Welder performance notes (ASME IX)

When welder is required re-qualification?
Who has not welded greater than 6 months as QW-322.1.
Any change of essential variable listed for each process as QW-416.

How to renewal of qualification?
Welder shall conduct one test coupon/product on either plate or pipe, of any material or thickness as QW-322.2 (a).

Welder prepares the PQR, does he pass welding performance as QW-350?
Yes, who is also qualified within the limits of performance qualification, read more QW-301.2.