[MW:1945] RE: 1944] PWHT per B31.1

It depends on your joint configuration, thickness of both basemateials, weld thickness etc.

Not mandatory when both the conditions are met, not just one.

1)      the nominal thickness is ≤19mm

2)      and a min preheat of 95 °C applied, when either of base metal exceeds 25mm

 

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Torkaman
Sent: Tuesday, April 14, 2009 1:38 PM
To: materials-welding@googlegroups.com
Subject: [MW:1944] PWHT

 

Dear All.

Acc. to ASME B31.1 for material's with P No.1 & THK>19 mm, PWHT is required. But when min. preheat 95^oC is applied, PWHT is non mandatory. Is it true?

 

Best regards,

Mehrdad

 

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