument nobody on site could settle. The drawing called for a 2F fillet along the stringer connection. One welder clamped the stringer flat on sawhorses and ran the bead downhand; the other welded it where it sat, with the joint standing vertical. Both were certain they had followed the print. The inspector passed one weld and rejected the other, and the shop spent the next morning on grinders.

Neither welder was incompetent. They simply had no shared language for saying where a weld sits in space. That language is the welding positions chart, and once you read it fluently, an entire layer of shop-floor and field confusion disappears.

What a Welding Position Actually Is

A welding position describes the orientation of the joint, and the weld bead itself, relative to the horizon at the moment the arc is struck. It is not the name of the part, and it is not a machine setting. Gravity is the whole reason the distinction exists: the puddle behaves the same way whether the drawing calls the member a beam, a pipe, or a stringer, and what changes between positions is how hard you fight sagging, penetration, and bead shape.

The four basic plate positions are flat, horizontal, vertical, and overhead, as set out in Miller Welds’ guide to the four basic welding positions. Every other designation you will meet, from 5G to 6GR to ISO’s PF, is a variation built on that foundation.

Why the Chart Exists

Because position sets difficulty, and difficulty decides whether a welder is allowed to make the weld at all. Three standards bodies wrote that logic down:

• AWS D1.1/D1.1M:2025, the current edition of the Structural Welding Code—Steel, defines both procedure and welder qualification, positions included. On US structural work, the positions you qualify on set the production you are permitted to run.
• ISO 6947 provides the international version of the same system using letter codes, PA through PJ, so a drawing issued in Europe or Asia reads exactly like one from an American fab shop. See the standard’s designation tables.
• ASME Section IX carries its own positional numbering for boilers, pressure vessels, and piping, where the position recorded on a performance qualification governs the scope a welder works within.

Those designations then flow into the documents you actually handle: welding procedure specifications (WPS), welder performance qualification records, blueprints, and filler metal data sheets. When a classification advertises an all-position electrode, the manufacturer is making a claim against this same chart. Our all-position welding rod guide explains which rods genuinely hold up where.

Quick-Reference: The Four Basic Plate Positions

Code	Position	How the joint sits	Typical work
1G / 1F	Flat (downhand)	Weld face up, metal deposited from above into the joint	Bench plate, girth welds on a rotated pipe
2G / 2F	Horizontal	Weld axis runs horizontally across an upright or backed face	Groove in a vertical plate, fillet where a horizontal member meets a vertical one
3G / 3F	Vertical	Weld axis runs vertically, uphill or downhill	Column splices, tank shells, stacked plate
4G / 4F	Overhead	Welder works from beneath, weld face pointing down	Overhead fillets, repairs on installed structures

The letter tells you the joint: G is groove (butt, V, bevel) and F is fillet (T and lap joints). Pipe adds 5G for a fixed horizontal pipe and 6G for a fixed pipe inclined at 45 degrees, both of which force the welder through flat, vertical, and overhead in a single pass.

How This Article Walks the Chart

We start by decoding the numbers, letters, and ISO codes so the chart reads like plain English, then work through the four plate positions in detail with work and travel angles, gravity’s role, and typical applications. From there comes fixed versus rotating pipe, the difficulty ranking with the puddle physics behind it, what AWS qualification actually grants you process by process, the defects that show up when a position is misread, and the safety dimension of welding overhead. If formal training is on your roadmap, an aluminium welding course will lean on exactly this vocabulary from day one, and for the field-first case on why stick still dominates out of position, Advantages of Stick Welding makes the argument in full.

How to Read the Welding Positions Chart: Numbers, Letters and Codes

Look at a welding positions chart for the first time and it reads like alphabet soup: 3G uphill, 2F, 6GR, PA, PB, PF. Every one of those codes answers the same two questions. What kind of joint is being welded, a groove or a fillet? And how is the workpiece sitting in space, flat, horizontal, vertical, or overhead? Nail down those two ideas and the whole chart decodes in a couple of seconds.

The First Character: G for Groove, F for Fillet

The letter tells you the joint type. A groove weld is deposited in a prepared groove between two workpiece edges, such as a butt joint, a V-groove, a bevel or a J-prep. A fillet weld joins two pieces set at an angle or perpendicular to each other, like the corner of a T-joint or the edge of a lap joint, with no groove cut into the parts (Miller Welds). That one letter changes the job: a groove weld has to fuse all the way to the root, while a fillet weld is judged on leg length and throat, and gravity pulls on the puddle differently in each.

So 1G is a groove weld made flat, 1F is a fillet weld made flat, and 2F and 2G are the horizontal versions of the same two joints. Same orientation, different joint.

The Numbers: How the Workpiece Sits

The number describes the orientation of the plate or pipe relative to the welder. The four basic plate positions break down like this:

Code	Position	What it looks like
1F / 1G	Flat (downhand)	Work and weld line are horizontal, welding done from above, gravity helping you
2F / 2G	Horizontal	Work is flat, the weld line runs horizontally, often on a vertical face
3F / 3G	Vertical	Seam runs up or down a vertical plate; uphill and downhill are separate skills
4F / 4G	Overhead	You are welding the underside of the joint, puddle hanging above you
5G / 6G	Pipe	Fixed pipe the welder cannot rotate, so one bead passes through flat, vertical and overhead

Those first four are the plate backbone of any all position welding rod chart, and they are the same four words you will see on drawings worldwide: flat, horizontal, vertical, overhead. Numbers 5 and 6 belong to pipe, where 5G means a fixed horizontal axis and 6G adds roughly 45 degrees of inclination to the joint, a detail covered in the pipe section.

