NACE MR0175
NACE MR0175
(OP)
Can two separate procedures (processes) with hardness testing to NACE MR0175 be combined to fill a single joint, or does harness testing have to be done on a coupon with both processes in the same coupon.
Ex: GTAW root (procedure 1)
SMAW fill (procedure 2)
Can I combine these two procedures in a single joint and still meet the requirements of NACE MR0175 or do I need a pqr coupon containing both these processes harness tested?
Ex: GTAW root (procedure 1)
SMAW fill (procedure 2)
Can I combine these two procedures in a single joint and still meet the requirements of NACE MR0175 or do I need a pqr coupon containing both these processes harness tested?





RE: NACE MR0175
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: NACE MR0175
I would qualify a procedure for the combined processes to meet NACE MR0175 requirements, specifically.
RE: NACE MR0175
RE: NACE MR0175
RE: NACE MR0175
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: NACE MR0175
This is the quote from MR-0175:-
Welding shall be carried out in compliance with appropriate codes and standards as agreed between the supplier and the purchaser. Welding procedure specifications (WPSs) and procedure qualification records (PQRs) shall be available for inspection by the equipment user.
The qualification of welding procedures for sour service shall include hardness testing in accordance with 7.3.3.2, 7.3.3.3 and 7.3.3.4
*7.3.3.2 Hardness testing methods for welding procedure qualification
*7.3.3.3 Hardness surveys for welding procedure qualification
*7.3.3.4 Hardness acceptance criteria for welds
Your Proposal is to use :-Ex: GTAW root (procedure 1) SMAW fill (procedure 2)
In your case as stated above two separate PQR could be combined to support a WPS for MR -0175 applications. In order to do so, each PQR has to meet the requirements of MR-0175, wrt to base metal, restriction on chemistry of welding consumables (if any for C-Mn ans LAS ) and hardness requirements.
Also requirements of QW-200(b)should be met with respect to thickness of weld coupon and individual weld deposition thickness.
Thanks
.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario, Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299