Consumable for API 5L X60 PSL1

Date 08-03-2016 15:33 Edited 08-04-2016 05:51

I would go with 80 ksi filler metal.

I see MBSims is recommending an 80 ksi filler metal with nickel additions. I have to ask why use a filler metal with nickel when the base metal being joined does not contain nickel as an alloying element. I'm not saying it is wrong, just wondering what the benefit or the justification is.

You would most likely have to qualify the WPS per ASME Section IX.

Al

By MBSims

Date 08-04-2016 22:50

Definitely other options out there. We usually use E8010-P1 for the whole weld with SMAW root and fill. Could also use ER80S-D2 and E8018-D1. The nickel containing rod gives good impacts, but he did say PSL1 so impacts would not be an issue.

By 803056

Date 08-05-2016 03:01

I concur on the issue of the nickel improving impacts of the weld, but little to be gained in the HAZ. At least we're on the same page and I wasn't out in the left field picking my nose waiting far a ball to come my way.

Best regards - Al

By Dines.Win Date 08-05-2016 07:41

Thank you for your reply. Still I have few doubts on this.
one of my fabricator has qualified the PQR using ER-70S2 and E-7018 and it went through the lab test. All req

By Dines.Win Date 08-05-2016 07:43

Thank you for your reply. Still I have few doubts on this.
one of my fabricator has qualified the PQR using ER-70S2 and E-7018 for the same material and it went through the lab test. All requirements of SEC-IX have been met , in that for tensile testing the coupon broke from weld. Kindly give your opinion on this.

By jstnjstn Date 08-05-2016 13:52

We have qualified multiple procedures in our lab here as well using 70 series rods. This combination has been qualified on the same base material several times. 70 series rods/wire should be fine.

By MBSims

Date 08-14-2016 16:13 Edited 08-14-2016 16:45

ER70S and E7018 have a specified minimum yield strength (SMYS) of 58 ksi and a minimum specified tensile strength of 70 ksi.
API 5L X60 PSL1 has a specified minimum yield strength of 60 ksi and a minimum specified tensile strength of 75 ksi. Not a large difference in yield and tensile, and the actual strengths are typically far enough above the minimum to pass PQR tests. If you use 70 ksi weld material and your design is based on SMYS, such as pipelines under DOT Part 192 or Part 195, you may want to require test reports for the production weld material to demonstrate the weld material is capable of matching the SMYS for the pipe.

Edit: I just checked ASME B31.8 and the design formula for pipe is based on SMYS (paragraph 841.1). You may want to check with the piping designer to make sure they are OK with ER70S-X/E70XX weld materials.

By 803056

Date 08-05-2016 15:00

70 ksi filler metal is not a "matching" filler metal, but it often attains higher than the minimum specified tensile strength because of strain hardening. So, it works. This called undermatching the filler metal because the filler metal TS is slightly lower than the MSTS of the base metal. Most filler metals produce mechanical properties higher than the minimums specified by the filler metal specification.

Best regards - Al