The Letter Codes: ISO 6947

North American drawings and AWS D1.1 lean on numbers, but European procedure sheets, ISO 9606 welder qualifications and many international WPSs call positions by letters instead. AWS D1.1 and ISO 6947 describe the same physical joints, so the two systems cross-reference cleanly:

AWS position	Plain English	ISO 6947
1F / 1G	Flat	PA
2F	Horizontal fillet	PB
2G	Horizontal groove	PC
4F	Overhead fillet	PD
4G	Overhead groove	PE
3F / 3G uphill	Vertical up	PF
3F / 3G downhill	Vertical down	PG
5G / 6G (fixed pipe)	Fixed pipe, horizontal or vertical axis	PH, PJ

The pattern is logical once you see it: A is flat, B and C are the horizontal fillet and groove pair, D and E are the overhead pair, F and G split vertical into up and down, and H and J handle fixed pipe. ISO 6947:2019 also defines tolerance windows around each letter, so a weld still counts as flat (PA) if the work slopes up to about 15 degrees or rotates about 30 degrees from level. Those windows are why a joint can be labelled PA on one drawing and “flat” on another with no argument in the shop.

Decoding a Real Callout

Take the apprentice’s problem from the intro: a WPS calling for “3G uphill.” The G means groove joint, the 3 means vertical plate, and uphill means the weld progresses against gravity from the bottom up, which is PF under ISO. Now the same shorthand works in reverse:

• 2F lap joint — horizontal fillet, ISO PB, puddle sitting on a flat face.
• 4G overhead groove — ISO PE, a butt joint welded from underneath.
• 6GR — fixed inclined pipe with a restriction (a ring) at the joint, the toughest field test there is.
• PA root pass — flat groove, ISO’s version of 1G.

One chart, two alphabets, and a single underlying idea: joint type plus work orientation. With that locked in, the next sections can go deep on what each position actually demands of your hands, your heat settings and your consumables.

The Four Basic Plate Welding Positions Explained

For plate work, a welding positions chart boils down to two things: the joint type and the orientation. The letter indicates the weld, with G for groove and F for fillet, while the number indicates the position. From there, everything else, from body position to travel speed, is a response to gravity. In the flat position, welding is performed from the upper side of the joint with the weld face approximately horizontal, which is why gravity works with you (OER Pressbooks, Introduction to Welding). For every position beyond that, you’ll be fighting it to some degree.

1G and 1F: The Flat Position

With 1G, a groove joint lies horizontally, and you’re welding from above. With 1F, a fillet weld is placed on a horizontal surface, most often on a tee or lap joint. The puddle stays stable, penetration is easy to control, and the bead wets out with little manipulation. For fillets, a 45-degree work angle with a travel angle of about 10 to 15 degrees is common. Because of its accessibility, this is the position used for shop splices, tank fabrication, and nearly every training program. It’s also important to know its limits when choosing consumables, which can be compared in our All Position Welding Rod Guide.

2G and 2F: The Horizontal Position

In the horizontal position, the joint runs vertically, but the weld face remains horizontal. 2G has you welding across a vertical groove joint, while 2F has you depositing a fillet on the horizontal leg of a tee or lap joint with the vertical member standing up. Gravity now pulls the puddle downward as you travel sideways. To combat this, use slightly lower current than flat, keep your bead narrow, and aim a 45-degree work angle slightly up toward the vertical plate to help fill the top corner. The two most common issues are undercut on the upper toe and an overweight, sagging bottom leg.

3G and 3F: The Vertical Position

Vertical is a big jump in difficulty. For 3G, both the groove joint and its weld face are vertical. For 3F, a fillet is run up a vertical corner or tee joint. According to Miller Welds, a 90-degree work angle is used for 3G and a 45-degree work angle for 3F, with a slight travel angle pushing the electrode back into the puddle.

The biggest decision here is progression:

• Vertical-up (climbing): The go-to for thicker material. Starting at the bottom and building up provides better root penetration, stronger sidewall fusion, and a solidifying shelf to support the puddle. It is slower, but far more reliable for structural work.
• Vertical-down (gravity): Much faster and runs cooler, making it better suited for thin sections or short-circuit GMAW. However, penetration is shallower, and there’s a higher risk of lack of fusion if moved too quickly. Many procedures restrict downhill to specific electrodes and thin material only.

4G and 4F: The Overhead Position

Overhead is the most physically demanding of the four. With 4G, you’re welding an overhead groove joint, while 4F is an overhead fillet, such as the underside of a stiffener or bracket. Now, gravity is actively pulling molten metal off of the joint, so tight heat control is mandatory. As noted by Welding and Welder, angle your torch or electrode around 45 degrees to help push filler into the joint, use the lowest heat that still achieves fusion, and keep short, rapid passes with a brisk travel speed. Wide weaves tend to hold too much puddle at once and are the most common cause of drips in this position.

