We recently had an audit for ISO 9001:2015 and API Q1. We have our own process sheets (Weld Procedures) for each part number we run in our weld department. The initial first piece is cut and verified by our Metallurgist (We also have an in-house Induction HT department). We were cited for not having actual certified WPS's. We do not have an in-house CWI to complete the WPS's and would need to use a 3rd party to certify them. My question is, per ISO 9001:2015 8.5.1 (F), are we required to have certified WPS's if we already have our own proven weld procedures?