Dear All
I hope any one of you can help me on this issue,
Im reviewing a WPS that is qualified as per AWS D1.1, the project spec doesn't mention the CVN test, it just mention that WPS to be qualified as per AWS D1.1; the welding engineer made the cvn test at -20 deg. C with no explaination why the test to be at -20 deg. C;
To my understanding, if there is contract requirement the cvn test shall included in wps qualification; if no specified in the contract the cvn test can be omitted or cvn test can be done as per filler metal spec. (energy, temp. etc.)
Some infor. you may need: PQR made from 20" pipe, 1"tk material API 5L X56, weld process: TIG, SMAW, SAW; full pen. no back gouging
Thanks in advance
Have you asked the engineer? Being a welding engineer myself, I have often submitted WPS' for a job that doesn't require impacts, yet I had previously qualified WPS for a job that did.
Sometime is good to qualify a WPQT including CVN test, no harm for u to do a CVN test since project sepc. is not required CVN test and there is no acceptance criteria for the results obtained (no rejection). Assuming there is another project might required same range of WPS qualification + CVN test, u can use this WPQR to support. (but always subject to client's approval)
yes, I agree. it is not so expensive to do the cvn test, and this test also helpful for me for other jobs as well.
I just want to ask your expertise that: if there is no specific about CVN test, should I do CVN test for this WPS as per welding electrode spec (regarding the temp and energy?)
Thanks
To verify the Impact Properties of the weld metal is not contractor's resposibility but filler metal supplier. supplier needs to ascertain impact value for certain test temperature for each type of filler metal they supply as specified in the filler metal datasheet: for example Guarantee impact 27J @ -40C.
Noel Tan, I'm sorry to disagree with you but certain Codes do require the contractor to also verify CVN for filler metals used in WPS.
sorry, Jon20013... in this case we discussing on AWS D1.1. but not any other code.
In the case of D1.1, it is entirely up to the engineer. See D1.1:2006 paragraph 2.2.2. The engineer can specify testing on the PQR of weld, HAZ, or both, or whether appropriate filler metal classifications are acceptable.
Hi GRoberts
your advice helps a lot, thanks
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