Quick Reference: The Four Plate Positions at a Glance

Position	Joint Orientation	Gravity’s Effect	Relative Difficulty
1G / 1F (Flat)	Horizontal, weld from above	Helps the puddle settle	Entry level
2G / 2F (Horizontal)	Vertical joint, weld face horizontal	Pulls puddle down across the seam	Moderate
3G / 3F (Vertical)	Vertical joint and face	Runs along the bead, direction determines fusion	Hard
4G / 4F (Overhead)	Overhead, face downward	Pulls the puddle off of the joint	Hardest physically

The most effective practice ladder is exactly this order from 1 to 4. Master the flat puddle first, as every harder position is simply that same puddle with less help from gravity.

Pipe Welding Positions: 1G, 2G, 5G, 6G and 6GR

Pipe is where the welding positions chart stops being academic. On plate, the joint sits still and you decide how to attack it. On pipe the deciding question is simpler: does the pipe move, or does the welder? That one choice changes puddle behavior, body position, travel speed, and ultimately what your qualification test lets you do on the job.

One clarification trips up apprentices constantly: the “G” in all of these codes means groove, and 3G and 4G are plate-only designations. When a WPS calls out a vertical groove on plate, it means 3G. On pipe you are in the 1G, 2G, 5G or 6G family, where the geometry of the pipe itself is what the code describes.

1G and 2G: Rotating Pipe and the Vertical Axis

1G pipe is the rotating position. The pipe sits on rollers or a positioner and turns steadily while the welder holds a relatively fixed hand position near the top of the joint. Because fresh base metal keeps arriving at the top, gravity behaves almost as it does in a flat plate weld, which is why 1G is the easiest pipe position and the usual choice for shop spool fabrication. The trade-off is scope: a 1G-only qualification says little about your ability in the field, where pipes are already bolted in place.

2G pipe flips the axis vertical, like a column standing on end, with the weld running horizontally around the circumference. Nothing rotates. The welder works a horizontal groove on a curved surface, constantly adjusting work and travel angle as the joint wraps around the pipe. It is the standard configuration for many structural column connections and appears frequently as one half of a combined test such as 2G plus 5G.

Position	Pipe orientation	Weld path	Positions you pass through	Relative difficulty
1G	Horizontal, rotating	Weld stays at the top	Flat only	Lowest
2G	Vertical, fixed	Horizontal around the pipe	Horizontal, with curvature	Moderate
5G	Horizontal, fixed	Around a stationary pipe	Flat, vertical and overhead	High
6G	Fixed at 45° incline	Around an inclined stationary pipe	All of the above, plus angled approach	Highest (6GR higher still)

5G: Three Positions in One Continuous Joint

5G is the position that separates shop welders from field welders. The pipe is horizontal and fixed. Working around it, the welder at 12 o’clock is welding flat, at 3 and 9 o’clock the weld has become vertical, and at 6 o’clock it is fully overhead. The torch or electrode never stops moving around the circumference, so the operator has to transition smoothly between all three plate position techniques inside a single root, fill and cap sequence. As welding training resources explain, this is exactly why fixed pipe is harder than plate: gravity never takes a break, and neither can you.

How position wraps around a fixed pipe is worth memorizing: flat at the top, vertical at the sides, overhead at the bottom. At the top the puddle sits down and rewards a normal drag. At the sides the puddle wants to sag, so you build a small shelf with each pass and favor stringers over wide weaves. At the bottom surface tension is the only thing holding the metal up, which calls for a tighter arc, a smaller puddle, slightly faster travel and disciplined stick-out.

6G and 6GR: The Positions That Open Every Door

6G fixes the pipe at a 45-degree incline and runs the weld around it, typically uphill. The welder now has curved geometry, a fixed joint and a sloped approach all at once, so work and travel angles shift constantly instead of resetting at comfortable waypoints. It is the most demanding standard pipe test and, significantly, AWS D1.1 treats a passed 6G test as qualifying a welder for all production positions, which is why it carries such weight on résumés and in contractor prequalification.

6GR takes 6G and adds a restriction: a partial obstruction or “crotch plate” that blocks clean access to part of the joint. The R stands for restricted, and the test simulates T, Y and K branch connections, where a welder cannot approach the bevel straight on and has limited visibility. Passing 6GR tells an employer you can handle the confined geometry of real headers and tie-in work, not just an open test coupon.

Direction also matters for scope: many pipe procedures are written uphill-only, and a downhill qualifier does not automatically cover uphill production work, or vice versa. Check the WPS before you strike an arc.

Filler matters as much as geometry. Position-sensitive joints are usually rooted with a fast-freeze electrode such as E6010 and filled with a low-hydrogen E7018, though processes vary; our all-position welding rod guide breaks down which consumables hold up when the puddle is fighting gravity. And if stick is your primary process, the reasoning behind its continued dominance in pipe work is covered in Advantages of Stick Welding: Why SMAW Still Wins.

The progression is the same as it has always been: qualify 1G to learn puddle control on a curve, move to 2G for axis awareness, take 5G for a true test of position transitions, and finish with 6G when you want the broadest qualification the chart can hand you. As the fundamentals of position welding show, pipe does not introduce new physics; it simply stacks flat, vertical and overhead into one continuous, unforgiving joint.

Difficulty Ranking: Which Positions Are Hardest and Why

Ask ten welders to rank the positions and you will get the same broad order, because the ranking is physics rather than opinion. The one variable separating an easy coupon from a brutal one is gravity: in flat it pulls the pool into the joint, in overhead it pulls the pool out and onto your hood, arms and floor.

