AWS D1.1 Preheat
AWS D1.1 Preheat
(OP)
Can a PQR that has been qualified but was not done with pre-heat be used (exact same plate material, joint, welding process, etc...) when customer documents require pre heat on production product. In other words: can a PQR that didn't have preheat be used for production when pre-heat is required?





RE: AWS D1.1 Preheat
RE: AWS D1.1 Preheat
"This is for CVN test requirements." If the customer is willing to just have you use a specified minimum preheat & interpass temperature, you are OK.
If the customer wants to see a qualified WPS with tested minimum CVN values, you need to qualify a WPS.
I'll bet that your Salesman/Estimator missed a CVN requirement, right?
RE: AWS D1.1 Preheat
Thank you for the response. Our customer does specify a very exact preheat, I think at this point it is best to ask our customer if they would accept out PQR and add preheat.
RE: AWS D1.1 Preheat
What code year are you working to? There are limitations in the D1.1 essential variables, but arguably, you could increase the production preheat using the non-preheated PQR if you do not increase your maximum interpass temperature >100°F.
RE: AWS D1.1 Preheat
This PQR is for a CVN impact required test. I am working to AWS D1.1, 2010 edition.
RE: AWS D1.1 Preheat
RE: AWS D1.1 Preheat
e.g.
If I have a PQR with 50F min preheat and a max interpass of 500F, I can write a WPS for 200F minimum preheat and keep my max interpass the same, and still meet CVN supplementary essentials.