TIG Welding Patterns: Weave Types and When to Use Them

A hobbyist welder once spent an entire weekend grinding out a botched aluminum repair because his wide, sluggish weave washed out the edges of a thin corner joint. The arc settings were fine and the tungsten was sharp — the real problem was his hand motion. The pattern you move your torch in decides your bead width, penetration, heat input, and whether you grind or admire the finished weld.

What Are TIG Welding Patterns, and Why Do They Matter?

A hobbyist welder once spent a weekend grinding out a botched aluminum repair because his wide, sluggish weave washed out the edges of a thin corner joint. The arc settings were fine and the tungsten was sharp. The real problem was his hand motion. In TIG welding, the pattern you move your torch in decides bead width, penetration, heat input, and whether you grind the weld out or admire it.

That story is more common than most welders admit, and it points to what separates competent TIG work from gorgeous TIG work: hand motion is a procedure, not a flourish. This guide breaks down every pattern you need to know and, more importantly, when each one earns its place in the puddle.

TIG Welding, Precisely Defined

TIG stands for Tungsten Inert Gas welding. The American Welding Society uses the formal name GTAW, or Gas Tungsten Arc Welding: a non-consumable tungsten electrode creates the arc, an inert shielding gas (usually argon or an argon mix) protects the molten puddle, and a separately fed filler rod is dipped into the pool by hand.

Unlike MIG or stick welding, where the electrode itself melts and masks fine control, GTAW puts the arc and the filler metal under separate, deliberate control. That separation is exactly why TIG welding patterns matter so much: with the puddle essentially governed by your wrist, the motion you choose becomes the single biggest shaping tool you have.

So What Exactly Is a “Pattern”?

A welding pattern is the deliberate, repeatable path your torch tip traces as it moves along the joint. It controls how arc heat is distributed across the width of the puddle, how long the arc dwells at each edge (called the toe), and therefore how the finished bead looks and how deeply it fuses.

There are two broad families of motion:

• Stringer beads — a straight, forward-moving travel path with essentially no side-to-side motion. The torch just advances along the joint, sometimes with a slight push or drag angle and a gentle pulse or dip rhythm for filler.
• Weaves — a side-to-side or looping motion layered across the joint while the torch advances. Weaves spread the puddle wider and let you tie in both edges of a joint in a single pass.

The specific named patterns covered in this article are the stringer, crescent (or U) weave, zigzag, figure-8, circular or looping, triangular, J-weave (including the upward reverse variants used in vertical welding), and the pipe welder’s favorite, walking the cup.

The Principal Question, Answered Early

Which TIG welding pattern should you use? The honest answer is: the narrowest one that still gives you proper tie-in at both toes, chosen for your joint type, position, and material thickness. Stringers are the default. Weaves are a tool for specific situations — wide joints, capping passes, positional work where the puddle needs mechanical support — not a way to make a bead look impressive.

Why Pattern Choice Is a Procedural Variable, Not a Style Preference

This is the part many self-taught welders miss. In professional work, your motion is documented. A Welding Procedure Specification (WPS) — the document that governs qualified welding under codes such as ASME Section IX or AWS D1.1 — specifies parameters like travel speed, bead width, pass technique, and heat input. Change the motion enough to change those numbers and you can be outside your qualified range, which means the weld technically isn’t covered by the procedure.

AWS D1.1 discussion threads, including this forum exchange on weave width limits, describe code provisions that restrict weave bead width to roughly three times the electrode diameter, with tighter limits for stringers. The reasoning is metallurgical, not aesthetic: wider weaves mean more heat per inch, longer arc time, and a larger heat-affected zone.

Your Roadmap Through This Article

We start with the physics — why dwell time, heat input, and cooling rate make pattern choice consequential at the metallurgical level. Then comes the stringer-versus-weave debate, followed by a detailed walkthrough of each essential pattern. After that: walking the cup, a decision framework for matching patterns to joints and positions, a troubleshooting table of common pattern mistakes, a practice progression with drills and starting machine settings, and a look at safety, codes, and advanced techniques like pulsed TIG and automated weaving.

By the end, you’ll be able to look at a joint, pick a pattern for a defensible reason, and diagnose a bad bead by reading its ripples — the same skill that turns a weekend of grinding into a few minutes of confident welding.

Why Hand Motion Matters: Arc Physics, Heat Input, and Bead Shape

An electric arc has no intentions. It converts electrical energy into a plasma column and dumps heat into whatever metal sits underneath it for exactly as long as you keep it there. Amperage sets the intensity of that heat source. Your hand sets how it gets distributed. That is why two welders running identical machines, tungsten, and filler on the same joint can produce completely different results: one dragged a fast, tight stringer and got a narrow, deep bead; the other floated a wide, sluggish weave and got a fat, shallow, washed-out one. In GTAW, where the arc is open and stable, hand motion is the most influential variable you control in real time.

Dwell Time at the Toes: Where Undercut Is Born

Every weld pool has toes, the points where molten metal wets against cold base metal. Fusion at the toes depends almost entirely on dwell time: how long the arc lingers over each spot as you move.

Too little dwell and the base metal never reaches wetting temperature. The filler rides over the surface without biting in, producing cold lap or lack of fusion at the edges. Too much dwell and the opposite failure appears. The arc melts a groove into the parent metal, the fluid pool pulls away from that groove under surface tension, and because no filler arrives to fill it, a sharp notch is left behind. That notch is undercut, the classic defect of a wide, slow weave.

