Please find attached a WPS for a similar welding.
According to my experience for heavy pipes, preheat , clamping time and time between passes can generate cracks, for instance during 4 first passes has not to be any movement of pipeline and time between them has to be short.
Let a joint only with three or four passes for finishing in the next day is take a risk of cracks.
I'm not a native speaker, so pls excuse my english.
Regards
From: nagabhushanam@adorians.com
To: materials-welding@googlegroups.com
Subject: [MW:8400] Cracks in pipe wedling
Date: Sat, 27 Nov 2010 12:34:54 +0530
Dear ,
Please advise me for 34 inch Dia and 20mm thickness pipe of 65X why the cracks are observed while using E 8010G & remedial action.
Regards,
C.Nagabhushanam
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