[MW:13566] RE: 13553] PWHT requirements -ASME B31.3

See below the interpretation. The weld build thickness may be considered as governing thickness for PWHT. but, B 31.3 does not address this weld build up.

However, as per material specification ( I think you are using SA105), any weld repair requires heat treatment. See below.

B3 1.3 Interpretations No. 14 14-01

Interpretation: 14-01

Subject: ASME B31.3b-1994 Addenda, Para. 331.1.3(b), and Table 331.1.1, Heat Treatment

Requirements

Date Issued: June 22, 1995

File: B3 1-94-064

Question (1): In accordance with ASME B3 1.3-1993 Edition, Addenda b, does the portion of para.

331.1.3@) which states “the thickness through the weld in any plane” refer to the weld thickness?

Reply (1): Yes.

Question (2): In accordance with ASME B31.3-1993 Edition, Addenda b, does the minimum

material thickness stated in para. 331.1.3(b) refer to the requirements of Table 331.1.1?

Reply (2): Yes.

Question (3): In accordance with ASME B31.3-1993 Edition, Addenda b, can the BHN (Brinell

Hardness Number) equivalent of tensile strength of material before PWHT be considered a minimum

value?

Reply (3): The Code does not address BHN equivalent of tensile strength or minimum BHN.

Excerpt from SA105

M.Vijayan

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Vikas Bhandari
Sent: Monday, January 23, 2012 6:19 PM
To: materials-welding@googlegroups.com
Subject: [MW:13553] PWHT requirements -ASME B31.3

Dear all

My question is that if a 15 mm build is to be carried out on a 25 mm thick flange face, would I require to do a post weld heat treatment? What would be the governing thickness in this case?

Section 3331.1.3 states that governing thickness shall be that of thicker component measured at the joint except in case of branch and fillet.

So does that implies weld joint? i.e. 15 mm in this case?

Any supporting document (eg ASME clarifications) would be much appreciated.

Thanks in advance.

Best regards

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