Skirt welded joint coefficient problem for help

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Skirt shell is subjected to axial compression stress, the calculation of the axial compression stress did not use the coefficient of the welding joint value ah, may be regarded as the default is 1.
I think it can be considered that, from the state of stress, there is no ring to stress and therefore has nothing to do with the class a;
Under the axial compressive stress, only the B joints are related, in general, there is no ring weld in the skirt shell. If present, compressive stress seems to be insensitive to weld defects.
As in the end is not related, also please expert advice!

ASME generally take 0.45 to 0.55, the specific can look at UW-12

PVE in the 0.7PVE model can be found on the basis of

It seems that I have not seen the specific provisions, I generally do not make a ray detection, 0.7 or 0.65