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White layer on edges of tig welded aluminum

White layer on edges of tig welded aluminum

White layer on edges of tig welded aluminum

I'm curious to know what some people call a condition i'm seeing on aluminum tig welds. I see a sort of cracking in the white around aluminum tig welds. Is this considered crazing? This is in process weld inspection using FPI to find the indications. I was told by a former level 3 that it was not detrimental to the part but my current level 3 says to reject all of it. It all seems to be above the parent material.

RE: White layer on edges of tig welded aluminum

Aluminum is generally welded using alternating current when using GTAW. The benefit of AC is a phenomena call cathodic cleaning that removes the aluminum oxide from the surfaces adjacent to the weld. A couple of minutes with a stiff stainless wire brush after welding (but before performing PT) will remove the majority of the surface conditions causing the penetrant indications you mentioned.

Best regards - Al

RE: White layer on edges of tig welded aluminum

I agree; I think what you are describing is superficial only and can be removed.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

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