Dear Friends ,
We had the same problem for tig (gtaw) , as we realised that all black spots were small slag zones , the solution was grinding before pickling will exactly solve your problem if there aren't any other problems or mistakes
Best Regards
>Tahir Bilge Olmez
>International Welding Eng.
>Met. & Mat Eng.
>Verify Europe & Atlantic Marine Survey
>+90 544 6158801
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