The correction is rhythm, not speed alone. At each end of the weave you pause just long enough to establish fusion, dab filler to replace the metal the arc has opened up, and move on. As a practical cue, your wire should touch the joint at the edges more often than in the middle, where the pool is already supported by the previous pass.

How Heat Input Is Calculated

Heat input quantifies the energy delivered per unit length of weld. For arc processes it is calculated as:

Look at what sits in that denominator: travel speed. Slow the torch down and heat input rises directly, even if you never touch the amperage dial. This is the mechanism most beginners miss: weaving increases arc exposure time per unit length of joint. A stringer bead travels roughly the length of the joint. A zigzag or crescent weave makes the torch trace a longer path, side to side as well as forward, so the arc spends more seconds per inch of weld. At the same 120 amps, a wide slow weave can deliver substantially more total energy into the plate than a quick stringer.

Motion variable	Effect on heat input	What you see on the bead
Slower travel speed	Increases it directly	Wider, flatter bead; heavier tint on stainless
Wider weave at same speed	Increases arc time per inch	Broad cap, wider heat-affected zone
Longer pause at the toes	Local spike at that spot	Undercut or a crater if filler is skipped
Tighter weave, faster cadence	Reduces total input	Narrower bead, deeper proportional penetration

Peak Temperature, Cooling Rate, and the Heat-Affected Zone

Beyond the fusion zone lies the heat-affected zone (HAZ): base metal heated enough to change microstructurally but not enough to melt. Its width and severity track heat input closely. A fast stringer concentrates heat into a narrow band; a wide weave spreads it across a broader area and holds that area above transformation temperature longer, slowing the cooling rate through the critical 800–500°C range that metallurgists use to characterize thermal cycles.

Peer-reviewed GTAW studies, including work on austenitic stainless steels and high-strength low-alloy steels, consistently document that varying heat input produces measurable shifts in weld metal microstructure, hardness, and tensile properties. The general pattern: lower heat input refines grain structure and tends to preserve toughness, while higher heat input coarsens grains, widens the HAZ, and can reduce toughness in susceptible steels. In stainless, extended high-heat dwell also broadens the temperature range in which chromium carbides can precipitate, the root of sensitization and sugaring. That is precisely why aerospace TIG welding procedures tightly specify weave width, travel speed, and interpass temperature rather than leaving motion up to the welder’s taste.

The Penetration–Bead Width Balance

The arc concentrates its energy in a spot roughly the diameter of its cone. A stringer keeps that spot on one line, pass after pass, so each pass re-melts the previous track and drives depth. A weave redistributes the same arc over a wider band, and the trade is predictable: more width, less penetration per pass. Wide weaves also leave a wider HAZ and more distortion, because total heat is spread through a larger volume of base metal.

That does not make weaves wrong. It makes them a tool with a specific job: bridging wide gaps, tying both toes together in a capping pass, or controlling a vertical puddle that would sag if held in one place. Thermal conductivity sets the limits. Aluminum pulls heat away from the arc so aggressively that dwell time matters even more, which is why the same heat-management logic in an aluminum MIG welding guide applies to TIG: a slow weave on thin aluminum can wash the edge out in seconds.

The takeaway is straightforward. Narrow, rhythmic motion concentrates energy for depth. Wide, slow motion spends energy on width. Dwell decides fusion at the edges, or undercut if the filler never arrives. With that model in mind, the stringer-versus-weave comparison in the next section becomes far easier to reason about.

Stringer Beads vs. Weaves: The Foundational Comparison

When it comes to TIG, the biggest split in approach isn’t filler or gas, it’s motion. A stringer bead is a straight or only slightly manipulated pass with minimal side-to-side movement. A weave bead, on the other hand, is a deliberate oscillation from side to side to cover more of the joint. While both can create sound welds, they behave very differently in terms of penetration, heat, and code acceptability.

Penetration, Bead Shape, and Heat

The most defining difference is how energy is concentrated. With minimal manipulation, stringer beads focus the arc and weld pool down the centerline. This produces deeper, narrower penetration relative to bead width. By keeping that concentration, narrower stringer beads generally create a smaller heat-affected zone and lower distortion than a wide weave pass run at the same amperage.

Weaves do the opposite. Each time the arc dwells at the toes of the pool, fusion can be encouraged there, but spreading the arc side-to-side spreads heat over a larger area. This increases the overall heat input into the joint, slows the cooling rate, and expands the heat-affected zone. For many applications, this trade-off is unnecessary, and for heat-sensitive projects such as aluminum boat welding, that extra heat can be especially unforgiving.

Deposition, Pass Count, and Efficiency

Where weaves earn their keep is coverage. A single, controlled weave can cover far more joint area than a thin stringer, reducing the number of passes needed for wide fillets, heavy bevels, or capping passes. This can save time on larger weldments, however, this efficiency comes at the cost of higher heat input per pass. Stringers, by contrast, may require more passes, but allow for more precise control of deposition with less overall distortion.

Code Acceptance and Limits

This trade-off is reflected heavily in procedure qualification. When reviewing provisions within the AWS D1.1 structural welding code, bead-width limits are often cited as a key consideration. A widely referenced guideline is to limit stringer beads to roughly 1–2× the electrode diameter, whilst weave beads are often limited to around 3× the electrode diameter. Many procedures will default to stringers, and will only allow weaves if they are written into a qualified Welding Procedure Specification with those limits adhered to. In short, the procedure, not preference, is usually what dictates acceptability.

