Stress Relief IS a form of PWHT.
Others are such as normalizing, spheroidizing, solution annealing, etc.

Booyah,

WELCOME TO THE AWS WELDING FORUM!!

JS is correct.  Many people don't realize all the processes that are included under the vast heading of Post Weld Heat Treatment.  Annealing, stress relieving, normalizing, my mind went blank.... oh well, you get the idea. 

Do your due diligence to see what it is they are wanting as well as how it works into your current program or if you need to tweak the program.

He Is In Control, Have a Great Day,  Brent

Accept the customer request. Who doesn't want aditional revenue but make sure you have a written instruction from your customer and new PO or variation order is given, otherwise not easy to collect payment when the customer realise their mistakes.

I have witnessed a customer rep who insisted to carry out PWHT on pipe coupons of welder performance test. His contractor obliged, but when the bill comes, the customer representative refused to pay., he said his boss told him it's not necessary to conduct the PWHT and the contractor must be aware with the contract agreement.

After that incident, I never see the customer representative in our container office, I heard he get fired. The contractor QC told me that his boss already foresee the problem to come but doesn't mind to absorb the cost as long as they get rid of trouble maker.  

Like playing chess, sometimes you have to sacrifice to get a better position.