Qualification of 2 welders on one piece of pipe - ASME IX
Qualification of 2 welders on one piece of pipe - ASME IX
(OP)
Hi all,
We are currently working on P91 piping (B31.1), and due to the fact that material available for test coupons is extremely limited or would delay lots of weeks to be delivered, we decided to qualify welders from production welds (after the theoretical training), using volumetric NDE. My question is: Can I qualify (separately or together) 2 welders that have welded as a couple on one let's say 24" pipe? QW 302.2 (Section IX) states that the whole circumference shall be welded and tested. Is there any other topic that reliefs me from QW 302.2?
thanks in advance for your replies
We are currently working on P91 piping (B31.1), and due to the fact that material available for test coupons is extremely limited or would delay lots of weeks to be delivered, we decided to qualify welders from production welds (after the theoretical training), using volumetric NDE. My question is: Can I qualify (separately or together) 2 welders that have welded as a couple on one let's say 24" pipe? QW 302.2 (Section IX) states that the whole circumference shall be welded and tested. Is there any other topic that reliefs me from QW 302.2?
thanks in advance for your replies
Only best result in absolutely necessary time





RE: Qualification of 2 welders on one piece of pipe - ASME IX
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Qualification of 2 welders on one piece of pipe - ASME IX
Only best result in absolutely necessary time
RE: Qualification of 2 welders on one piece of pipe - ASME IX
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Qualification of 2 welders on one piece of pipe - ASME IX
Also see QW-452.1(b) for thickness qualified.
RE: Qualification of 2 welders on one piece of pipe - ASME IX
ASME IX is quite clear - the welder must weld full circumference.
QW452.1(b) is related to 2 or more welders welding a variety of processes or thickesses in the one joint.
Yes Steve, you are correct, the majority of pipeline codes do allow welders to weld sections of the pipe for welder qualificatio but this is not allowed in ASME IX.
Let's use a 6" pipe welded GTAW in the 6G position as an example.
For a right handed welder one side of the pipe is welded "forehand" (the easiest) and the other side is welded "backhand" or left handed (both more difficult than the forehand side)
How can it be a true competency test when one welder has the easy side and one welder has the much more difficult side ?
Regards,
Kiwi
RE: Qualification of 2 welders on one piece of pipe - ASME IX
Why did you even require P91 coupons ?
Any P1 material (eg. A106 Gr B) would have been fine. (QW 423.1)
Regards,
Kiwi
RE: Qualification of 2 welders on one piece of pipe - ASME IX
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Qualification of 2 welders on one piece of pipe - ASME IX
Only best result in absolutely necessary time
RE: Qualification of 2 welders on one piece of pipe - ASME IX
The AI obviously has a better grasp of ASME IX than you or other posters on here.
If ASME IX is the qualification code then you have to comply with that - just because various pipeline codes allow dual welders does not matter at all.
Why on earth are you chasing 24" P91 coupons ? Any small bore coupon will give you the diameter qualification you require.
Regards,
Shane
RE: Qualification of 2 welders on one piece of pipe - ASME IX
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Qualification of 2 welders on one piece of pipe - ASME IX
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Qualification of 2 welders on one piece of pipe - ASME IX
Normal industry practice is to qualify welders before they strike an arc. RT of a production weld is used as a last resort.
If the client has moved the "goalposts" at a late stage and not accepted Teokals previous quals on P1 material then the client must bear the time / cost of sourcing the required material,
Regards,
Kiwi
RE: Qualification of 2 welders on one piece of pipe - ASME IX
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04