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[MW:7842] MW: 7833- PWHT Requirement

By Materials & Welding

Hi,

Table 331.1.1of ASME B-31.3 specifies all the PWHT requirements. What material has to be subject to PWHT, C.S, LAS ??? can you provide  the details. The time and temperature range for  any material is pretty much well defined in the above table. One should  perform PWHT within the suggested temperature range. However its' always advisable to meet the the minimum PWHT temperature recommended by the code to meet all mechanical properties, plus hardness , which would influence any environmental assisted cracking such as SCC.

Regarding your last query, components may  undergoes repair and PWHT in service. What's the  extent of damage and repair, could you be specific??.

Thanks.


Pradip Goswami,P.Eng.
Welding & Metallurgical Specialist & Consultant
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.net

-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Noushad cp
Sent: Tuesday, October 26, 2010 7:27 AM
To: materials-welding
Subject: [MW:7833] PWHT Requirement

Dear All,

Please reply the below questions regarding the PWHT

1. what is the time limit to carried out the PWHT after completion of welding as per B31.3

2. In B31.3 anywhere mention the Type of service also range of PWHT varies....

3.What will happen if PWHT will carried out after 6 Month service.

Please explain in detail with relevent clause.

Noushad
Doha

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