I think it is bad steel tubing. Mexican steel is really bad about that.
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At 08:06 PM 1/4/04 -0500, atrav wrote:
>I had a cratering problem when welding some steel tubing today, TIG,
>straight polarity, 1/16" thick
>1" square tubing, nothing fancy. But, about 50% of my welds will have at
>least one bubble hole, a
>couple just bubbled and boiled and looked like swiss cheese. The rest of the
>welds were perfect,
>there doesn't seem to be a pattern. I was inside, so no wind either.
>I found using a higher amperage helped (going from about 50 to 65amps), but
>it only lessoned the
>problem.
>What could be causing this, bad tubing, bad gas, or...?
>
>-Aron-
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