[MW:9313] RE: 9312] QW403.5 ASME SEC IX

You are correct. A test coupon consisting of P1G1 material welded to P1G2 material will qualify welding P1G1 to P1G2, P1G1 to P1G1, and P1G2 to P1G2. The portion of QW-403.5 highlighted in purple applies to the situation. It is common practice to qualify P1G1 to P1G2 to cover welding with impacts for all common P1 materials (G1 and G2). Note that SA-516 Grade 70 material will often be dual certified as SA-516 Grade 65 and/or Grade 60. In this case you only need to use this one material for test plates to get your combination. This is discussed in Interpretation IX-92-70:

John

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Vikas Bhandari
Sent: Tuesday, January 18, 2011 10:42 AM
To: materials-welding@googlegroups.com
Subject: [MW:9312] QW403.5 ASME SEC IX

Dear all

If I have a WPS with P1G1 to P1G2, is it qualified to weld P1G1 to P1G1 and P1G2 to P1G2?

I am not clear what QW403.5 states. Pls correct my interpretaion of the section.

This is my interpretation:-

QW 403.5

For ferrous materials in table QW/QB-422, a procedure

qualification shall be made for each P-Number Group Number

combination of base metals, even though procedure

qualification tests have been made for each of the two

base metals welded to itself.

(Is both P numbers and group numbers changing in this case (eg. P1G1 TO P2G2) or is only the group number is changing P1G1 to P1G2?

Assuming the first scenario, if one has 2 WPS

1. P2G1 to P2G2

2. P1G1 to P1G1

then also one needs to qualify a procedure for P1G1 to P2G1, which is obvious as change of p no. is an essential variable)

If, however, two or more

qualification records have the same essential and supplementary

essential variables, except that the base metals

are assigned to different Group Numbers within the same

P-Number, then the combination of base metals is also

qualified.

Assuming if one has 2 WPS

1. P1G1 to P1G1

2. P1G2 to P1G2

then for P1G1 to P1G2 combination is qualified by the above two WPS,

In addition, when base metals of two different

P-Number Group Number combinations are qualified using

a single test coupon, that coupon qualifies the welding of

those two P-Number Group Numbers to themselves as well

as to each other using the variables qualified.

Assuming if one has one WPS

1. P1G2 to P2G2

then the following 2 combination are also qualified by the above WPS,

1. P1G2 to P1G2

2. P2G2 to P2G2

3. P1G2 to P2G2

This variable does not apply when impact testing of the

heat-affected zone is not required by other Sections.

QW 403.5 APPLIES only when impact testing of HAZ is required by other sections?

back to my original question, I think even if I have a WPS FOR P1G1 to P1G2, I would need to qualify a wps for to weld P1G1 to P1G1 and P1G2 to P1G.

Your comments in this regard would be much appreciated.

Best regards

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