P9B materials welding qualification limit with impact & without PWHT
kamal nathan
Could one give the interpretation clarity of the below :
1.Refer to ASME SEC.VIII .DIV.1 UCS-56 table for P9B materials under
note 3 (a) which states that qualification has to be done in equal or
greater thickness than the production weld thickness(Our customer
specs.(UDHE) also specifies that all welding procedures shall be
qualified on plates not thinner than the part to be welded.)
&
2.Refer to ASME SEC. IX QW-403.6 which states that minimum thickness
qualified is the thicknes of the test coupen or 16 mm whichever is
less .
While comparing the above 2 mentioned statement: Whether we need to
do the welding procedure qualification for each thickness with impact
& without PWHT?
Thanks,
kamal
vijayan
Hi
The note is clear. For material over 16mm thk shall be PWHT with any qualified WPS. But, If the material thickness under question is <16mm, then the PWHT is not mandatory subject to that, the PQR should have been qualified on same or greater thickness than the production thickness.
Limitations on essential/supplementary variables per ASME Sec IX shall also to be complied.
// While comparing the above 2 mentioned statement: Whether we need to do the welding procedure qualification for each thickness with impact & without PWHT?//
Yes. Instead you can go for PWHT which is economical.
BR
M.Vijayan
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