Thickness over which PWHT must be performed.

[vitalis77]

Hi quys,
In a previous query I was in search of a SPECIFIC paragraph in the ASME code (VIII, 31.3,31.4,31.8) that defines the thickness over which, Post Weld Heat Treatment should be performed. This query still remains. Could someone enlight me?

 

[metengr]

Depends on material, weld joint thickness and Code application. Please enlighten us as to your specific application.

 

[SnTMan]

vitalis77, for Section VIII, Div. 1, see:

UCS-56, UNF-56, UHA-32,44 and 105, UCL-34

for the most common requirements, other Parts may apply depending on your materials of construction.

Regards,

Mike

 

[carthago]

To my knowledge

1/- For ASME/ANSI B31.3 see its table 3331.1.1 (Requirement for heat treatment)

Temperature or holding time are function of the material group and material P number.

For instance for P no. 1 ( A106 gr.B, A-333 Gr.6 ) it start from 19 mm = 3/4 "

2/-But this could be over-ruled by process condition, which could require a PWHT

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same as above for ASME VII-DIV.1 , then refer to tables in UCS part.