welding procedure for P1 to P4 material acc. asme IX
welding procedure for P1 to P4 material acc. asme IX
(OP)
I have the following question,
When I have a welding procedure according ASME IX for SMAW and GTAW-SMAW for a P4 to P4 material.
Do I need a additional procedure for a P1 to P4 material?
QW-403,11 says no, but my client says yes I do? Who is right
JvB
When I have a welding procedure according ASME IX for SMAW and GTAW-SMAW for a P4 to P4 material.
Do I need a additional procedure for a P1 to P4 material?
QW-403,11 says no, but my client says yes I do? Who is right
JvB





RE: welding procedure for P1 to P4 material acc. asme IX
Welding Procedures requirements are defined in QW 200
Qw253 and QW256 list the variables for SMAW and GTAW respectively.
Both refer to QW403.11 for base materials as an essential variable.
QW 403.11 refers to QW 424.1 which states:-
Base Metal(s) Used for Procedure Qualification Coupon
One metal from P-No. 4 to any metal from P-No. 4
Base Metals Qualified
Any P-No. 4 metal to any metal from P-Nos. 4, 3, or 1
You are correct! Unless someone knows some hidden clause in this code that I am not aware of. I am using the 1999 addenda but I don’t think this will have changed in the latest issue?
For information on the ASME 9 and more www.gowelding.com
RE: welding procedure for P1 to P4 material acc. asme IX
The base metal that you test on doesn't negate the need for a qualified welding procedure.
However, if you have welders that are qualified to weld the P4-P4 procedure they should be able to weld the P1-P4 procedure without requalifying as long as the the F number of the filler metal doesn't change.
RE: welding procedure for P1 to P4 material acc. asme IX
ASME Section IX interpretation IX-89-58 deals with this subject.
Question (1): “A WPS is qualified for P5 to P5 base metals. Will the PQR for this procedure also support a new WPS for P5 to P4 base metals if all other welding variables remain the same?
Reply (1): “YES”
Although the P numbers are different, the concept is the same. I would however caution you as to your application. I do not know what code you are fabricating to (section I, B31.1). In ASME Section I the PWHT for P4 is 1100 F this also happens to be the PWHT for P1 material (no problem here). However, in ASME B31.1, the PWHT for P4 material is 1300 to 1375 F. Since the lower critical temperature for P1 material is ~1340 F I would be very hesitant to use the procedure to weld P4 to P1. If your current WPS shows a PWHT temperature in this range, I would suggest you qualify another WPS using P4 to P1 material.
You have to keep in mind that the ASME codes are primarily safety codes and not necessarily operational codes. The do not consider all of the different metallurgical combinations that may be possible for fabrication. It is up to the user of the code to make sure that the materials they are welding are metallurgically compatible with respect to PWHT, weld design, service requirements, and mechanical properties.
Hope this helps.
RE: welding procedure for P1 to P4 material acc. asme IX
RE: welding procedure for P1 to P4 material acc. asme IX
It is more Economic procedure and in accordance with CODE requirements.
Regards
Jorge