Walking the cup is a TIG technique where you rock the ceramic cup back and forth on the workpiece surface while advancing along the joint. Each side-to-side rock lays down a small crescent of weld metal, creating the classic “stacked dimes” appearance that pipe welders are known for. The cup resting on the workpiece maintains constant arc length automatically, freeing you to focus on travel speed and filler addition.
This technique works best on pipe cap passes, groove welds, and any flat or curved surface where the cup can roll. It doesn’t work in tight corners, on thin sheet metal (the cup slides instead of gripping), or in overhead positions without a surface to walk on.
How Walking the Cup Works
The motion is a controlled side-to-side rocking of the torch. The cup edge contacts the base metal on one side of the joint, the torch pivots across the joint, and the cup edge contacts the other side. Each pivot lays down a crescent of weld metal. The overlapping crescents create the stacked-dime pattern.
Step-by-Step Breakdown
- Position the torch so the cup rests on the workpiece surface with the tungsten centered over the joint.
- Tilt the torch slightly to one side so the cup edge contacts the metal on the left (or right) of the joint.
- Pivot the torch across the joint by rocking it to the opposite side. The cup edge lifts on the starting side and contacts on the opposite side.
- Advance the torch slightly forward with each rock. Each pivot should move the torch 1/8" to 3/16" along the joint.
- Dip filler into the leading edge of the puddle during or just after each pivot. The timing creates the consistent bead ripple.
- Repeat the side-to-side motion while advancing along the joint.
The rocking motion should be smooth and rhythmic. Don’t pause at the sides. Don’t lift the cup off the surface. The cup should maintain contact with the workpiece throughout the walk.
The “Tick-Tock” Rhythm
Many welders describe the motion as a clock ticking. Left, right, left, right, with filler added on each tick or every other tick. The pace determines bead width and reinforcement. Faster rocking with more forward advance per rock produces a narrower, flatter bead. Slower rocking with less advance produces a wider, more reinforced bead.
Cup Selection for Walking
The cup must be large enough to rock without the tungsten touching the workpiece, and the rim should be rounded enough to pivot smoothly on the surface.
Cup Size
| Application | Recommended Cup | Notes |
|---|---|---|
| Small pipe (2-4" diameter) | #6-#7 | Smaller cup fits tighter curves |
| Medium pipe (4-8" diameter) | #7-#8 | Most popular walking cup size |
| Large pipe (8"+ diameter) | #8-#10 | Wider cup covers more area per rock |
| Flat plate groove welds | #8-#12 | Larger cup for wider beads |
| Tight access / small joints | #5-#6 | May switch to freehand if too tight |
Cup Shape and Material
Alumina ceramic cups with a rounded or chamfered rim walk more smoothly than cups with sharp, square edges. A sharp edge catches on the base metal surface and jerks the motion.
Fused quartz (clear) cups are popular for walking practice because you can see the tungsten and gas coverage. They’re smoother than alumina and slide more easily on most surfaces.
Ceramic with a narrowed waist (shaped like a cylinder that tapers in the middle) are specifically designed for walking. The narrow waist allows more extreme rock angles without the cup body hitting the workpiece.
Gas Lens for Walking
A gas lens is highly recommended for walking the cup. The extended tungsten stickout that a gas lens allows (up to 3/4") gives the cup more height to work with, allowing wider rocking angles and better visibility of the puddle.
Without a gas lens, the short tungsten stickout (1/4") limits how far you can rock the torch before the tungsten tip approaches the cup rim and loses gas coverage. A gas lens setup with #8-#10 cup is the standard walking-the-cup configuration for pipe. For gas lens details, see the TIG cup size guide.
Where Walking the Cup Excels
Pipe Cap Passes
Walking the cup is the standard technique for pipe cap passes (the final, visible pass on groove welds). The consistent rocking motion produces uniform bead width and appearance around the entire pipe circumference. Most pipe welding codes and inspections evaluate cap pass appearance, making consistency critical.
For root passes, walking the cup is less common because the root gap is too narrow for the cup to rock into. Root passes are typically freehand with a keyhole technique. See TIG welding pipe for root pass details.
Structural Groove Welds
V-groove and U-groove butt joints on plate and structural members benefit from walking the cup for fill and cap passes. The consistent heat input from the rhythmic rocking motion produces uniform fusion across the groove width.
Fillet Welds on Plate
Walking the cup on fillet welds works when the two plates provide a surface for each side of the rock. The cup walks on one plate, pivots across the root, and walks on the other plate. This works well on outside corner joints and T-joints with good access.