Why Gravity Decides the Difficulty

A weld puddle is liquid metal whose fluidity depends on heat input. With the joint below the arc, surface tension and gravity cooperate: the metal wets the toes and freezes predictably. Tilt the joint so the arc sits beside or above it and the same metal wants to run, so the compensation is a smaller puddle, tighter arc and constant manipulation. That is why fatigue, not technique, breaks people in the harder positions.

The welding positions chart reflects this: flat is the baseline everyone learns first, horizontal adds an asymmetry problem, vertical forces you to stack metal uphill, and overhead inverts the equation.

A Practical Five-Tier Ranking

Tier	Positions	Why it sits here
1 — Easiest	1G, 1F	Puddle rests in the joint; gravity helps, spatter falls away, visibility is best.
2	2F	The lower plate acts as a shelf for the fillet puddle.
3	2G	Horizontal groove: no shelf for the puddle, so it sags toward the bottom toe (Miller Welds).
4	3G, 3F (vertical), 4G, 4F (overhead)	Metal must be stacked uphill, or held overhead while it freezes.
5 — Hardest	5G, 6G, 6GR fixed pipe	All four plate conditions in one continuous weld, with no chance to reposition.

Overhead plate welding (4G and 4F) tops the plate tiers because a drip is a burn hazard and a rejected weld, not a cosmetic defect. Fixed pipe goes further: one bead runs flat, vertical and overhead in a single pass, with no chance to change position without stopping.

Tier 1 and 2: Keep It Simple and Fast

In flat and horizontal fillet work the biggest mistake is overthinking. Use a drag or slight backhand angle, hold a steady travel speed and let the puddle wash to both toes. Slightly faster travel and marginally lower amperage than a heavy groove needs keep the bead flat rather than convex.

Tier 3 and 4: Vertical and the Ropy Bead Problem

Vertical is where technique shows. Run an electrode straight up with no weave and you get a ropy bead that never washes into the edges (Miller Welds). The fix is deliberate manipulation:

• Vertical-up: a slow, tight triangular weave, pausing at each side to let the toes wash in, then flicking through the middle so the centre does not pile up.
• Vertical-down: faster travel, straight stringers, no dwell — practical for thin sheet and downhill pipe roots, but it gives shallower penetration than uphill.
• Heat input: drop 5–10% amperage versus flat, shorten the arc and slow your travel rather than raising current to force the puddle.

Overhead adds one rule: keep the puddle small. Short stitch-like steps, minimal weave and slightly faster travel than vertical keep frozen metal ahead of the pool.

Drag or Push? It Depends on the Process

With SMAW, drag beats push for slag control: pointing the electrode in the direction of travel drags shielding slag behind the arc instead of trapping it under the leading edge, the classic cause of slag inclusions in horizontal grooves. GMAW more often pushes in flat and horizontal, while vertical-up and overhead send most welders back to a drag or near-vertical angle to fight sagging.

Transfer mode matters too: short-circuit puts down a cooler, smaller puddle and is the only practical GMAW mode for overhead and thin vertical work, while spray transfer belongs in flat and horizontal where the puddle can be supported. For consumables, the All Position Welding Rod Guide: Types, Uses & Tips breaks down which electrodes are truly rated for 1G through 4F rather than merely usable in a pinch.

How to Use the Ranking When You Train

Work up the tiers deliberately: spend most early hours in 1G and 1F until the puddle looks identical every pass, then 2F, 2G and vertical-up, treating overhead as the final skill rather than the first ambition. The welding position reference from OpenStax’s welding text and the ISO 6947 position standard are worth reading once you can already run the beads.

Positions, procedures and qualification scope are defined in AWS D1.1, which is the reference we lean on in the next section on welder certification.

Welder Qualification: What the Chart Means for Certification

The welding positions chart is the legal backbone of welder certification. Every welder performance qualification (WPQ) card a welder carries is essentially a translated row from that chart, stating in code exactly which positions on the production floor that person is allowed to weld. Understanding that translation is the difference between a welder who tests once and works everywhere and a welder who keeps retesting for the same shop, job after job.

What a Qualification Test Actually Buys You

Under AWS D1.1, the Structural Welding Code, a welder is qualified by welding a test coupon in a specific position, having it inspected, and then being granted production scope in that position and any positions the code says it covers. The mapping lives in AWS D1.1 Clause 6, Table 6.1, and it is worth memorizing, because the expansions are generous once you know them:

• A CJP groove test in 1G (flat) qualifies the welder for flat groove production only.
• A 2G test qualifies flat and horizontal groove welding.
• A 3G test qualifies vertical groove welding, plus flat and horizontal as derivative positions.
• A 4G test qualifies overhead groove welding, again with flat and horizontal included.

As the OER Pressbooks welding curriculum summarizes it, the higher the test position, the more production positions it unlocks, because passing a harder position demonstrates control in the easier ones.

The 3G + 4G Shortcut: All-Plate Qualification

Most structural shops test welders with a combined 3G + 4G groove coupon. Weld both, pass both, and you are qualified for all plate groove positions: flat, horizontal, vertical, and overhead. The scope widens further with fillet welds. A 3G + 4G groove qualification, when welded with an F-No. 4 low-hydrogen electrode such as an E7018, also covers fillet positions 1F through 4F. One test session can hand a welder an all-plate card, which is why most apprenticeship programs, structural fabricators, and shipyards build their training around it.

