Re: [MW:10338] Need Advice on PQR for SDSS(UNS 32750)

Dear Vijay

It is also important to check Ferrite Level and it should be arround 40-% , and chemistry of weld you get where Mo should be around 4% Many a times  my observation is ,Difficult to get the impact by SMAW process and We land up by welding GTAW

 

Regards
Hegde P.B.

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From: vijay <vijayakumarme@gmail.com>
To: materials-welding@googlegroups.com
Sent: Mon, 14 March, 2011 11:37:25 AM
Subject: [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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