| You can determine the alloy a multitude of ways. Annodizing being the easiest...besides your almost gauranteed to working with 6061 if your talking cocker bodies.
Different alloys will take to coloring the anodized layer differently, which is why you would notice the change in color on the filled hole(if you used a different filler). The same series alloy will be near perfect. Its also dependant on how accomplished the welder is. The less sheilding gas/filler rod the less impurities. Also the holes are so small Id like to see if they could be autogenous welds(no filler).
-Jake
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