When to Choose Which

Factor	Stringer Beads	Weave Beads
Penetration Profile	Deep, narrow, and focused.	Wider, more spread; penetration depends heavily on toe dwell.
Heat-Affected Zone	Smaller at equivalent amperage.	Larger, with increased heat input.
Distortion Risk	Lower, ideal for thinner material or restrained joints.	Higher, especially with wide, slow weaves.
Deposition Rate	Lower per pass, more passes needed.	Higher per pass, fewer passes on wide joints.
Code Acceptance	Preferred by most codes and procedures.	Permitted, but often width-limited and procedure-specific.
Typical Applications	Root passes, thin plate, crack-sensitive joints, and procedure-driven work.	Wide fillets, capping passes, some positional work, or filling large bevels.

Ultimately, stringers are the foundation for a reason. For the vast majority of TIG joints, they offer the best balance of penetration, control, and distortion mitigation. A weave should only be used when it’s genuinely justified, such as filling a wide joint efficiently or building a capping pass, and always within the tight, rhythmic width that your procedure allows. Keep it narrow, keep it controlled, and when in doubt, fall back to the stringer. It will teach you far more about your puddle than any wide oscillation ever will.

The Essential TIG Weave Patterns, One by One

Once your arc length is steady, the shape your hand traces across the joint decides how the bead looks. Six motions cover almost everything you will meet in the shop: the crescent, zigzag, figure-8, circular loop, triangle, and J-weave. The names below follow Paton’s weave pattern guide and ArcCaptain’s weave overview, matching the vocabulary you will hear in the shop.

Crescent (U-Shaped) Weave

You sweep the tungsten in a shallow U or C across the joint, pausing briefly at each toe, then reversing. That pause is the whole point: it gives the filler time to wet in and fuse, while quicker travel through the middle keeps peak temperature from climbing. The result is a wider-than-stringer bead that ties in cleanly at both edges, a staple on fillet and butt joints in the 2G to 4G range. Its limitation is symmetric heat: on thin sheet, trim the toe dwell or the edge will melt away.

Zigzag Weave

Straight lines, sharp reversals, no curve: you step the arc side to side in a saw-tooth path. Because direction changes abruptly, the pool is nudged laterally and the dwell at each side is easy to time. It works well on horizontal fillets and capping passes, giving a modest width increase without much sideways pool drift. Abrupt stops stack filler in the corners, which shows up as cold, high edges or undercut if your dwell is unequal. On aluminum, where the puddle is wide and fluid, a hard zigzag often looks rough; a softer crescent suits it better. Precision work such as aerospace TIG welding favors very tight motions for exactly this reason.

Figure-8 Weave

The figure-8 is a continuous S-motion with no stop at either side. Because the torch loops back through the center on every cycle, filler spreads evenly across a wider joint and the pool stays centered instead of wandering toward one toe. It suits horizontal fillets and wide butt caps, giving even ripple spacing and spreading heat over a longer cycle instead of hammering one spot. The trade-off is room: it needs lateral space, so it behaves badly in narrow grooves or tight corners. Welding Tips and Tricks shows the same motion on fillet caps, and video beats a still photo for copying the rhythm.

Circular / Looping Motion

Small circles, either direction, sometimes widening as the bead grows. Loops keep the arc constantly moving, controlling pool size on thin material while still depositing metal. It is the natural choice for building up pads, surfacing worn areas, and repair build-up. It is also the motion used to rebuild a curb-damaged rim, as our alloy wheel welding guide describes. Its weakness is straight-line control: concentric loops rarely hold the crisp tie-in lines a groove weld wants, so it is a build-up tool more than a groove tool.

Triangular Weave

You trace a triangle with the apex at the root, moving along one toe, across, and down the other, dwelling at each of the three points. Because it addresses two toes plus the center, it is a favorite on outside-corner joints and open-root passes where three surfaces must be tied at once. Used on a root, the base-of-triangle dwell pushes penetration where you want it. The limit is precision: an overlong dwell at that top corner rounds the edge over or burns through thin stock.

J-Weave and Reverse / Upward Variants

The J-weave runs down one side of the groove, curves across the bottom in a J shape, then returns quickly up the other side. The asymmetry is deliberate: the curve holds the pool at the root for penetration while the fast return avoids stacking extra heat. Reverse and upward versions of the crescent and J answer gravity in vertical-up welding: the slow part of the cycle sits on the leading, upper edge so the metal is supported instead of sagging.

Pattern Comparison: What to Reach For

Pattern	Best used for	Watch out for
Crescent (U)	Fillets and butts needing even width	Toe dwell melting thin edges
Zigzag	Horizontal fillets, capping passes	Corners, undercut, rough on aluminum
Figure-8	Wide caps, centering the pool	Needs lateral room; wanders in narrow grooves
Circular loop	Build-up pads, surfacing, thin material	Straight tie-ins hard to hold
Triangle	Outside corners, open roots	Burn-through if corner dwell runs long
J-weave	Groove roots, vertical-up	Asymmetry takes practice to time

Pick the pattern the joint asks for, keep the weave as narrow as the width allows, and let the toes, not the middle, tell you if the timing is right.

Walking the Cup: The Pipe Welder’s Signature TIG Pattern

Ask a pipe welder to show you their favorite TIG motion and odds are they will describe walking the cup. It is the pattern behind the famously even “stack of dimes” ripples on capped pipe joints, and unlike a freehand weave, it does not rely on a rock-steady hand. Instead, the ceramic nozzle becomes a mechanical guide that paces your arc for you.

