With WPS/PQR required CVN test, I applied only 1 PQR at 3G up and support WPS qualify for all position, this also accepted by client and 3rd party as well
swnorris is right on.
The standard tests to qualify a WPS are visual, NDT (RT or UT), bends, and tensiles. This is for CJP groove plate, for clarity I will not address other scenarios.
Visual is evaluating workmanship, NDT is evaluating weld soundness, bends are evaluating ductility, and tensiles are evaluating strength. The code requires you to qualify the WPS for each position that it will be used. So the code feels that the welding position could affect one or more of these characteristics/properties (workmanship, weld soundness, ductility, or strength).
Occasionally, you need to also evaluate toughness. We do this through CVN tests. However, the code has stated that a 3G vertical up qualifies for all. This is because the heat input is significantly greatest in vertical up than in any other situation. Since heat input is the overriding factor in toughness, the accepts 3G up for all.
The same is not true for workmanship, soundness, ductility, and strength, so each position needs to be qualified separately.
For a simply plate groove CJP, I would need to run 2G, 3G, and 4G (per table 4.1) to qualify, ie. prove acceptable workmanship, soundness, ductility, and strength results for all positions. But I would only need to pull CVNs out of the 3G (up) plate in order to prove acceptable toughness results for all positions.
viettq,
Quote: I understand that: If a WPS is qualified 3G vertical up only, it will be qualified all positions.(for WPSs required CVN Testing only)
this is correct if the applicable code is ASME IX and this is wrong if the applicable code is AWS D1.1
Best Regards,
Noel Tan