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Re: [MW:32396] Re: Black spots on DSS Weld Joints.

By Materials & Welding
Try cleaning with an SS wire brush .. Followed by cleaning with solvent like acetone .Better to use chloride ( halide ) controlled acetone 

On Mon, 17 May 2021 at 09:15, rajesh...@gmail.com <rajeshreddy32@gmail.com> wrote:
Hi All,

We are also facing the same issue in SDSS welds on 6" Pipe welded with ER2594.

Can anybody let me know the root cause for this spots and remedy. 

On Wednesday, February 12, 2014 at 3:08:50 PM UTC+5:30 Vasantharao wrote:
Dear Experts,

We observe Dark spots on Welding of Duplex Stainless Welds.  

Material is : UNS S31803 ,  Filler Wire for root - ER2594, rest ER2209.

Sample pictures are attached for reference.

Oxygen level in shielding / Purging maintained well below 0.2%.

Interpass <150 Deg.C

Pl. share your valuable information.

Thank you.

P.Rao

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