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Cleaning cast Aluminum?
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Posted by 135 Fan on April 27, 2007 at 21:50:31 from (68.149.46.121):
I've got a question for the TIG welders out there. What is the best cleaner for cast aluminum prior to welding? I've got a fairly intricate piece from the bowling equipment at work that needs to be welded and a new piece is unavailable. It has a kind of brown type grease on it that seems to get in the pores of the metal. It's not the best casting I've seen and I think it isn't the purest aluminum. I used Arcair all clean for aluminum and after wire brushing with a stainless wheel and grinding out a groove with an aluminum disc, I still had to put about 5 beads in to bring all the contamination to the top and grind each one out before I did the next one. Once I got it clean it welded really nice but was really frustrating to try to even get a puddle established to tack it together. I remember a friend that did a lot of aluminum saying there is a special type acid that works really well but he has since moved. Does anyone know what works the best? It would be nice to know for when we get another wierd piece to repair. I'm using a Miller synchowave 250 with the AC balance set almost on maximum cleaning (2) for the initial passes. I've got a couple books that might say but they are in storage. Any recommendations would be appreciated. Yes, even welders need advice on occasion. Thanks in advance. Dave
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