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What diameter tungsten you using? 1/16"? Only way I can see it taking 125 amps is if the tungsten is undersize for the thickness metal you're welding and to me it looks like that is the case. It WOULD take more amps to get the same heat transfer as a larger tungsten. I use 3/32 on tube and nearly everything I do now.When doing aluminum head repair I used 1/8".
so did you try Alum yet Yoshi?