----- Original Message -----
From: Karthik
To: materials-welding@googlegroups.com
Sent: Mon, 19 Mar 2012 13:09:19 +0530 (IST)
Subject: Re: [MW:13925] WATER QUENCHING OF S.S. PQR
Hi,
No need to do quenching. Normally interpass temperature for Austenitic Stainless steel will be 170 degrees maximum. You can monitor the Interpass temperature by Infrared thermometer and if it reach nearer to 170 degrees then stop welding and let it cool down and continue welding. we did like this and we found no defect/problem in PQR.
Thanks & Regards,
(Karthik)
Karthikeyan.S
QA/QC Manager
German-Thai Boiler Engineering Cooperation Limited.
Rayong Factory ;
379 Moo.6 Soi 8, Tambol Pananikom,
Nikompattana, Rayong 21180 THAILAND
Tel : +66 38 897 035-9 Ext. 137
Fax : +66 38 897 034
Hand Phone: 0066 892512282
From: CHINTUKUMAR GANDHI <cgandhi1975@yahoo.com>
To: materials-welding@googlegroups.com
Sent: Saturday, March 17, 2012 6:03 PM
Subject: [MW:13910] WATER QUENCHING OF S.S. PQR
| Dear Experts, Is it advisable to water quench the Austenitic S.S. PQR (6 mm. Base Metal Thk., SA 240 Tp. 316L) subsequently after each pass and before proceeding for next pass? Same procedure was followed during PQR of 6 mm. to 10 mm. base metal Thk. SA 240 Tp. 304L PQR to control the inter pass temp. max. 100ยบ C. But, unfortunately, the PQR was failed in IGC test as per ASTM A 262 Pr. E. Intermetallic ditches observed in weld metal, and in H.A.Z. and Parent Metal- Ditch structure observed. Also one root bend was failed in testing. What will be the reason? Which precautions to be taken during qualification of 6 mm. Base Metal Thk., SA 240 Tp. 316L PQR and what will be the qualified max. range of base metal thickness? Please share your experience with me. Thanks & regards, C. R. GANDHI (Welding Engineer) |
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