Incorrect – QW-406.3 "An increase of more than 100F (55C) in the maximum interpass temperature recorded on the PQR. This variable does not apply when a WPS is qualified with a PWHT above the upper transformation temperature or when an austenitic or P10H material is solution annealed after welding."
Based on the PWHT temperature given, I assume that this is either a P1 (carbon steel) or P3 (C-½Mo, ½Cr‑½Mo) material and the PWHT is sub-critical (i.e. below the lower transformation temperature). (we don't know what the material actual is as this is an incomplete problem statement). The upper critical temperature is on the order of 870C for carbon steel.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Raghuram Bathula
Sent: Tuesday, September 14, 2010 9:27 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:7001] ASME SEC IX Code Issue
no, its does not apply when PWHT temp is below the upper transformation temperature
On Tue, Sep 14, 2010 at 6:13 PM, limesh M <limesh78@gmail.com> wrote:
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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