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Old 09-27-2006, 01:57 PM
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green stuff on weld

I've been welding some pipe together for a body rotisserie and noticed several welds had dark green stuff around them. Is this some kind of copper or chromium contamination?

Conditions: Lincoln AC 7018 rods, 5/32", welded with a 'buzz-box' at 175 A, pipes: 1 rusty 2-1/2", 1 new 2", grinder used to clean both where welded.

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