I'd like help for the following problem: for the first time I tried to weld machined aluminium. I milled two blocks, cleaned them with acetone and a stainless brush, then tried the tig machine. Ka-boom, all I get is black soot everywhere.
I think the problem is that the cutting fluid was not perfectly cleaned away. Is that a likely explanation?
Bonus question: if it's the cutting oil, what is the right procedure to clean it (since acetone obviously did not work)?