When to Freehand Instead
Walking the cup doesn’t work in every situation. Switch to freehand TIG when:
- Inside corners are too tight for the cup to reach the root
- Overhead welding without a flat surface above to walk on
- Thin sheet metal where the cup pressure pushes the material or slides instead of rocking
- Complex 3D geometries with irregular surfaces
- Small parts where the cup is larger than the workpiece
- Root passes on pipe with narrow root openings
- Very high amperage where the cup overheats and cracks from sustained surface contact
Freehand TIG is the fundamental skill. Walking the cup is a technique that builds on freehand ability. Learn freehand first, then add walking the cup as a tool for specific situations.
Practice Drills
Drill 1: Dry Walk on Flat Plate
Without striking an arc, practice the rocking motion on a piece of flat plate. Place the cup on the surface and rock back and forth while advancing along a line. Get the rhythm smooth and the forward advance consistent. This builds muscle memory without wasting gas or consumables.
Drill 2: Autogenous Walk on Plate
Strike an arc on a flat plate and walk the cup without adding filler. Focus on maintaining consistent arc length (the rocking maintains this automatically), even travel speed, and a steady puddle. The bead should show a consistent zigzag fusion pattern.
Drill 3: Walk with Filler on Plate
Add filler rod. Practice coordinating the dip with the rocking motion. Start with one dip per two rocks (dip on every other left-side contact). Once consistent, try one dip per rock for a tighter bead pattern.
Drill 4: Pipe Cap Pass
Set up a piece of 4" or 6" schedule 40 pipe in the 2G position (horizontal pipe, vertical axis). Prep a groove weld or simply practice cap passes over existing welds. Work all the way around the pipe circumference. The position changes from flat to vertical to overhead as you rotate around, requiring you to adjust pedal pressure and filler timing.
Drill 5: 5G Pipe (Horizontal Fixed)
The pipe is horizontal and stationary. You weld around the circumference from top to bottom on each side. This is the standard pipe welding position test. Walking the cup on 5G requires changing your body position while maintaining the rocking rhythm.
Walking the Cup on Different Positions
1G/Flat
The easiest position for walking. Gravity holds the puddle flat and the cup rolls naturally on the surface. Full amperage, normal dip timing.
2G/Horizontal (on Pipe)
The pipe axis is vertical. You walk the cup around the circumference in a horizontal plane. Gravity pulls the puddle downward, so angle the torch slightly uphill (5-10 degrees) to counteract sag. Reduce amperage by about 5% from flat settings.
5G/Horizontal Fixed Pipe
The pipe is horizontal and you weld around it. At the 12 o’clock position, you’re welding flat. At 3 and 9 o’clock, you’re welding vertical. At 6 o’clock, you’re welding overhead. Adjust pedal pressure continuously: highest at 12, lowest at 6. Speed up slightly on the overhead section to keep the puddle from sagging.
6G/45-Degree Fixed Pipe
The pipe is fixed at a 45-degree angle. This is the most difficult position because every point on the circumference is a different combination of flat, vertical, and overhead. Walking the cup on 6G is a high-skill technique. Many welders switch to freehand for portions of the 6G circumference where the cup can’t maintain good surface contact.
Common Walking-the-Cup Mistakes
Lifting the Cup Off the Surface
The whole point of walking is that the cup maintains arc length for you. If you lift the cup, you lose that benefit and the bead becomes inconsistent. Keep the cup in contact with the workpiece throughout the walk.
Inconsistent Forward Advance
Each rock should advance the torch the same distance along the joint. If some rocks advance more than others, the bead has uneven spacing. Practice until the advance per rock is automatic.
Too Wide a Rock
Rocking the torch too far to each side produces a bead that’s too wide with thin edges prone to undercut. The total rock width should match the desired bead width. On a standard pipe cap pass, that’s about 3/8" to 1/2" of total oscillation.
Rushing the Rhythm
Faster isn’t better. A frantic rocking motion produces an inconsistent bead with poor fusion at the toes. Find a comfortable pace that lets the puddle flow and the filler melt completely between dips.
Not Adjusting for Position Changes
On pipe, the heat and gravity conditions change continuously as you move around the circumference. If you use the same amperage and speed at 12 o’clock and 6 o’clock, the overhead section will sag and the flat section will be underbuilt. Modulate the pedal and speed continuously.
Pushing the Cup Instead of Pivoting
Walking the cup is a pivot motion, not a slide. The cup should rock on its edge, not drag across the surface. Dragging scratches the base metal, wears the cup, and produces jerky motion. If the cup slides instead of pivoting, try a larger cup with a rounder rim edge or slightly rougher workpiece surface.