Welder Qualification

[salohcin]

Is a 6G qualified welder qualified to weld a jacket leg can to a plate girder or does he have to qualify to 6GR. It is a T connection however the angle bevel does not change as in pipe-pipe connection and I cannot find conclusive definition in AWS D1.1 for T K Y for plate-pipe connection, it only mentions plate-plate or pipe-pipe. Any ideas?

 

[CWIC]

salochin:
I would interprete the D1.1 code as follows:
1.) For a T, Y, K connection a 6GR peformance qualification would be required. The 6G is a test used to verify the ability to weld tubulars in all positions (within thickness and diameter limitations), not with the restricted access to the joint such as a 6GR welder would encounter. Refer to AWS D1.1:2002, Table 4.9.
2.) While your application involves tubing to plate, qualification of a tubular product qualifies plate (within position and thickness limitations) also in accordance with AWS D1.1:2002, Table 4.9.

A number of my clientele use plate/tube/pipe to manufacture their structural products, many with acute angles and T, Y or K connection types. The procedures and personnel all qualify on 6GR's for these applications.

 

[salohcin]

CWIC
Personally I concur, however, some work colleagues of mine do not.
Without revealing any confidential information are you a specialist in this field?
If so I appreciate your help and feedback.
Thanx again.

 

[CWIC]

salochin:
Without knowing the specifics of your application, the only technical advice I could provide in addition to what I've already posted is:
a.) If the welder has qualified on plate, he/she is qualified to weld tubulars >24" (600 mm) in diameter within position and thickness limitations per Note 3 of the above referenced table.
b.) Refer to AWS D1.1:2002, Figure C4.1 for examples of tubular welds that do not require qualfication of a tubular product by the welder.

The best advice I can give to you at this point is to submit a formal inquiry to the AWS in the format specified in Annex F of the D1.1 code and state your case. In the past a phone call could help to obtain an unofficial and personal opinion by one of the code committee members, typically the chairperson, but that may not be the current situation.

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