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So what is the main frequency that you wan tto be welding aluminum at if you use a square wave? This is the current design of my welder, If you think u can help me email me so i can send you a picture. 240v-transistors -mot transformers60v-rectifier-filter caps- 200amp shunt- mosfet h bridge-<p>for ...

Please correct me if im wrong because this could be a problem for my welder, but i belive that the high frequency i just for the initial arc from the high voltage to start the main welding arc. I think the reason hf is used so it is slightly safer similar to the way a tesla coil works.

I'm really glad i found this forum. I am making a tig welder of my own and have been doing 2 months of research when ever i get free time from school. For amperage controll and to keep it constant in the desighn of my welder(inverter type) so far basically u want the voltage to increase as the arc g...