[MW:5193] Welding of an attachment directly on the weld overlay

ASME VIII div 2 allows you to weld an attachment directly on the weld
overlay of a pressure vessel.

How should be qualified the WPS to carry out this welding?

The coupon of the PQR should be done with a buttering between the
material of the shell and the material of the attachment?

Could be asigned a P number to the weld overlay material and weld the
coupon between the P number of the overlay material and the P number
of the attachment?

Any idea would be helpful

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