So far nobody has posted an answer to your question, so I'll give you my personal opinion.
You say you've never had any problem welding those materials using a method (or procedure) you developed, but now you need to qualify the method due to contractual reasons.
That means the method you've developed is fine. So, if I were you, I'd simply describe the method, i.e., put it in writing with all the details, and have it approved by the client.
Giovanni S. Crisi
Sao Paulo - Brazil
P.S. A question on grammar. I've always heard Americans saying "If I was you". However, when I studied English many years ago, I was tought that the correct way is "If I were you", Is that right?
Explained well!!
I would also add though to find out what code the WPS/PQR need to fall under. The code will give you the variables that you need to record. And most code give you example procedure forms.
And to you grammar question - when you hear that, the person saying it is using poor grammar. In that instance, it's "were". Poor grammar is rampant in the soutern states with all the "rednecks" (I'm one of them and from here, so not harpin on anybody). The key is to speak and write how YOU were taught, and I'm sure you'll be fine. You have to learn to kinda translate...intead of "I have done this", you may hear "I dun did that", or "I don't have any" you'll hear "I ain't got none"...you get the idea.
Thanks for the lesson, New Tito.
Giovanni S. Crisi