Sometimes you just have to appreciate the ingenuity some of the big name welders and the technology they offer. If it's more of an adventure to ya then I hope you find what you're looking for. I welded structural steel so never needed to use ac much. All I know when welding aluminum is, if you think it's clean, it's not, you need to clean it more.
Your freq range, how much dcen being put into work piece and waveform being used all play a huge role in how well you can weld a part up. When I first learned we used a ideal arc 400 it worked wonders on sheet metal but old boats, vehicle rims and such you had preheat to draw dirty up wire brush acetone then cool and repeat alot but just being able change waveforms will aid you greatly on a dirty party. Hz frequencies selection is a huge side of you don't have waveform option and if neither of those options a ac balance is recommended and you can get fair cleaning action from ac balance. Aluminum is much more forgiveness then websites suggest.
I have welded an aluminum can back together! I did a lot of 4130 thin wall spaceframe welding too so I was at home at 20 amps using the ck pencil tig torch. I will make a note of your comment. I will be in the market for a syncrowave 250 whenever I can get the time to run the outlet for it.
Aluminum cans aren't easy to accomplish to you'll do fine in real world applications like fixing vehicle components of worn out shit lol. Last place I worked before going to cdl driving so my shoulder hurt less was a huge aluminum repair shop and welded dirty ass trucks outdoors or cattle trailers with ease using syncrowaves. I will say the welders did have some great feature control much more then I ever had in shops and shipyards prior to this last shop. A good ac machine will do all the work for you and machine ment for dc tig but does ac tig will work you to death
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