Welding consumable classification matters here. If the fillet scope matters to you, make sure your test electrode qualifies under the right F-Number and that it is documented on the WPQ. An all-position welding rod guide is useful background on which electrodes are genuinely all-position capable versus ones that only pretend to be in the hands of a beginner.

Vertical-Up Is Not Vertical-Down

Here is the trap that catches experienced welders. A welder qualified on a 3G uphill coupon is not automatically qualified for 3G downhill. AWS D1.1 treats the progression direction as part of the qualification, because uphill and downhill welding are almost different crafts: different amperage, different travel speed, different puddle control, and different metallurgical outcomes. Vertical-up is the default for critical structural groove welds because of its slower cooling rate and deeper penetration; vertical-down is faster and common in thin-sheet and pipe root passes where distortion control matters. If your production work uses downhill progression, your test coupon must be run downhill.

Pipe: The 6G Advantage

For pipe, the chart’s most powerful single line is 6G plus 4F. According to CWB documentation, that combination qualifies a welder for all plate and pipe positions, which is why pipeline and pressure-vessel employers prize 6G-tested welders. The 6G coupon forces the welder through flat, vertical, and overhead in one fixed inclined joint, and it is qualified without positional rotation, so it transfers broadly. Field qualification reviews, such as those published by the Minnesota DOT for bridge welding, follow the same principle: position scope on paper must match position scope in the field, and inspectors will check.

Staying Qualified: The Six-Month Rule

A WPQ card does not live forever. Guidance from Ohio DOT and AWS-aligned practice notes that qualification is typically maintained by welding in the qualified process and position at least once every six months. Miss that window, and requalification is required. Additional requalification triggers include:

• Changing to a substantially different welding process.
• Using an electrode or filler metal outside the qualified F-Number.
• Employer or code-mandated retests after prolonged inactivity or observed quality failures.

Many larger shops simply run a rolling test calendar so no welder ever lapses, which is far cheaper than a mid-project requalification on a shutdown schedule.

None of this is abstract for specialty work either. Whether you are certified for overhead matters when repairing an alloy wheel, and whether you hold position scope on aluminum matters for aluminum boat hull repair, where out-of-position work is unavoidable. The chart tells a shop what a welder can do; the WPQ card proves it. Learn to read both, and you will never again wonder what “3G uphill” on a WPS actually demands of you.

Positions by Welding Process: SMAW, GMAW, FCAW, GTAW and SAW

Every process has its own comfort zone, and process plus position is what decides whether a weld comes out smooth or saggy. A rod that runs beautifully overhead may be useless at 400 ipm in a flat butt joint, and a spray-transfer MIG setup that lays down perfect horizontal beads will drop a puddle straight through a vertical joint if you don’t change it.

Why Process and Position Belong Together

Positional capability comes from two places: the physics of the arc and puddle, and the manufacturer’s published rating for the consumable. Filler metal data sheets call out which positions a wire or electrode is qualified for, so read them before you load a spool — Miller’s welding basics guide shows how those ratings map onto the 1G–4G system. A consumable rated “flat and horizontal only” will not save you in 3G, no matter how good your technique is.

Process	Typical Positional Range	Position Notes
SMAW (stick)	All positions	Most versatile; E6010 roots, E7018 fills
GMAW (MIG)	All positions with the right transfer mode	Short-circuit for vertical/overhead, spray for flat/horizontal
FCAW	All positions (self-shielded), flat/horizontal (dual-shield common)	Check the reel label for position rating
GTAW (TIG)	All positions	Slow travel makes overhead very controllable
SAW (submerged arc)	Flat and horizontal only	Loose flux cannot hold a puddle out of position

SMAW: The Original All-Position Process

Stick welding earned its place on structural work because one machine and a stinger cover the whole chart. The classic root-and-fill split is E6010 (or E6011 on clean field steel) for the open root, because its deep, forceful arc burns through poor fit-up and runs best downhill, paired with E7018 low-hydrogen for the fill and cap. E7018 is a genuine all-position rod and the standard filler for 3G and 4G structural qualification tests under AWS D1.1, where a low-hydrogen deposit is required for the coupon (AWS D1.1/D1.1M). The trade-off: E7018 runs best on AC or DCEP with a short arc and a slight drag, and it punishes long arcs with porosity overhead. Why stick still wins in tight spots is covered in our advantages of stick welding breakdown.

GMAW: Transfer Mode Decides Your Position

Wire welding is where welders get caught out. Short-circuit transfer deposits small, frequent droplets with low heat, which is exactly what lets a GMAW puddle freeze fast enough to stay put in 3G vertical and 4G overhead. Spray transfer puts down metal efficiently with a smooth, fluid arc, but that fluidity works against you out of position. Both modes still perform well in 2G horizontal groove work on structural steel — short-circuit when thin material or an out-of-position root pass matters, spray when you want deposition rate on heavier plate. Aluminum raises the stakes: transfer mode and heat input matter more because there is no color cue and no flux to hide a bad profile, covered in our aluminum MIG welding guide.

