[MW:13634] RE: 13626] P9B materials welding qualification limit with impact & without PWHT

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

 

 

-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of kamal nathan
Sent: Tuesday, February 07, 2012 12:32 PM
To: materials-welding
Subject: [MW:13626] P9B materials welding qualification limit with impact & without PWHT

 

Team members,

 

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

 

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