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Re: [MW:23509] Governing Thickness for PWHT(B31.1&31.3)

By Materials & Welding
Q-1 yes PWHT is applicable for joint between 45mm and 20mm. See interpretation of B31.3 

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On Sep 21, 2015, at 7:20 PM, Mohd Siraj <mohd52100@gmail.com> wrote:


What is governing thickness for PWHT is it weldmetal being welded or thicker component being welded?

ASME B31.3

331.1.3 Governing Thickness. When components are joined by welding, the thickness to be used in applying the heat treatment provisions of Table 331.1.1 shall be that of the thicker component measured at the joint.

Q-1 : If  i have one joint dissimilar butt joint between P1 # 20mm thk and 45mm thk and weld metal thickness is 20mm (40mm portion is made tapper).
Still i hve to do PWHT for this joints as per 45mm.??

(i know as per B31.3 if preheat is applied 95C pwht not req,but what in case of service requirement is PWHT.)

ASME B31.1

132.4.1 The term nominal thickness as used in
Table 132 and Notes is the lesser thickness of (A) or (B)
as follows:
(A) the thickness of the weld
(B) the thicker of the materials being joined at the
weld

Same things applicable as per B31.1 ??


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