Most Common Causes
- Tungsten touched filler metal or puddle
- Insufficient shielding gas or poor cup/gas lens setup
- Wrong tungsten prep, diameter, or amperage range
- Contaminated material, filler, or work area
Symptom-first troubleshooting
Troubleshoot contaminated tungsten, arc wandering, dipping, gas coverage, tungsten prep, and TIG cup setup.
Tungsten contamination means the electrode picked up weld metal or dirt. The arc can wander, spit, or become hard to control until the tungsten is cleaned or re-ground.
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Shop tip: check tungsten condition, cup size, gas flow, and torch heat rating before replacing torch hardware.
The most useful nearby paths, kept short for fast scanning.
A TIG cup controls shielding gas coverage around the tungsten and puddle. Cup size and gas lens setup affect coverage, access, and heat tolerance.