Hoping for some advice. I tried some TIG welding on my inverter last year and it worked well. However, I've just set it up again in exactly the same way and the welding arc is terrible! The torch, the machine, everything is the same as it was last year. The only new element is the gas, a brand new bottle of argon.


As you can see from my image, the weld is terrible. The arc drifts around, it's noisy and the steel just melts, regardless of how high the amps are. Here's my set up -




  • DC inverter
  • Earth clamp positive
  • Pure Argon around 6 lpm (measured with flow meter)
  • Amps around 100 but I've tried altering it and it's still erratic


Everything is clean, there's no leaks...My gut feeling is that it's the gas as it's the only new element in the set up. I've called the gas supplier and they've never heard of a mix up before.


Any help would be much appreciated as I've wasted 2 days on this.


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