How the Motion Actually Works

The premise is simple: rest the front edge of the ceramic cup on the bevel face, the root land, or the adjacent pipe surface, then let it act as a pivot point. The tungsten sits at a fixed standoff distance behind that contact point. Rolling the torch handle side to side walks the cup forward in a rhythmic zigzag or figure-eight-ish motion, and because the cup is physically touching the work, your arc length stays constant through every swing. That constancy is the whole trick. With a freehand weave, arc length expands and shrinks with your hand tremor; walking the cup removes that variable, so penetration stays uniform from start to stop.

The roll rate sets your travel speed, and the width of the roll sets your weave width. A welder who keeps the two in a fixed ratio gets identical ripple spacing for the entire pass, which is exactly what inspectors and procedure qualifications look for on code work.

Cup Size Changes the Whole Rhythm

Nozzles are numbered roughly by sixteenths of an inch of orifice, so a #8 cup is about half an inch across and a #12 is closer to three quarters. Bigger cups support a wider, slower, more deliberate weave and deliver a broader shielding envelope; smaller cups fit into tight roots and narrow grooves where a large nozzle physically will not go.

Cup size	Typical weave	Common use
#4–#6	Short, quick steps	Root passes, narrow grooves, small-diameter tube
#8–#10	Moderate, steady rhythm	Fill passes, general pipe and plate fillets
#10–#12 and up	Wide, slow weave	Capping passes on pipe where wide coverage and even ripples matter

Manufacturers such as Lincoln Electric and ESAB publish nozzle and diffuser combinations that balance gas coverage against visibility; a larger cup only helps if the gas flow is tuned down to match, or turbulence will pull air into the shield.

Freehand vs. Cup-Walking

Freehand weaving means the hand alone supports and spaces the torch. It is slower to master but far more versatile: it works overhead, in positional-only access, inside tight fit-ups, and on materials where dragging a cup would smudge a cleaned surface. Welders prepping aluminum joints after using an Aluminum Cleaner for Welding often prefer freehand simply to avoid reintroducing contamination from a dragged nozzle.

Cup-walking trades that versatility for repeatability. As weldingtipsandtricks.com notes in its TIG walkthroughs, the technique is easier to learn than freehand weaving because the cup absorbs your inconsistencies, and it is far less fatiguing over a long weld because the weight rests on the work instead of in your wrist. On long, out-of-position-free runs, that difference is noticeable by the end of a shift. On delicate precision work, welders generally stick with freehand, as covered in our Aerospace TIG Welding overview.

Where It Shines — and Where It Fails

Best applications:

• Pipe and tube root, fill, and cap passes on 2G, 5G, and 6G positions with enough room around the joint
• Long horizontal fillets on plate and structural members
• Capping passes where uniform ripple spacing and consistent travel speed are being judged
• Production work where welder fatigue and bead-to-bead consistency matter

Limitations to respect:

• It needs walking space. If the nozzle cannot roll without hitting a wall, nozzle, or adjacent pass, the technique is unusable.
• Tight fit-ups. Narrow root openings and small lands give the cup nowhere to sit.
• Positional-only access. Overhead and vertical-up joints usually force a freehand or reverse-motion approach — a constraint also faced by welders working through an All Position Welding Rod setup in mixed-position fabrication.
• Cosmetic and sensitive surfaces. A dragged cup scratches stainless and can leave marks on thin or polished work.
• Restricted gas access. On tight joints the cup angle itself can shield poorly, which is why slower weaves demand attention to coverage — an issue discussed in Paton’s weave pattern guide.

The practical takeaway: walking the cup is a situational advantage, not a default. Use it when the joint, position, and procedure permit, fall back to a controlled freehand weave when they do not, and choose the cup size that lets your weave width match the joint rather than the other way around.

Choosing the Right Pattern: Joint Type, Position, and Material

There is no single “best” TIG weave. The right pattern is whichever one the joint, the position, and the metal in front of you actually ask for. A crescent that looks textbook on a stainless butt joint in flat position will sag and fight you overhead, while the tight reverse crescent that saves a vertical-up corner joint is sluggish overkill on a wide aluminum lap. Think of pattern selection as a short decision tree you run in the seconds before you strike the arc, not a style preference you carry from job to job.

Pattern Recommendations by Joint Type

Each joint geometry loads the puddle differently, which narrows the field quickly:

• Butt joints: Run stringer beads on the root and hot pass. On wider fill and cap passes, a narrow crescent or gentle zigzag evens out the layer without piling on heat.
• Fillet and T-joints: Hold the torch roughly 45° into the joint with a 15–20° push angle, as recommended in Miller Welds’ torch-angle guidance. A crescent or figure-8 keeps both toes fused, but your weave width is capped by the leg length you are trying to build and by any code limit on fillet size.
• Lap joints: Use a crescent that spends a touch more time over the plate edge than the sheet edge, since the thinner member melts back faster.
• Outside corner joints: Keep it tight. A stringer or small crescent on thin stock prevents the puddle from pouring off one side and blowing through the corner.

