just perform whatever NDT needed like MPI and RT to ensure its free of defects and if there is no defect or off set, its can be continued. The most problem can be occurred is cold crack due to heavy wall, weld metal at root pass will cool fast due to its thinner section than parent metal. That why its not recommended to left it without completing the hot pass
From: jesti fer <jesti_fer@yahoo.com>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Tuesday, May 15, 2012 9:25 PM
Subject: [MW:14272] Time between root pass and hot pass
--Dear all,We are doing 20" pipe line project with API 5L Gr.B material as per B31.4, Welding process SMAW (E6010 for root and rest with E 7018, both are up-hill) our welder welded one joint root pass and he kept this joint for long time. But our Qc instructed to cut and re-weld the joint. But the time between root pass and hot pass not mentioned in approved WPS and client specification also.It necessary to cut and re-weld?It is mentioned any were in the code (ASME or API)?Please help me,,Best Regards
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