Posted by Stick welding on February 24, 2013 at 10:56:38 from (96.53.210.246):
In Reply to: Re: Aluminum welders posted by jon f mn on February 24, 2013 at 09:42:33:
Ya, I think that's the first question. LoL Was it MIG welded or TIG welded or stick welded? If aluminum gets black around the weld is because it is either dirty and/or contaminated. You use straight argon for MIG or TIG on aluminum and the metal has to be really clean. Sometimes when doing aluminum repairs, especially on cast aluminum, it's not uncommon to have to weld it, grind it out and weld it again to get rid of all the dirt/contamination. A contaminated tungsten can cause problems too. MIG requires a push technique. A stainless steel brush can be used but it has to be a new brush only used on aluminum. If it was used on any steel will pick up carbon and contaminate the aluminum.
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