Monday, March 14, 2011

[MW:10331] Need Advice on PQR for SDSS(UNS 32750)

Dear Friends,

We have conducted PQR(gtaw+smaw) for UNS S32750 SDSS plate of 10mm thickness. 
GTAW filler wire used: Sandwik 25.10.4.L (AWS ER2594 )
SMAW electrode used: Sandvik 25.10.4.LR (AWS E2594-16)

In the Impact test(weld metal) we got only 8~10 joules. The client requirement is min 40Joules @51℃.
But the Impact values for BM and HAZ has more the expected.
We have maintained the interpass temp within 150℃ as per recommendation and the heat input calculated was within 0.5-1.5 KJoules/mm for all the passes.
Shieding for GTAW with Ar+2%N and also back purging was done.
What could be the reason for low value for the Toughness in the weld metal?

Regards,
Vijay

Assistant Manager | QC Department

Hanil Heavy Industries Co., Ltd.

1500-11, Songjeong-Dong, Gangseo-Gu, Busan, 618-270 S.Korea.


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