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[MW:35895] Black Spots on DSS Welding

By Materials & Welding

Dear Experts,

Kindly, refer attached photos and clarify what could be the reason of block spots appeared throughout DSS welding surface.

 the welding was carried out as per the approved WPS and approved welder, the DSS filler wire was approved (Bohler / ER2594 / ER2209). Pipe material: A790 UNS 31803
Welding process: GTAW

Thanks & Regards,
Mahmood

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