Pattern by Welding Position

Position is often the deciding factor, because gravity never takes a break:

• Flat: Your widest latitude. Crescent, figure-8, zigzag and circular looping all work; pick based on joint width.
• Horizontal: Keep the weave narrow and rhythmic. Anything wide lets the molten top toe run ahead and slump.
• Vertical-up: On thicker plate, welders typically switch to a tight reverse crescent or a small triangular weave. The motion builds a frozen shelf of weld metal that the pool sits on, so it climbs instead of sagging. Amperage also drops compared with flat, since the preheat from the pass below helps.
• Overhead: Demands small, fast stringers or tiny crescents with strict heat control. The pool has to freeze the instant you move off it, so slow wide weaves are off the table. See our All Position Welding Rod Guide for filler choices that freeze quickly in these positions.

Pattern by Material Thickness

Thin material punishes weaving. On sheet under about 1.5 mm (16 ga), run stringers and let travel speed control heat rather than a side-to-side motion. Medium thickness (roughly 3–6 mm) is crescent and figure-8 territory on a properly prepped joint. Heavy section work gives you room for structured triangular or figure-8 weaves across a capped pass, and it is also where precision aerospace TIG procedures start specifying exact weave dimensions rather than leaving motion to the operator’s judgment.

Pattern by Metal Type: How the Puddle Behaves

This is the part beginners overlook. Every alloy has its own puddle viscosity and thermal behavior, and that changes the motion you can get away with.

• Mild steel: Forgiving. The puddle has moderate viscosity and holds its shape, so slow, wider crescents and figure-8s are acceptable as long as total heat input stays reasonable.
• Stainless: The puddle is narrower and wetter than steel, so it tolerates a slow, narrow crescent beautifully. But it does not tolerate excess heat: long dwell and wide weaves extend the time the metal sits in the sensitizing temperature range and can also starve the underside of shielding gas, causing the chalky “sugared” oxide you see inside pipe. Weave narrow, travel consistently, and purge where it matters.
• Aluminum: High thermal conductivity pulls heat away fast, so you run higher amperage, but the puddle is wide, fluid and slippery. That combination calls for tighter, faster motions with an even rhythm rather than slow languid sweeps. Cleanliness matters more than motion choice — fluxless aluminum TIG lives or dies on prep, which our aluminum cleaning guide covers in depth. If you are comparing processes on aluminum, our aluminum MIG welding guide shows how the same joint behaves under a different transfer mode.
• Titanium and zirconium: Extremely sensitive to atmospheric contamination. Stringer beads are strongly preferred; weaving exposes hot weld metal to the trailing edge of the shielding envelope. If you do weave, keep it minimal and keep the gas coverage broad.

Joint / Position	Preferred Pattern	Why
Butt, flat	Stringer or narrow crescent	Even fill without excess heat
Fillet / T, flat	Crescent or figure-8	Balances fusion on both toes
Lap, flat	Crescent biased to plate edge	Prevents edge bite-through
Outside corner, thin	Tight stringer	Controls heat on one edge
Vertical-up, thick	Reverse crescent or triangle	Builds a shelf against gravity
Overhead, any joint	Tiny crescent or stringer	Freezes the pool before it drips

Run through the tree in order: joint sets your torch angle and maximum width, position sets your pattern family, thickness sets your weave scale, and the alloy sets your speed. Once those four line up, the choice stops being a guess and becomes procedure.

Common TIG Pattern Mistakes and How to Fix Them

When it comes to TIG welding, your mistakes are never hidden. Every pause, rush, or uneven swing leaves a signature in the bead. With a little practice reading those marks, you can pinpoint exactly where your pattern went off track. Here are the most common errors, their causes, and how to correct them in real time.

Pattern Problems at a Glance

Symptom	Likely cause	Fix
Undercut grooved along the toes of the weave	Traveling across the joint too fast, or dwelling too briefly at the edges	Slow the crossing, add a deliberate pause and a dab of filler at each toe before reversing
Flat, humped bead with poor tie-in at the edges	Travel speed too slow or amperage too high for the pattern being used	Drop 5–10% amperage or speed up; keep the pool moving as one even band
Wide, washed-out bead that outgrows the joint	Weave wider than the joint allows	Narrow the motion, or drop to a smaller electrode so the weave stays at or under about 2–3× the electrode diameter unless the procedure is qualified for wider beads
Uneven ripple spacing, “fingernail” ripples bunched at one end	Inconsistent reversal rhythm; the hand speeds up mid-weave	Count a steady cadence, or anchor the arc hand and walk the cup for a metronome-like beat
Arc wanders off the toes or creeps up the wall	Arc length changing as the wrist rolls; torch angle not constant	Shorten the arc, rest the cup or a finger, keep torch angle fixed and move from the elbow
Edge dipped or unfused where filler should be	Dabbing only in the middle of the weave and forgetting the edges	Add a filler dab at each extreme of the swing; the arc should sit on the edge while the rod arrives
Gray, crusty “sugaring” or blue/purple tint on stainless	Slow wide weaves extend shielding-gas exposure time per pass, and coverage lapses at the trailing edge	Tighten the weave, increase post-flow and gas coverage, and purge the back side. As noted by TWI, oxidation of the root is the classic stainless GTAW defect
Porosity or pinholes after a pattern change	Contaminated filler, poor preheat cleaning, or the arc blowing off the joint during a wide swing	Clean and re-chamfer, keep the arc tight and on the leading edge. Proper surface prep is especially vital on aluminum, which is why Aluminum Cleaner for Welding: How to Prep Aluminum Right is worth reviewing before blaming your hand
Blown-through or sagging on thin edges	Heat stacking from a slow, wide pattern in one area	Narrow the pattern, add a stitch pause, or back off amperage and let the puddle lead

Of all these issues, an over-wide weave is the most deceptive. Heat spreads laterally with every inch of added swing, creating a larger heat-affected zone, a slower cooling rate, and far more total arc time over a short joint. Both Paton and ArcCaptain recommend keeping your weave between two and three electrode diameters wide unless your welding procedure specification states otherwise. On austenitic stainless and titanium, those extra seconds can quickly break down your shielding gas at the trailing edge, bringing tint or sugaring into the bead.

