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Old 12-15-2016, 11:35 PM
tinstructor tinstructor is offline
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Default s/s contamination ?

It looks to me to be lack of sufficient gas shield and/or excessive tungsten stickout.
It's tough to say from the photo.Is that 304/308 or type 316L stainless? And,did you use dissimilar fill rod ?
> Also, if it was welded over a second time,it will carbon precipitate and have carbon inclusions. Overheating will also cause this look.
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