"Walking the Cup" Technique in TIG Welding
RINOJ RAJAN, MIEAust,MEngNZ
MECHANICAL ENGINEER ?? WES ???? ? MOE ???? ? EA-PE ???? ?? QHSE ? INSPECTION ? EXPEDITING ? PROJECT MGMT. ??? CSWIP 3.2 ??? BGAS GRADE 2 ??? FROSIO LEVEL III (COATING) ??? LEAD AUDITOR - API & ISO (QMS ? EMS ? OHSMS)
What is "Walking the Cup"??
??- "Walking the Cup" is a TIG welding technique commonly used in Groove and flat surface welding. This method involves resting the ceramic cup of the torch on the surface being welded and then gently rotating or rolling the cup to guide the torch along the weld joint. It ensures a consistent rate of travel and helps create smooth, high-quality welds.
Two Variations of Walking the Cup
??- Groove Technique: The cup rests inside a groove, like in a fillet weld or a T-joint, allowing for precise control. The handle of the torch is rotated back and forth, with light pressure on the cup, to achieve even progression and uniform welds.
??- Flat Surface Technique: When welding on a flat surface or outside of a pipe, a technique similar to "walking a drum" is used. The cup rolls along the surface, providing a steady, controlled movement.
Why It’s Popular
??- Walking the cup is popular because it eliminates the need to prop your hands or fingers on hot metal, especially useful in pipe welding. It ensures a uniform weld and allows proficient welders to complete jobs quickly with high-quality results.
When Not to Walk the Cup
??- Some applications aren't suitable for walking the cup, such as jobs involving machined parts with smooth finishes, where the ceramic cup can leave unwanted scratches.??
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??- Additionally, when working on small pipes (2 inches and under), freehand techniques are more practical for most welders.
The Freehand Alternative
??- For smaller pipes and intricate welds, freehand welding is preferred. Using a TIG finger as a heat shield allows welders to rest on hot metal without discomfort, making freehand welding more effective in these scenarios.
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