Dear Friend,
So they aren't a continuos, regular defecrs & the appearance of defects are various and very superficial .
I bet it is a mechanical cause.
It is a slight variation in the height of the wire against the wall of pipe during welding caused for ocasionaly ,scraps, small particles, rests of flux or other solids that suddenly are in the base of the trolley that translates the pipes making different the above height.
These aren't the typical pock marks caused for a low ratio of recycled flux in SAW manufactured pipes.
I hope it helps
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