Slag in autogenous orbital welds 316L tubing?
Slag in autogenous orbital welds 316L tubing?
(OP)
A borescope video log of the welds in a 316L sanitary tubing system was sent to a third-party inspector and they have rejected 17 welds due to "slag." Based on my limited understanding of common welding practices, I thought slag was the result of using a filler material or welding dissimilar materials. The welding we use in my industry is normally automatic orbital butt-fusion (GTAW/TIG, no filler). Is slag even possible in this type of weld? If not, what could the inspector be mistaking for slag?





RE: Slag in autogenous orbital welds 316L tubing?
RE: Slag in autogenous orbital welds 316L tubing?
RE: Slag in autogenous orbital welds 316L tubing?
RE: Slag in autogenous orbital welds 316L tubing?
These are usually a result of cleanliness issues with the tubes and/or the purging.
By the way, I would like a name other than slag for this too, but it what is commonly used.
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RE: Slag in autogenous orbital welds 316L tubing?
The beads of glass had a very similar chemical composition to beads formed by trying to weld a high silicon material.
RE: Slag in autogenous orbital welds 316L tubing?
RE: Slag in autogenous orbital welds 316L tubing?
Making the purge exit hole the same size as the inlet and minimizing the gas input after verifying the Quality of purge.
( I was just reviewing these old notes and thought I'd share some of my experiences.)
note: Sugar is very distinctive w/stainless steels.
Make sure that your 3rd party Inspection company is reputable in Sanitary work. (Not new to it)
RE: Slag in autogenous orbital welds 316L tubing?