AWS D1.1 Joint dimension tolerance 1

[sw007]

In AWS D1.1, tolerance of the joint dimension is defined in Figure 3.3 and 3.4 by "as detailed" and "fit-up". What is the difference between "as detailed" and Fit-up".

For example: (1) For prequalified WPS, which tolerance I should use?

(2) For WPS qualifed by PQR, which tolerance I should use?

Thanks.

 

[GRoberts]

The tolerances are the same for standard joint details regardless of whether the WPS is prequalified or qualified by testing.

The "as-detailed" dimensions are the maximum dimensions allowed on the drawing or instructions describing the joint.

The "as-fit up" dimensions are the maxiumum allowed when measured on the part prior to welding the joint.

See D1.1 section 3.12.3

 

[sw007]

GRoberts:

Thanks for your reply.

So, for welding procedure qualification, which one should be used, "As-detail" or "As-fit". Based on your interpretation, we should use "As-detail" tolerance because it is drawing.

 

[GRoberts]

I would agree with that. That is what I have previously done.