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Re: [MW:35903] Black Spots on DSS Welding

By Materials & Welding
Dear Mr. Mahmood,

Please advise your welder , before welding, take a piece of emery paper and rub the entire surface of TIG wire then start welding. Please proceed with Pickling and passivation after this.
Joshi Babu
Sr.QCE
98001420  

On Thu, Nov 13, 2025 at 12:52 PM Mahmood Alhinai <mahmood.m.alhinai@gmail.com> wrote:
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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                       Thanks and Regards

JOSHI BABU

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