Field Tips for Reading Your Own Beads

• Start with the toes. If both edges undercut, you crossed the middle too fast or paused too little. If only one does, your torch angle or arc length is biased towards it.
• Check width before heat. Measure against your tungsten diameter. Anything beyond roughly three diameters is a sign to tighten your motion, not slow your hand alone.
• Look at ripple spacing. Even spacing equals an even rhythm. Bunched ripples often point to a hesitation at one end of the swing, usually where you’re dabbing filler.
• Read the color, not just the shape. Straw, blue, or purple hues on stainless are almost always a shielding and speed issue, not a geometry issue.
• Reproduce one variable at a time. Change only amperage, or only weave width, then run the exact same pass. Changing two things at once makes the root cause impossible to trace.
• Film the pass. Even a phone on a tripod will reveal motion faults that are easy to miss while focused under the hood.

For code-driven work where bead width is tightly controlled, precision always outweighs flair. This is especially true in fields like Aerospace TIG Welding: Standards, Techniques, and Training, where written weave limits exist for a reason. Once you can consistently lay a narrow, evenly rippled bead, most of the defects above will fade away. More often than not, the true fix is your rhythm.

Practice Drills, Machine Settings, and a Skill-Building Progression

Patterns are motor skills, not knowledge you read once and own. You learn them the same way you learn a golf swing: slow, repetitive, deliberately imperfect reps with honest feedback after each one. The good news is that TIG practice is cheap. A handful of scrap plate, one filler rod type, and an hour a week will take you further than any amount of gear upgrading.

Set the Machine Before You Strike an Arc

Guessing settings wastes practice time, so start from a number and adjust from there. A common starting point for DC TIG on mild steel is roughly 1 amp per 0.001 inch (0.25 mm) of material thickness, which is the rule of thumb Lincoln Electric and other equipment makers publish in their TIG guidance. From that baseline, back off for position (vertical and overhead run cooler because the pool is fighting gravity and losing heat to the surrounding metal) and add amps when the piece is clamped to a heavy table that acts as a heat sink.

Filler selection matters less than consistency at this stage. ER70S-2 around 1/16 inch (1.6 mm) is a versatile beginner choice for thin-to-mid thickness steel practice because it melts predictably and forgives a slightly fast hand. If you are branching into other consumables, our All Position Welding Rod Guide explains how rod selection changes across positions.

Steel thickness	Starting amps (DC, flat)	Filler	Tungsten
16 ga (1.5 mm)	40–60 A	ER70S-2, 1/16 in	1/16 in, 2% lanthanated
1/8 in (3.2 mm)	70–95 A	ER70S-2, 1/16 in	3/32 in, 2% lanthanated
3/16 in (4.8 mm)	100–140 A	ER70S-2, 3/32 in	3/32 in, 2% lanthanated
1/4 in (6.4 mm)	140–180 A	ER70S-2, 3/32 in	1/8 in, 2% lanthanated

These are starting points, not answers. Miller Welds recommends tuning amperage to the actual joint fit-up, travel speed, and position rather than to a chart alone.

The Four-Stage Pattern Progression

Don’t practice all six weave patterns at once. A sensible progression moves through four stages, each one adding a small amount of difficulty:

1. Straight stringer beads on flat plate, no filler, just arc time and travel speed.
2. Crescent weaves on plate, adding a rhythmic side-to-side motion with even ripples.
3. Figure-8 weaves on plate, then in a fillet joint, which adds pool direction control.
4. Walking the cup on a V-groove plate coupon, then on pipe replicas.

Bead-on-Plate Drills

Run each pattern as a bead-on-plate exercise: a 6-inch line, same amperage, same rod, three times in a row. For stringers, concentrate on one thing only: a consistent 1/8-inch arc length and a steady travel speed. For crescents, count a quiet “one-two-three-four” rhythm as you sweep and try to make every ripple land the same distance apart. For figure-8s, keep the loops symmetrical; asymmetric loops are the usual reason a bead grows wider on one side.

The classic “stack of dimes” exercise is simply the crescent drilled slowly: dip the rod at each edge, pause, move, dip again. Do it with the arc off first to memorize the hand path, then with the arc on.

Walking the Cup Drills

Start on plate, not pipe. Cut a V-groove in 1/4-inch scrap, prop the torch so the ceramic cup rests in the groove, and roll it in a zigzag rhythm without lifting the foot of the cup. Larger cups (#8 through #12) cover more distance per wiggle and smooth out inconsistencies, which is why pipe welders size the cup to the joint. Once the plate coupon looks even, move to open-root pipe coupons in the flat and horizontal positions.

How to Critique Your Own Beads

You cannot fix what you cannot see. Inspect every bead with a 10x magnifier or a jeweler’s loupe, and photograph them in raking light so shadows expose ripple spacing. Film yourself with a phone on a tripod; the footage reveals hesitation, arc-length wander, and rod dips you never feel in the moment. Score each pass against four checks: consistent width, even ripples, no undercut at the toes, and no heat tint beyond straw.

