I have a Miller HF 250 that I use for TIG. Steel was no problem. I have been around some very good welders n my time. I had an idea how things went and were supposed to look like. The machine truly does not seem to have a duty cycle. I have around 16 hours time on Aluminum, 2 X 330 cf Argon tanks, assuming 12 hours usage on each tank. I think I am starting to get the hang of Aluminum, but every now and then it seems to kick my butt any time it wants too. Hardest part for me seems to be depth perception and gagging the tungsten. Everything seems to be getting better just not really fast. I don't get to use the TIG everyday and it shows. The best advice I could give a less experienced welder would be, Put the filler in the front of the puddle, and cleanliness is really that important. Hard to wet out the metal through an oily spot. Keep practicing.
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can you learn TIG by yourself on your own???