Sour service qualification for WPS
Sour service qualification for WPS
(OP)
Hello everyone,
I have a few questions about qualifying a welding procedure for sour service.I'm fairly new, but I understand that the main course of action that eliminates the need for post weld heat treatment for ASME B31.3 piping welding is the use of lower hydrogen electrode, and then doing the NACE harness survey on the metal, HAZ, and weld area of the weld.
1. Can someone help recommend electrode types that are considered low hydrogen and good enough for this? This is for carbon steel, of strenght no higher than 57k or above.
. Also, a guideline for pre-heat treatment?
Thanks
I have a few questions about qualifying a welding procedure for sour service.I'm fairly new, but I understand that the main course of action that eliminates the need for post weld heat treatment for ASME B31.3 piping welding is the use of lower hydrogen electrode, and then doing the NACE harness survey on the metal, HAZ, and weld area of the weld.
1. Can someone help recommend electrode types that are considered low hydrogen and good enough for this? This is for carbon steel, of strenght no higher than 57k or above.
. Also, a guideline for pre-heat treatment?
Thanks





RE: Sour service qualification for WPS
RE: Sour service qualification for WPS
I looked at it and it talked about the required hardness test, and the positions where the survey is to be taken, but it does not talk about selection of electrode (filler metals) that can be used on a preliminary WPS to fulfil that harness test.
I was looking for a guide to filler metal selection, such that the weldment and coupon can pass the sour service test. Thank you.
RE: Sour service qualification for WPS
RE: Sour service qualification for WPS
RE: Sour service qualification for WPS
Preheating to meet hardness in the base metal HAZ depends on thickness and carbon equivalent. Assuming that you are qualifying the procedure on P1 group material without PWHT, I would recommend 200 F to 300 F. All the better if you can maintain a 450 F to 600 F interpass temp for the capping passes.