The positional definitions themselves are standardized: ISO 6947 defines the plate and pipe position symbols most of the world uses, while AWS D1.1 defines the qualification scope a welder earns from each test position. Open Educational Resources’ welding chapter is a plain-English reference for how process choice and position interact in practice.

FCAW, GTAW and the Flat-Only Elephant: SAW

Flux-cored arc welding splits into two camps. Self-shielded FCAW is genuinely all-position and thrives in windy field and structural work, while dual-shield (gas-assisted) wire is often rated flat and horizontal only — again, read the data sheet. Our all position welding rod guide has a practical overview of all-position consumables.

GTAW handles every position comfortably because the welder drives the puddle by hand instead of relying on a wire feed; overhead TIG is slow but very predictable, which is why aerospace and pressure work lean on it.

Submerged arc welding is the outlier. SAW buries the arc under a mound of granular flux, and that flux is loose. Out of position, gravity pulls both the flux and the molten puddle down, so SAW is essentially a flat and horizontal process used on plate, beams, tanks and spiral pipe — not a field vertical process. If your drawing calls for 3G or 5G, SAW isn’t on the table.

Common Welding Position Mistakes and How to Fix Them

Every position in the welding positions chart fails in its own characteristic way. Gravity does not cheat; it simply pulls the puddle where it wants, and the defect shows up exactly where you would expect. The good news is that position-related defects are predictable, and once you can name the flaw, the fix is usually straightforward. Here is the troubleshooting breakdown of the mistakes that cost welders test plates and shops rework.

Undercut at the Top Toe in 2G

The horizontal groove weld is where most welders first meet undercut. In 2G, the arc points slightly upward into the top plate while gravity drags the molten metal downward. The result is a groove melted into the top toe of the joint while the bottom toe fills with overlap — weld metal spilling over the lower plate without fusing into it.

The corrective actions are simple and stack together:

• Slow your travel speed at the top of the joint so the puddle has time to wet out and fill the crater before you move on.
• Drop the amperage slightly (about 5–10%) or narrow the weave so the arc does not gouge the upper plate.
• Adjust your work angle — hold the gun or electrode a touch toward the top plate, then finish with a brief pause at the bottom toe to burn off the overlap.
• Use a slight triangular weave, pausing momentarily at each toe so the puddle ties in rather than racing across the middle.

Sagging and Dripping in Vertical and Overhead

If your vertical fillets bulge in the middle or your overhead beads hang down like icicles, your heat input is too high for the orientation. Excessive heat keeps the puddle liquid long enough for gravity to move it. Reduce amperage, shorten the arc length, and slow travel just enough to let the puddle solidify behind you. An all-position welding rod rated for the job helps too, since general-purpose electrodes often freeze too slowly when pointed uphill.

Defect	Typical Position	Likely Cause	Correction
Undercut (top toe)	2G, 3G	Travel too fast, arc too hot, wrong work angle	Slow down, pause at toes, trim amperage
Overlap (bottom toe)	2G, 2F	Gravity pulling puddle, low heat at bottom	Aim slightly down, hold a beat at bottom toe
3D / ropy bead	3G, 5G vertical	Long arc, too much current, erratic travel	Shorten arc, reduce amps, tighten weave rhythm
Sagging fillet	3F, 4F	Excessive heat, large puddle, slow travel	Lower heat, narrow stringers, keep puddle tight
Porosity	Overhead, all-position	Contaminated surface, draft, long arc	Clean thoroughly, shield from drafts, shorten arc
Lack of fusion	Horizontal, overhead	Puddle not reaching joint root	Dwell at toes, verify amps, grind root clean

Porosity and Lack of Fusion Overhead

Overhead is unforgiving because trapped gas and un-fused edges both get worse when the arc is held too far from the work. Keep the arc tight, keep travel speed steady, and never let the puddle grow wider than about three electrode diameters. Cleaning matters more here than anywhere else: slag, mill scale, oil, and moisture all migrate into the puddle when the arc is fighting gravity at the same time.

Interpass temperature and cleaning matter most in multi-pass vertical and overhead welds. Let each pass cool to the range specified in the procedure, chip and wire-brush every layer before the next bead goes down, and check the toes with a good light before burying them under another pass. The same discipline applies when you prep aluminum before any position work — the cleaner the surface, the fewer defects you chase later.

The Test-Plate Mistake

One process error has nothing to do with arc technique: moving the test coupon. AWS D1.1 qualification procedures require the test weld to remain in position until completion once welding starts. Rotating a plate to flat halfway through, propping it differently, or repositioning the fixture invalidates the test regardless of how good the finished bead looks. The same rule applies to requalification paperwork — a technically sound weld performed out of position is still an out-of-spec test. You can confirm current requirements directly in the AWS D1.1 Structural Welding Code.

A Simple Diagnostic Habit

Before blaming the position, run through three checks: arc length, travel speed, and heat setting. Most vertical and overhead defects trace back to one of those three. Shorten the arc, steady your rhythm, and trim the amperage until the puddle stops fighting you — then look at your stick welding settings and technique together, since drag versus push angle changes dramatically as you rotate around the joint. For a broader reference on how defects map to each orientation, this positions, techniques and defect guide is worth a read.

Fix the position-specific flaw first, and the rest of the weld usually falls into line.

