Today's mig welder on aluminum works better when you preheat the area to be welded. What I have done is make an acetylene only flame and blacken the area with soot, then open the oxygen and make a neutral flame. Heat the blackened area till the soot is gone, then weld it. The above method works good for tig also.
For tig you need to preheat the area with a torch or else use your tig torch to preheat some. Watch the weld area as it turns fluid and add some filler rod and weld as if you were gas welding. There is a little in technique involved that was not mentioned. I had a female apprentice that was tig welding after I gave her a couple of demos. I have never seen aluminum get hot and make a big hole right away. The weldor would have had to have done something way wrong.
I had the chance to learn oxygen/acetylene welding aluminum many years ago but we had a Tig machine so I passed it up, big mistake.
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