If both thickness are under 25mm (1"), the PWHT can be exempted if you preheat to 95 C (or 200F) minimum.
If the weldolet exceeds 25mm, you need PWHT at 595 ~ 650C for 1hr/25mm.
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| Feng Lu, Ph.D. | ||
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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Binoy Lonappan
Sent: Tuesday, March 22, 2016 11:11 PM
To: materials-welding
Subject: [MW:24570] Preheating and PWHT for B31.3 CS mtls
Whats the thickness shall be done with PWHT CS material as per B31.3 latest edition .
Here the joint is branch weld of high thickness weldolet with low thickness pipe.
BINOY L
QC
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