Safety in Non-Flat Positions: PPE, Hot Work and Fire Watch

Everything in the welding positions chart is really a story about gravity. Gravity fights your puddle in 3G and 6G, and it also decides where the hazards go. In flat welding, spatter falls away from you and slag drops onto the floor. Overhead, the same physics reverses: hot slag, sparks, and molten droplets land on your arms, your neck, and the top of your helmet. That shift is why safety practice has to change with the position, not just the technique. As a rule, the further a weld moves from 1G, the more your body positioning, protective clothing, ventilation, and hot-work controls matter.

What Actually Falls on You (and Where)

Position changes the exposure pattern more than most welders realize. A quick look at how hazards travel:

Position	Primary hazard direction	Watch for
1G / 1F (flat)	Down and outward	Slag chips rolling off the plate, floor-level fire
2G / 2F (horizontal)	Down and sideways	Spatter falling into boots, hot debris on arms
3G / 3F (vertical)	Down along the joint	Slag running inside gloves, sparks down the collar
4G / 4F (overhead)	Straight down onto the welder	Burning spatter on face and neck, slag in ears
5G / 6G (fixed pipe)	Changes constantly around the pipe	Constant repositioning, overhead at the bottom of the pipe

Fixed pipe is the sneakiest case. On a 5G or 6G coupon you pass through flat, horizontal, vertical, and overhead within a single pass, so your hazard exposure changes as you go. A all position welding rod guide helps you pick filler that behaves across that whole range, but no electrode rating protects you from falling slag. Only clothing and positioning do.

PPE for Vertical and Overhead Work

Overhead welding is the reason old-school leathers still exist. Standard practice for non-flat work includes:

– Full leather jacket or cape and sleeves, buttoned at the collar, so sparks cannot drop inside.
– A welding cap worn under the helmet, plus a neck wrap or balaclava, to close the gap at the back of the head.
– A properly shaded helmet with a tight face seal, and side panels or a shroud if you are welding overhead in a trench or booth.
– Leather gloves with cuff protection, and gauntlets over jacket sleeves rather than tucked in.
– Closed leather boots with a metatarsal guard where hot slag can fall, plus safety glasses with side shields under the helmet at all times.
– Fire-resistant underlayers; cotton treated for FR, never synthetic fleece or rayon that melts against skin.

For structural field work and shipyard environments, these expectations are formalized rather than optional. The OSHA welding, cutting, and brazing safety guidance lays out the protective equipment and administrative controls that apply when the work moves off the bench.

Ventilation: Fumes Follow the Arc

Welding fume rises with the heat plume, which means position changes your breathing zone. Overhead, the plume climbs directly toward your face before roof-level extraction can catch it, and in vertical joints the fume runs up along the plate. Where natural ventilation cannot keep the air clear, use local exhaust or supplied-air respiratory protection, and position yourself so you are never in the fume path. This matters more with coated, galvanized, or alloy steels, where the coating changes the fume chemistry. If you work with coated plate or specialty consumables, review the filler and safety data first, as covered in this guide to alloy steel welding electrodes.

Hot Work: Fire Watch Under OSHA

Non-flat welding usually means field conditions, structural steel, or confined areas where combustibles cannot simply be moved. That is when the fire watch rules kick in:

• OSHA 1910.252 requires a fire watcher whenever combustible materials are within 35 feet (10.7 m) of the hot work. The watcher stays on duty for at least 30 minutes after welding, cutting, or brazing ends. Read the standard.
• OSHA 1915.504 goes further for shipyard work, requiring a written fire watch policy and specific posting of hot-work areas so other trades know welding is in progress. Read the standard.
• The watcher needs an extinguisher, a way to raise the alarm, and a clear view of the weld zone and any adjacent or overhead compartments.

Wet Floors and Shock Protection

Field welding often happens where the floor is wet from washdown, rain, or leakage. Under OSHA 1910.252(a)(2)(iv), arc welding personnel working in wet locations need shock protection: dry platforms, insulating mats, rubber gloves, or a semiautomatic process with an insulated holding device, plus grounding that accounts for the wet surface. Overhead positions compound this because welders end up kneeling in puddles or bracing against damp structure for long periods.

Finally, treat gouging and backgouging as their own hazard class. Air arc work throws a heavy stream of sparks and molten metal well beyond normal arc distance, which is why carbon arc gouging demands its own setup and safety rules. Clear a wider radius, protect anything below, and keep the fire watcher close.

The habit worth building is simple: before you strike an arc above shoulder height, ask where the sparks will land, where the fume will go, and who is watching after you leave.

Practical Tips, Training Path and Conclusion

Knowing the chart is one thing. Building the muscle memory to weld every square of it is another. The good news is that the learning path is well established, and it follows the same logic as the chart itself: start where gravity helps you, then slowly take gravity away.

The Proven Progression Path

Nearly every apprenticeship program and trade school walks students through positions in the same order, because each step adds exactly one new challenge:

1. 1G and 1F (flat). The puddle sits in the joint and stays there. Learn arc length, travel speed and puddle width here without fighting anything else.
2. 2G and 2F (horizontal). Now the puddle wants to sag. You learn to keep the arc slightly ahead of the weld pool and to stack the metal rather than let it slump.
3. 3G and 3F (vertical). Start with vertical-up on groove welds. Vertical-down is faster but far less forgiving on thickness, so most instructors teach it later as a speed skill.
4. 4G and 4F (overhead). The last plate position, and the one that tests your body control as much as your hand control.
5. Pipe: 1G rotating → 5G fixed → 6G. Only after plate is comfortable does fixed-position pipe make sense, because 5G forces you through flat, vertical and overhead in a single pass sequence.

