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Thanks Ed, The mechanicals and chemical analysis were done about 2 weeks apart. They were carried out at the same Lab. There was no analysis done of the base material or the weld wire, I am using the values from the MTR's The analysis was only carried on on the finished weld. It certainly...

Hi, I have just completed a PQR for Super Duplex (S23750) using ER2594 GTAW wire, 100% Nitrogen backing gas and 100% Argon shielding. Test coupon - 10" Pipe x 0.30" thk The test results were good and shown below: Tensile: 119,800 & 120,700 psi Charpy Average @ -50°C: WM 119 ftlb, FL 76 ftlb...

Ed, An update on my Ferrite problem! I followed your advice and maintained a pre-heat of 200F until the joint was complete and we now have ferrite reading in he range of 5.5 to 7.5 Thanks for your help, i was starting to pull my hair out, not that there is much left!!!

r6155, This is what the customer specified.

DVWE, I am using 100% Argon for the backing. So far, we have never had a problem achieving the correct Ferrite content and we have welded this same job quite a few times. The only time I have used the 2.5% N mix for a backing gas is when welding super duplex and it helped a lot, especially...

Thanks Guys. We are in the North East and it is pretty cold. I will follow your advice and see where we go from there. Thanks again.

Hi DVWE, We are using a Fischer Ferritescope

Hi Ed, thanks for the input. We are using 100% argon. I did try a 2.5% Nitrogen mix for the shielding gas but we started to get porosity so I rejected that idea. We are welding a 1/2"-300# Sch 40S Branchette to the OD of a 1/2" thick round bar (see attached sketch). I have also just spoken...

Hi, I have an issue with a 316 GTAW weld where the ferrite is reading as high as 12%. We have a customer imposed ferrite range of 3-8%. Base material 1 chemistry is: A479-316/316L C .014, Co .047, Cr 16.69, Cu .28, Mn 1.34, Mo 2.119, N .040, Ni 10.55, P .029, S .0220, Si .27 (Calculated F%...

Thanks Ed.

Thanks Weldstan, I have tried to explain this to the customer who does not come from a welding background and he just keeps quoting B31.12 A-3.2 (i) even though the code of construction is B31.3!!!

Hi Guys, Can someone explain to me why SFA-5.39 (Specification for Flux and Electrode Combinations for Submerged Arc and Electroslag Joining and Surfacing of Stainless Steel and Nickel Alloys) does not require a diffusible hydrogen designator like SFA-5.17 does for Carbon Steel SAW. We are...

Thanks for the help guys, I am probably gonna try and qualify a procedure along the lines of what gate described.

DVWE, It is a seal weld for a vacuum

Thanks for the input Ironic, the 0.05" tab would be sacrificial. I am still a little confused on what the test plate would actually look like.

Hi guys, I am scratching my head here and was looking for some advice on how to qualify (ASME IX) the butt weld shown in the sketch. Any ideas would be appreciated. I would prefer to use no weld wire if possible. Dimension are in inches.

Thanks DVWE

Guys, I think I found my answer in Table of QW-424.1.

Guys, I need to weld a piece of 3/4" SA-335 P22 pipe to a A105 coupling (P5A to P1). ASME IX QW-403.12 tells me that I can use a WPS qualified using only P5A material to weld P5A to P1A if I use "the melt-in technique" I have a qualified PQR for welding P5A to P5A, can this be used for...

Ed, If I was to propose a Nickel based consumable I am pretty sure ferrite testing would not be required as the weld would be fully austenitic. Would there be any need to check for intermetallic phases, nitrides and carbides or sigma phase. I’m also not sure if checking grain boundaries for...