ASME SEC IX Code Issue
limesh M
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
Raghuram Bathula
John Henning
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.
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John Henning
No - Per QW-406.3 WPS maximum permitted is PQR value + 55C. Therefore WPS IP max = 140C + 55C = 195C
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GOSWAMI Pradip -THERMAL
Limesh,
PWHT is an essential variable as per Sec-IX. Please look under any table from QW-252 onwards.
If I understand correctly: You’ve :-Low temperature carbon steel impact tested PQR with a PWHT range of 600⁰±10⁰C.
· This PQR will support a WPS with PWHT only. It will not support a WPS without PWHT.
Regarding the max interpass clause QW-406.3, An increase of more than 100°F (55°C) in the maximum interpass temperature recorded on the PQR is considered to be a supplemental essential variable. This does not apply if the PWHT is for C.S is above upper transformation temperature (7230C) or for austenitic S.S , when soln annealed.
As the PWHT in your case is 600⁰±10⁰C. the max interpass temperature clause as above will apply, second clause as above will not apply.
To summarize based on the PQR data(max interpass 1400C), on paper max interpass allowed would be 1950C ( when there’s impact requirement), welds shall be subject to PWHT. If you want to refer this PQR for case where PWHT is to be performed but No impact Requirement, you may increase interpass temperature to 2000C.
Hope it clarifies your query.
Thanks.
Pradip Goswami,P.Eng.
Welding & Metallurgical Engineer/Specialist
Ontario Power Generation Inc.
Email-pgoswami@sympatico.ca,
From: material...@googlegroups.com
[mailto:material...@googlegroups.com] On Behalf Of limesh M
Sent: Tuesday, September 14, 2010 8:43 AM
To: material...@googlegroups.com
Subject: [MW:6999] ASME SEC IX Code Issue
Dear All,
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limesh M
Max interpass temperature recorded during PQR - 140 C
Karthik
Hi,
I dont find where is the interpass temp.and all in QW403.6?
Pls.Find below the Extraction from ASME Sec.IX-2007
QW-403.6 The minimum base metal thickness qualifiedis the thickness of the test coupon T or 5⁄8 in. (16 mm),whichever is less. However, where T is less than 1⁄4 in.(6 mm), the minimum thickness qualified is 1⁄2T. This limitation |
does not apply when a WPS is qualified with a PWHT |
above the upper transformation temperature or when an |
austenitic material is solution annealed after welding.
Regarding Interpass Temp.Pls.find below the extraction from code.
QW-406.8 An increase in the maximum interpass temperatureof more than 100°F (56°C) from that achieved on the test coupon and recorded on the PQR. The interpass temperature shall be measured and recorded separately for each tempering weld bead layer and, if any, for the surface weld bead layer(s). The WPS shall specify the maximum interpass temperature limits for each tempering bead layer separately and for the surfacing weld bead layer(s), if any.
Hi limesh,
As he pointed out for interpass temp.your wps shall be with interpass temp 140+56 =196
Thanks & Regards,
(Karthik)
Karthikeyan.S
QA/QC Manager
Getabec Energy Co.,Ltd.
379,Moo6,Soi8,Nikhomphatana,
Rayong-21180,
Thailand.
Phone: 0066 38 897035-8 (Off)
Fax: 0066 38 897034
Hand Phone: 0066 892512282 --- On Tue, 9/14/10, John Henning <jhen...@deltak.com> wrote: |
limesh M
Karthik
Dear All,
Sorry for my mistake in Interpretation and suggestion on this quiery.
According to Mr.John,he was correct with QW406.3.
Thanks & regards,
(karthik) |
|
Karthikeyan.S
QA/QC Manager
Getabec Energy Co.,Ltd.
379,Moo6,Soi8,Nikhomphatana,
Rayong-21180,
Thailand.
Phone: 0066 38 897035-8 (Off)
Fax: 0066 38 897034
Hand Phone: 0066 892512282 |
| --- On Wed, 9/15/10, limesh M <lime...@gmail.com> wrote: |
george....@gr.bureauveritas.com
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
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limesh M <lime...@gmail.com>
Sent by: material...@googlegroups.com 14/09/2010 15:43
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usman gani
<george....@gr.bureauveritas.com> wrote:
> 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
> Cell: +30 69 44 64 62 04
>
>
>
> <limesh78@gmail.c
> om> To
> Sent by: material...@googlegroups.com
> materials-welding cc
> @googlegroups.com
> Subject
> [MW:6999] ASME SEC IX Code Issue
>
>
> Please respond to
> materials-welding
> @googlegroups.com
Rajesh...@linde-le.com
As per ASME Sec IX , Pre heat is essential variable not supplementary essential variable hence it is mandatory to observe the requirement of QW406.1
Inter pass temperature is supplementary requirement. However it is not applicable if PWHT performed above upper transformation temp i.e Normalizing, solution annealing as per QW 406.3
Hence in your case It doesn't give exemption to the requirement for Inter pass temperature
Best Regards
Rajesh Patel
Executive Engineer - Materials Technology, QA/QC & Standards
Linde Engineering India Pvt. Ltd.
'Linde House'
Opp: VUDA Office,VIP Road, Karelibaug,Vadodara - 390018,India.
Tel.: +91 265 3056706, Fax: +91 265 23335213, Mobil: +91 9909953459
Rajesh...@linde-le.com, www.linde-india.com
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