[MW:16817] Pitting Corrosion Resistance Failure in DSS

Dear Experts,

We are welded DSS A790 UNS S31803 Pipe to pipe PQR welding and we sent it for Mechanical test. But we found PITTING.

The details are below and i attached the test result also.

Material                         :           A 790 UNS S31803 (Pipe to Pipe)

Size                              :           4" X 8.56mm

Filler Used                     :           ER2209 (Metrode) 2.4mm

Max. Interpass               :           Below 50ºC

Max. Heat Input             :           1.2 KJ/MM

Test Method                  :           ASTM 923 Methode C (22ºC – 24HRS)

Now we are planning to do the PQR again. So please give me you idea to avoid the failure again.

Thanks.

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Regards,

E.Subramanian

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