Treat every session as deliberate practice: one variable per drill, a written goal before you start, and an honest critique after. Two focused hours beat a full day of mindless beads. When you are ready to move beyond mild steel, our Aluminum Cleaner for Welding guide covers the prep step that decides whether your aluminum practice beads even have a chance.

Safety, Ventilation, Codes, and Advanced Pattern Techniques

Pattern choice is a safety and compliance question as much as a skill question. The slower and wider you weave, the more arc time you spend per inch of joint, and the more fume, ultraviolet output, and shielding gas you release in your own breathing zone.

PPE and Ventilation: Your Pattern Changes Your Exposure

A stringer bead run at the correct travel speed puts a bounded amount of fume into the air. A sluggish half-inch weave over that same joint keeps the arc burning longer, generates more metal vapor and ozone, and often brings your face closer to the plume, especially in vertical and overhead work where you must look up into the weld. That is why ventilation is not optional: OSHA’s welding, cutting, and brazing standard (29 CFR 1910.252) requires ventilation and fume control measures such as natural ventilation, local exhaust, or mechanical fan-and-hood systems to keep welding fumes within acceptable exposure limits, including in confined spaces.

The health backdrop is serious. NIOSH’s welding topic resources document the respiratory and cancer risks tied to occupational welding exposure, and in 2017 the International Agency for Research on Cancer classified both occupational exposure as a welder and welding fumes as carcinogenic to humans (Group 1). In the shop, that translates into four habits:

• Source capture first. Position a fume extractor hood close to the arc. Long, slow weaves make capture more important, not less.
• Respiratory protection. Where engineering controls cannot hold exposure below the limits, wear a NIOSH-approved, fit-tested respirator.
• Eye and face protection. A helmet with a filter lens suited to your amperage, meeting ANSI Z87.1, is the baseline. Positional weaves mean long stares at the arc, so do not economize on lens quality.
• Body protection. Flame-resistant jacket and sleeves, gauntlets, and a cap or hood. Extended arc time means extended UV exposure on any exposed skin.

Gas Shielding and Cylinder Handling

A TIG weld is only as clean as its shield. Slow weaves extend arc-on time, so gas demand rises and post-flow must stay long enough to cover the hot crater, or you will get sugared stainless and oxidized titanium toes. Watch for drafts, compressed-air lines, and open doors stripping the argon envelope, and check fittings for leaks. Cylinder handling is where shops get careless: secure every cylinder upright, keep caps on when not in use, and use the correct regulator. Buy gases and handling gear from a supplier that documents purity and safety practices; our AllGas Welding Supply: Gases, Services & Safety Guide walks through what to look for, and a reputable Airgas Welding Supplies buying guide helps you compare what actually belongs in your cart when it comes to PPE and consumables.

Code Awareness: When Bead Width Becomes a Compliance Issue

Codes treat pattern as procedure, not personality. AWS standards, including the structural welding code AWS D1.1, set limits on how wide a weave may run in groove welds, because an over-wide bead increases heat input, widens the heat-affected zone, and raises the odds of trapped slag or porosity that a visual inspection will catch. ASME Section IX, meanwhile, qualifies the technique itself: motion, bead width, and the travel speed that governs heat input are tied to the qualified range of your WPS. Production work must stay inside that range, and a deviation can invalidate the qualification. If you weld to aerospace specs, the discipline is stricter still; our Aerospace TIG Welding: Standards, Techniques, and Training piece covers how tightly technique is controlled there.

Advanced Technique 1: Pulsed TIG

Pulsed TIG alternates a peak current that melts and fuses the joint with a lower background current that lets the pool partially solidify. The result is full fusion at a lower average heat input, which is exactly what thin material and out-of-position weaves need: the pool freezes between pulses, so vertical-up crescents and overhead weaves sag less, ripple spacing tightens, and the heat-affected zone shrinks. Manufacturers such as Miller publish pulse-tuning guidance keyed to material and thickness. The trade-off is rhythm discipline; a pulse cycle that fights your natural hand speed produces erratic ripples.

Advanced Technique 2: Automated Weaving and Programmable Profiles

For thick sections, buttering passes, and long production runs, mechanical weaving heads and orbital systems take the pattern out of the operator’s wrist. Programmable profiles, sine, triangular, chevron, and figure-8 paths, hold amplitude, dwell, and travel speed constant for hours, something no human hand sustains. Industry references such as TWI describe where mechanized weaving earns its cost: consistent wide-root fills, cladding, and pipe girth welds where ripple uniformity is inspected. The limitation is access and setup time; short, irregular, or tightly fit-up joints still favor a freehand bead.

Pattern Safety and Compliance Checklist

• Match ventilation to dwell time: the slower the weave, the closer the extraction.
• Confirm helmet, glove, and respirator protection before striking an arc on a positional weave.
• Verify gas flow and post-flow cover the extended arc time of a slow pattern.
• Read the WPS before widening a bead; technique and heat input are qualified variables.
• Use pulsed current to hold fusion while cutting average heat input on thin and out-of-position work.
• Reserve automated weaving for long, repetitive, thick-section joints where consistency pays.

Conclusion: Choosing and Mastering Your TIG Welding Patterns

Ask ten experienced welders which TIG weaving pattern is “the best” and you will get ten different answers, none of them wrong and none of them universal. That is the honest truth at the end of this guide: the pattern is not the point. The point is controlled, repeatable heat placement that fuses both toes of the joint, stays inside the procedure’s heat input limits, and leaves a bead you would not be embarrassed to sign.

