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It's much easier to tig than I thought and it's damn fun! So far, I've only worked on mild steel. I want to get the hang of that before graduating to stainless or aluminum. I've mostly worked on 1/8 material. Thinner stuff is definitely harder and will take some practice.
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Believe it or not, I've found it's easier to weld stainless and aluminum. Mild steel is very difficult to keep clean. I have experienced much more porosity with mild steel. If you have nice clean steel, it's better. Your welds look really good. Looks like you're ready to move on to Stainless and Aluminum any time to me.
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Does that unit have a high frequency start? I didn't see a pedal or does it have the controls on torch?
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I didn't see a foot control box either. I wondered how you were controlling current?