Yellow stuff on mig beads...

[Ranger1776]

I did some final welding on my bike frame, and i am just curious, what are the small yellow puddles that form on top of mig beads sometimes? i couldn't find anything on other forums about it or just doing a blanket google search... heres a pic of a root with two covers with the yellow puddle phenomenon, these were welded position 2... maybe that has something to do with it, although i get this on position 1 welded as well... Thanks!

 

[Road Angels]

assuming your using gas and not flux wire it would be more than likely that its contamination or impurites, in the wire its self or the surface that you are welding on, mig welding requires a vey clean suface unlike arc witch is so hot that it burns away everything, ut looks like you made two passes, are you using a 115v or a 220v welder, penatration looks to be a little lacking you might try some of the new wire that Lincoln has

 

[FritzTKatt]

That's just a bit of impurities. Don't worry about it, just clean them off with a wire brush. Welds look good and penetration is fine. I'd tie in the end, just hit it with an actual grinding wheel then wire brush it in that area.

 

[superds]

Silica islands. The weld wire has small amounts of silica in it and while welding the silica draws the contaminants with it as it rises to the surface of the puddle. When it cools, it is essentially glass. Easy to knock off with hammer, wire brush, etc.

 

[Mark_88]

Isn't that why they make those pointy little hammers you see on welding stations?

 

[superds]

The pointy hammers are mostly for removing slag from the weld like forms over the weld when stick welding but could also be used for this purpose.

 

[Road Angels]

Hummm My wire must not have sand in it cause I never have that problem but then again I clean every thing till it shines

 

[NEVERLIFT]

Silica islands. The weld wire has small amounts of silica in it and while welding the silica draws the contaminants with it as it rises to the surface of the puddle. When it cools, it is essentially glass. Easy to knock off with hammer, wire brush, etc.

^^^this, nothing to be worried about

 

[superds]

Hummm My wire must not have sand in it cause I never have that problem but then again I clean every thing till it shines

My welds at home don't have these silica islands either but I have seen it fairly regularly in production welding settings. I think a lot of it depends on the wire you use. We use Prostar at work where I've seen them (btw, I'm not a welder at my job).




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