ASME - Welding Procedure Specification 3

[Kelvigal1000]

Hi,

We recently did a Repair on a MC331 propane tank. It was to fix a pinhole in the weld that joins the coupling on to a tank head. With all the paper work involved, I understand that we should also include a Welding Procedure Specification & Welding Procedure Qualification Record.

My company already has a few WPSs & WPQs. But I am not sure which one of them would match the procedure that we have done(The base material and filler material on those WPS do not match the ones that we have used on this repair.) So I am wondering if I have to fill out new WPS & WPQ. And if I do fill out new ones, do we have to get them qualified ?

I would appreciate any help regarding this. I am new to this field and still getting a grip of all the procedures.

Repair Details: Head material - SA612, Coupling Material: SA105, Welding Rod used - E8018 C1. Kindly let me know if anybody needs more info.

Thanks !

 

[metengr]

For this type of weld repair, the WPS should have been qualified before the repair was performed. What you will need to do is to qualify a new WPS/PQR in accordance with ASME Section IX with the correct base material (P-No1) and filler metal (A-No and F-No), thickness ranges for the base material and weld deposit thickness range using the same welder that completed the original repair (if possible).

 

[jwhit]

You could possibly sit down with QW253 and your procedures, go over them line by line to see if any of them match precisely how you made the repair. You will have to rely on your welders to give you the criteria they followed. As you go over them, you will have to go to the referenced part of QW400 and review the criteria found there. If you are lucky, your people will have somehow welded per a procedure that is correct for your weld. If not, you will have to gather the criteria they followed and develop a PQR and WPS. Keep in mind that it needs to account for the variables found in QW253. Learning the code requirements is not an easy task, especially when you are thrown into it without any real training.

 

[Kelvigal1000]

Hi,

Thank you for the inputs. I am reading all the welding variables and trying to fill out the WPS & WPQ.

About QW400, why is it that all the variables have a definition starting with 'change in' or 'increase/decrease', 'deletion/addition' ?

Also, can one WPQ qualify more than one WPS ?

 

[jwhit]

In most cases that means if you change the variable one way or the other, you will need to qualify a new PQR if it is an essential or supplementary essential. If it is non-essential you will be required to document the change through addendum or revision.
Yes, you can qualify multiple weld procedures with a single PQR (procedure qualification record)provided that all variables are properly addressed by the PQR and included in the WPS. Multiple PQR's can also be used to write a single WPS. Just be careful about the variables. A WPQ is for the Welder Performance Qualification. The nomenclature can be confusing.

 

[Kelvigal1000]

Thank you jwhit. I am gaining better understanding of the procedures now.