Welder qualification to weld unassigned metal and different process 1

[engr2GW]

Hi,

1. I understand that a welder qualified to weld an F6 filler metal is automatically qualified to weld F5 -F1, does it matter if it's the same or a different process? example, a welder qualified with TIG ER-70S-6, can the welder weld a 7018 and/or 7010 electrode SMAW?

2. If the welder is going to weld a 4130 (unassigned) to an A106 B (P1) in production, does the welder's qualification test have to be on a 4130 to P1? or can a welder test with a P1 to P1 and weld the above?

Thank you for your help and input.

As much as possible, do it right the first time...

 

[engr2GW]

In addition to the above question,
the welding procedure has PWHT which is necessary to relieve residual stress, enhance ductility and reduce hardness, since these factors may affect the bend test, it is necessary to PWHT the coupon during the welder qualification test before the destructive qualification test?

As much as possible, do it right the first time...

 

[stanweld]

1. Your understanding is totally wrong. Welding process is an essential variable. Please review QW-433 regarding Alternate F-Nos.
2. 4130 to P1 is required. Refer to QW-423.

 

[engr2GW]

Sorry, I think the higher F number qualifying lower F nos is for procedure qualification, not welder qualification.

Thanks, what about the thought about PWHT?

As much as possible, do it right the first time...

 

[stanweld]

Again, your assumption is wrong.

 

[Duwe6]

F's don't really group. F6 qualifies for F6 - Period
F5 qualifies for F5 - Period
Only F2, 3, & 4 have 'gimmies' for the lower #'s. That is what you are thinking of: F4 qualifies the welder for F3, 2, and F1. F3 for F2 & F1.

 

[engr2GW]

Thanks Duwe6, that's what I was thinking.

Can anyone through any insight into the second question about PWHT?
Thanks for your help

As much as possible, do it right the first time...

 

[Duwe6]

PWHT on the welder's coupon is required for destructive testing - bends - but it can be waived if the coupon gets Volumetric Examination [X-ray or UT shearwave]

 

[stanweld]

For WPS qualification, a change in F No. is an essential variable.

 

[gtaw]

Four of the essential variables for procedure qualification include:
Welding Process / a change in welding process requires the WPS to be requalified.
P numbers (base metal) / a change in P number requires the WPS to be requalified.
F number (filler metal)/ a change in F number requires the WPS to be requalified.
A Number (weld deposit chemistry)/ a change in the A number requires the WPS to be requalified.

I alway keep in mind what the letters ASME stand for to keep my sanity when working with ASME Section IX:
Always, Sometimes, Maybe, and Except. Those four words are applicable to the four essential variables listed above. The tables contained in Article II lists the welding variables that apply to each welding process. The details of how those variables apply are listed in Article IV.

The sanity check is that a variable, when changed, will affect the mechanical properies of the weld are typically considered to be an essential variable. Thus, anytime an essential variable is changed beyond the permitted range listed in Article IV, the WPS will have to be requalified.

Moving to welder performance qualification, the welder follows a WPS that is already qualified, so we know the WPS will produce the necessary mechanical properties. What is being evaluated during performance qualification is welder skill. In essence, any welding variable that requires a certain skill on the part of the welder is an essential variable for the purpose of welder performance qualification. The essential variables for welder performance testing are listed in Article III. Article III references specific paragraphs in Article IV for the specifics and the ranges of qualification. In part, the essential variables for performance qualification include:
Welding process / a change requires requalification
F number / a change requires requalification with the exception (remember ASME?) F1 through F4 and in some cases F5, qualifying with a higher F number qualifies for a lower F number.
Base metal / a change may require requalification.
Position / a cange to a position for which the welder is not qualified requires requalification.
With or without backing / with backing is limited to double sided groove welds, partial joint penetration groove welds, and welds made with backing. Qualification without backing covers the welder with or without backing.

Those are the "highlights". You must refer to the code to get the specifics.



Best regards - Al

 

[rayinspection13]

I Need to qualified ASTM a513 WPS any one with suggestion? and matching consumable I am using AWS D1.1 Thanks