Anodizing welded sections
I had my first occasion to anodize TIG welded aluminum. I used the proper Lincoln approved filler rod which off the top of my head was 5356. The 6061 of the part anodized perfectly, the weld metal itself anodized perfectly with the same final red colour as the 6061, but the point were the two (I assume) combined turns a bit black, like a shadow following a line beside the weld. If you can imagine a corner weld, the base metal is fine and the weld is fine but there is a shadow along both sides of the weld bead. I did not desmut the part before anodizing.
Has anyone had this experience? Any suggestions?
Sage
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