According to ASME IX, QW-406.3, when the Preheat is a supplementary essential variable, an increase of more than 55 degC in the max Interpass temperature requires requalification.
I would suggest you read carefully QW 406.1 to 406.3
Dr. G. Dilintas - Authorized Inspector Supervisor
I&F Regional Technical Manager
Bureau Veritas Piraeus - Greece
Tel: +30 210 40 63 113/4
Fax: +30 210 40 63 118
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limesh M <limesh78@gmail.com>
Sent by: materials-welding@googlegroups.com 14/09/2010 15:43
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Dear All,
Design Code: ASME B31.3 Welding Code: ASME SEC IX
I have a Low temperature carbon steel impact tested PQR with a PWHT range of 600⁰±10⁰C.Is this condition giving an exemption for me on QW406.3 to prepare a WPS with maximum interpass temperature of 200⁰C.
Maximum interpass temperature observed during specimen welding: 140⁰C
Regards,
Limesh
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