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Technical Discussions
Dhaval Jariwala
Dhaval Jariwala
03:31 Nov-08-2012
ASME BPVC Sec IX_Group_Number

Hello All,
Can anybody say me how the Group Number is designed in ASME SEC IX in Table QW-422. I need information what is the logic behind grouping the different material in different group.

 
 Reply 
 
Ananthan
Consultant,
RAA Tech Solutions, India, Joined Jun 2000, 36

Ananthan

Consultant,
RAA Tech Solutions,
India,
Joined Jun 2000
36
06:33 Nov-08-2012
Re: ASME BPVC Sec IX_Group_Number
In Reply to Dhaval Jariwala at 03:31 Nov-08-2012 (Opening).

ASME Sec IX QW 422 relates P no Group number based on the welding and mechanical properties. Materials with similar properties are made into single groups.

 
 Reply 
 
mahmoud refaat
NDT Inspector,
Egypt, Joined Aug 2012, 16

mahmoud refaat

NDT Inspector,
Egypt,
Joined Aug 2012
16
19:56 Nov-13-2012
Re: ASME BPVC Sec IX_Group_Number
In Reply to Dhaval Jariwala at 03:31 Nov-08-2012 (Opening).

based on my knowledge for any material the properties determine by 3 factors :
1- chemical composition (especially carbon content for ferrous material)
2- heat treatment
3- those two factors give you specific alloy with specific mechanical properties
so ASME IX categorized the material based on behavior during welding and according to specific range for both chemical and mechanical ( divide them in to P number)
but i think the origin behind group number for the same p number referring to the heat-treatment during the alloy manufacture like annealing and quenching that why we refer to group number just in case the PQR and it's mechanical test include impact test and as you know impact can alternate for the same alloy if heat treatment alters during manufacture like hardness properties so in this case supplementary variable will be essential variable during our wps qualification

 
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