The decision logic you have built through this article collapses into four questions you can run in about five seconds before striking an arc:

1. What is the joint? A narrow butt joint rarely needs a weave at all. A wide capping pass or a multi-pass fillet almost always does.
2. What position am I in? Overhead and horizontal work punish wide, hot weaves; vertical-up work rewards a controlled reverse crescent that keeps the puddle from sagging.
3. What metal and thickness is this? Aluminum’s wide, heat-sensitive puddle demands narrow, fast patterns, while stainless’s narrow puddle tolerates more travel but suffers badly from sluggish weaves that ruin gas coverage.
4. What does the procedure allow? Codes and qualified WPSs set the outer boundary. AWS standards such as D1.1 restrict weave width relative to the weld face, and ASME Section IX treats certain weave and technique changes as variables that require requalification.

If you remember nothing else from the whole article, remember this: stringer beads remain the default for code-critical work, and a weave has to earn its place on wide joints, capping passes, and positional fills. When a weave is justified, the best pattern is the narrowest one that still covers the joint and holds fusion at both toes without pushing your heat input out of range.

Key Takeaways at a Glance

Situation	Pattern to Reach For	Watch Out For
Most root and cap passes, code work	Stringer bead	Pressure to “make it look wider” with a slow weave
Filling a wide groove or capping	Narrow crescent or zigzag	Undercut from uneven dwell at the toes
Horizontal and overhead fillets	Tight crescent, triangle, or J-weave	Sagging from excessive puddle volume
Vertical-up fill	Reverse crescent	Letting the puddle outrun the leading edge
Pipe root, fill, and cap; long fillets	Walking the cup	No room to walk in tight fit-ups
Thin material, heat-sensitive alloys	Narrow figure-8, possibly pulsed	Peak temperature climbing with each pass

Build Skill the Deliberate Way

Mastery does not come from learning six patterns; it comes from repeating one until your hands stop thinking about it, then adding the next. Progress in structured welding training follows the same curve as self-teaching: isolate a single variable, run a bead, inspect it, and adjust only one thing on the next pass. Change amperage, weave width, travel speed, arc length, or filler timing one at a time. Change two and you learn nothing.

Inspect every bead. Hold it under a magnifier or a bright light, compare it side by side with your previous attempt, and ask three questions: Are both toes fused? Is the ripple spacing even? Is the bead width consistent from start to stop? Filming your runs with a phone on a cheap tripod is uncomfortable at first and invaluable afterward, because your eyes tell you the motion was smooth and the video shows where it actually wobbled.

Where to Keep Learning

Pattern control is a skill that rewards continued study. Manufacturer training material from Lincoln Electric, Miller Welds, and ESAB covers machine settings and technique adjustments in practical detail, while technical bodies like TWI explain the metallurgy behind what your puddle is doing. For craft-level instruction, Welding Tips and Tricks remains one of the best free resources available.

If your goals run toward certified or specialty work, the pattern discipline you have practiced here carries directly into aerospace TIG welding, where procedures are tight and rework is not an option. The same applies to all-position welding fundamentals, where position determines pattern long before personal preference does.

Start narrow, keep your rhythm honest, justify every weave, and inspect what you just ran. That is the entire discipline of TIG welding patterns, and it is enough to take you from grinding out a botched corner joint to laying beads you are proud to show.

Frequently Asked Questions

What is the best TIG welding pattern for beginners?

Start with straight stringer beads on flat plate, then move to a tight crescent (U) motion. Stringers teach arc length, travel speed, and torch angle without the added complexity of side-to-side timing.

Should you weave when TIG welding?

Only when the joint is too wide for a single stringer or the procedure calls for it — typically on wide fillets, capping passes, and positional fills. Many codes prefer stringer beads and limit weave width to roughly 2–3× the electrode diameter unless qualified otherwise.

How wide can a TIG weave be?

A common working rule keeps weave width at or below about 2–3× the filler or electrode diameter used for the process. AWS D1.1 discussions reference weave bead limits near 3× electrode diameter, but always check the current code edition and your WPS.

What does walking the cup mean in TIG welding?

It is a technique where the ceramic nozzle rests on the workpiece and is rolled side to side in a rhythmic zigzag, keeping the arc length constant. It is widely used on pipe root, fill, and cap passes to produce very uniform beads with less hand fatigue.

Why is my weave bead humped up instead of flat?

A high, narrow bead usually means too much filler, travel speed too slow, or amperage too high for the pattern. Reduce dab frequency slightly, speed up travel, and widen the weave slightly so the puddle can wet out flat.

Why does my weave cause undercut at the edges?

Undercut happens when the arc dwells too briefly at each toe, melting the edge without filling it. Pause a fraction longer at each side and dab filler exactly at the toe to fuse and fill the crater.

What pattern should I use for vertical-up TIG welding?

A tight reverse crescent or small triangular weave works best uphill, giving the puddle time to solidify underneath and preventing sagging. Keep the weave narrow and the amperage moderate, and consider pulsed TIG to control heat.

Does weaving weaken a TIG weld?

A well-executed weave does not inherently weaken a weld, but wide, slow weaves raise heat input, enlarge the heat-affected zone, and increase distortion risk. Follow code and WPS limits, and prefer stringers where possible on critical joints.

Can you walk the cup on aluminum?

Yes, on accessible joints, but aluminum’s wide, fluid puddle and fast heat spread mean you need higher amperage and confident timing. Many welders prefer freehand motion on thin aluminum because the puddle reacts quickly to heat changes.