Welding Procedure Qualification Question
Welding Procedure Qualification Question
(OP)
Hi everyone,
I have a question regarding a welding procedure qualification.
Recently, we performed a repair on a boiler tube that was slighly less than 3/16" diameter. However, our welding procedure only qualifies us down to 3/16" because we originally qualified the procedure using a 1/2" piece of plate. Under normal circumstances I would just weld the procedure on a .375" piece of plate and do teh required bend and tensile tests.
However, the material here is SA-335 Grade P91. So all I have access to is the original piece of pipe that was welded. This is a 1.25" OD x .179" thickness piece of tubing. Is there any way I can use this piece of tubing to qualify a new procedure for the correct diameter? I looked through the usual spots in section IX but the answer is not apparent.
Thanks in advance for any help.
Rob
I have a question regarding a welding procedure qualification.
Recently, we performed a repair on a boiler tube that was slighly less than 3/16" diameter. However, our welding procedure only qualifies us down to 3/16" because we originally qualified the procedure using a 1/2" piece of plate. Under normal circumstances I would just weld the procedure on a .375" piece of plate and do teh required bend and tensile tests.
However, the material here is SA-335 Grade P91. So all I have access to is the original piece of pipe that was welded. This is a 1.25" OD x .179" thickness piece of tubing. Is there any way I can use this piece of tubing to qualify a new procedure for the correct diameter? I looked through the usual spots in section IX but the answer is not apparent.
Thanks in advance for any help.
Rob





RE: Welding Procedure Qualification Question
If you were to qualify a new WPS with the 1.25" OD x 0.179" thick tube it would be qualified for a base metal thickness range of 1/16" to 0.358" and all diameters. See Table QW-451 of ASME Section IX. Diameter is an essential variable for the welder only, not the WPS. So you should be good to go.
Keep in mind Section I, Table PW-39-5 requires postweld heat treatment of P15E material (P91). Therefore your test coupon will have to be postweld heat treated.
RE: Welding Procedure Qualification Question
Thanks for the quick response.
RE: Welding Procedure Qualification Question
RE: Welding Procedure Qualification Question
I want to make sure I am understanding this correctly, because as pointed out, the coupons need to be stress relieved. Thus was the reason for my original question.
Thanks for the replies so far.
Rob
RE: Welding Procedure Qualification Question
RE: Welding Procedure Qualification Question
You are not qualifying the WPS for notch toughness or for PWHT, so plate would be much easier to test with.
Best regards - Al
RE: Welding Procedure Qualification Question
Re-read the OP. 2nd sentence.
RE: Welding Procedure Qualification Question
Best regards - Al