Position Drills That Actually Work

Set aside short, focused practice blocks rather than long, tiring sessions. Some drills that reliably build position skills:

• Bead-on-plate per position: Run a single stringer bead in each of 1F, 2F, 3F and 4F on the same plate size, then compare width, ripple spacing and reinforcement side by side.
• Progression marking: Use a soapstone to mark 1-inch stops along the joint. Force yourself to travel at a fixed speed so you can see exactly where the puddle began to sag.
• No-restart root runs: Practice striking the arc and completing a full joint without stopping. Restarts are where most lack-of-fusion defects hide.
• Mirror-free body bracing: In overhead work, set your stance first, brace both forearms or elbows against something solid, and only then strike the arc. Trying to weld overhead with a free arm is how ropy, uneven beads happen.

Comfort is a technical skill. If your shoulder is shaking at 4F, the weld will show it. Welding in a cramped position is also an ergonomic and safety issue, so reposition the workpiece or your body before you start rather than mid-joint, which is exactly the kind of mid-test mistake that voids a qualification coupon.

Put a Welding Positions Chart on the Wall

This sounds trivial, but it works. AWS publishes a free welding positions reference poster covering 1F through 4G, and keeping it visible in the shop or classroom means nobody has to guess whether a callout means flat groove or horizontal fillet. Pair it with your WPS binder. The three things every welder should verify before striking an arc are the filler electrode’s position rating, the process, and the progression direction (uphill or downhill) specified. Misreading any one of those is a reliable route to a rejected weld or, worse, an unexpected requalification. You can check the governing standard directly through AWS D1.1 and its qualification tables.

If you are still building foundational skills, a structured aluminium welding course is a useful example of how formal programs sequence position training, and the same flat-to-overhead ladder applies no matter which metal you specialize in.

Key Takeaways

The welding positions chart is not academic paperwork. It is the shared language between the engineer who wrote the procedure, the inspector who will accept or reject the weld, and the welder holding the stinger. To recap the essentials:

• Numbers (1–5) describe joint type, letters (G for groove, F for fillet) describe joint geometry, and letters A through H describe orientation.
• Plate runs 1G/1F flat, 2G/2F horizontal, 3G/3F vertical, 4G/4F overhead; pipe adds 5G fixed and 6G inclined, plus 6GR for T/Y/K work.
• Qualification in 3G and 4G unlocks broad production scope under AWS D1.1, while vertical-down tests do not grant the same uphill scope.
• Gravity is the variable that makes every position harder, and heat input, travel speed and puddle manipulation are your tools for managing it.

Learn flat until it is boring, add horizontal until sagging stops surprising you, master vertical-up until your root pass is consistent, then take overhead slowly with your body braced. Read every WPS twice before you strike the arc. Do that, and the chart stops being a test you pass and starts being a map you work from for an entire career.

Frequently Asked Questions

What do the numbers and letters on a welding positions chart mean?

The number identifies the position: 1 = flat, 2 = horizontal, 3 = vertical, 4 = overhead. The letter identifies the weld type: F for fillet and G for groove. So a 2G weld is a groove weld made in the horizontal position.

What is the difference between 3G and 3F?

Both are vertical positions. 3G is a groove weld in a vertical joint, typically qualified uphill on thick plate, while 3F is a vertical fillet weld on a corner or T-joint. The technique is similar, but the joint geometry and puddle support differ.

Which welding position is the hardest?

Overhead (4G/4F) is generally considered the hardest because gravity pulls the molten puddle downward, risking drips and sagging. Fixed pipe positions like 5G and 6G are also demanding because the welder passes through flat, vertical, and overhead in a single joint.

Does a 3G test qualify me for other positions?

Under AWS D1.1, a 3G groove test qualifies a welder for production welding in the 1G, 2G and 3G flat/horizontal/vertical plate positions. Adding a 4G test covers overhead and effectively clears you for all plate groove positions.

What does 6G mean in pipe welding?

6G means the pipe is fixed at a 45-degree incline and cannot be rotated during welding. Because the welder works through changing orientations, passing a 6G test qualifies for all pipe positions under AWS D1.1, making it the most widely accepted pipe qualification test.

Vertical up or vertical down — which should I use?

Vertical-up gives better penetration and fusion and is the standard for structural groove welds on thicker material. Vertical-down is faster and useful on thin material or certain GMAW short-circuit applications, but note that a 3G-uphill qualification does not automatically cover downhill welding.

How does the welding position affect my welding parameters?

Non-flat positions usually require lower heat input. Vertical and overhead welds generally call for reduced amperage, a shorter arc, and slower, controlled travel with puddle manipulation so the weld washes into both toes without sagging.

Are ISO position codes the same as AWS codes?

No. ISO 6947 uses letter designations: PA (flat), PB (horizontal-vertical fillet), PC (horizontal), PD (horizontal-overhead), PE (overhead), PF (vertical up), and PG (vertical down). Fixed pipe positions use PH, PJ, and slope/rotation notation such as PH-L045 for 6G uphill.