Tube-to-tubesheet welds - ASME IX - PQR
Tube-to-tubesheet welds - ASME IX - PQR
(OP)
Hi Everyone,
We are welding stainless steel tube-to-tubesheets joints for one of our customers. We currently have a WPS/PQR to perform GTAW on stainless steel, which works for our application. However, our welder is finding that it is easier to not use any filler metal in welding these joints, so we are needing to create a new WPS/PQR.
Are tube-to-tubesheet welds considered a pressure retaining weld? I am trying to get away from doing the ASME IX tube-to-tubesheet procedure (I'm referencing QW-202.6), as we do not have time to purchase 2" thick stainless plate (the tubesheets we are dealing with are greater than 2" thick). I would like to perform a mock fillet weld test and qualify our welder from there, so what is to say I can't do that instead of the tube-to-tubesheet procedure?
Any input? Thanks in advance!
We are welding stainless steel tube-to-tubesheets joints for one of our customers. We currently have a WPS/PQR to perform GTAW on stainless steel, which works for our application. However, our welder is finding that it is easier to not use any filler metal in welding these joints, so we are needing to create a new WPS/PQR.
Are tube-to-tubesheet welds considered a pressure retaining weld? I am trying to get away from doing the ASME IX tube-to-tubesheet procedure (I'm referencing QW-202.6), as we do not have time to purchase 2" thick stainless plate (the tubesheets we are dealing with are greater than 2" thick). I would like to perform a mock fillet weld test and qualify our welder from there, so what is to say I can't do that instead of the tube-to-tubesheet procedure?
Any input? Thanks in advance!





RE: Tube-to-tubesheet welds - ASME IX - PQR
RE: Tube-to-tubesheet welds - ASME IX - PQR
To realy answer that it would be helpful if Code if costruction was known. For example under Sec VIII, Div 1 there are two approaches to tube-tubesheet welds, namely UW-20 and Nonmandatory Appendix A. Knowledge of design requirements of the joint may be needed as well.
Best consult with your customer...
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Tube-to-tubesheet welds - ASME IX - PQR
Are you're trying to switch from a technique with Filler to a Technique with No Filler?
Then I would say a Mock-Up is mandatory for qualifying everything, Procedure/Mock-Up, welders. I would think QW-193 is very clear about such qualifications.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
ca.linkedin.com/pub/pradip-goswami/5/985/299