WPS - Partial Penetration

[BPVN]

Hi,
Can anybody guide me that, can i devlop WPS "with a partial penetration weld" as per ASME IX?
If yes, any code refernce or any pertinent information in ASME IX?
Prompt reply will be highly appreciated!
Regards
BPVN

 

[puigi]

It is up to the PV manufacturer to determine what the essential and non-essential welding variables are, and develop a WPS that will meet the welding requirements for the PV. Section IX will not do that for you.

You can start by reviwing the AWS's SWPS listed in APPDX E of Section IX and see if any of those meet your requirements. If you decide that one of them meets your requirements, the procedure for adopting it is in Article V of section IX.

I recommend you consult a welding engineer during this process.

 

[Duwe6]

You are overthinking the 'problem' Problem is in quotes as there isn't one. Any Sect IX Full-Penn WPS will allow you to weld any fillet welds or Partial-Penn welds on that P# material group, using the WPS process.

Only one caveat: Pay attention to 'big-T'. On an ASME WPS, basemetal thickness is given as T and weld metal deposited as t. You cannot make partial-penn welds on unlimited thicknesses, you have to stay within the 'big-T' limits of the WPS being used.

If you need to develop a new WPS due to P# or welding process, just write the WPS as for "open-root or backed groove welds". As you found reading Sect IX, for the WPS is is a Non-Essential Variable.

Backed vs. open-root becomes a very essential variable when qualifying *welders*, as that is a test of skill. A WPS is only proof that one piece of metal can be successfully welded to another using the specified process and filler material, using a specified preheat and interpass temperature. A PQR/WPS is a test for soundness of the welding process, and skill has no bearing on a WPS.