Recent content by iam42

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.