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Recent content by iam42

  1. iam42

    Super Duplex - Where did the Nitrogen go?

    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...
  2. iam42

    Super Duplex - Where did the Nitrogen go?

    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...
  3. iam42

    High Ferrite Reading for 316 SS Weld

    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!!!
  4. iam42

    High Ferrite Reading for 316 SS Weld

    r6155, This is what the customer specified.
  5. iam42

    High Ferrite Reading for 316 SS Weld

    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...
  6. iam42

    High Ferrite Reading for 316 SS Weld

    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.
  7. iam42

    High Ferrite Reading for 316 SS Weld

    Hi DVWE, We are using a Fischer Ferritescope
  8. iam42

    High Ferrite Reading for 316 SS Weld

    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...
  9. iam42

    High Ferrite Reading for 316 SS Weld

    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%...
  10. iam42

    Diffusable Hydrogen Levels - Submerged Arc Wire/Flux Combination - Austenitic Stainless Steel

    Thanks Ed.
  11. iam42

    Diffusable Hydrogen Levels - Submerged Arc Wire/Flux Combination - Austenitic Stainless Steel

    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!!!
  12. iam42

    Diffusable Hydrogen Levels - Submerged Arc Wire/Flux Combination - Austenitic Stainless Steel

    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...
  13. iam42

    How should I qualify a an Autogenous Square Edge Butt Weld?

    Thanks for the help guys, I am probably gonna try and qualify a procedure along the lines of what gate described.
  14. iam42

    How should I qualify a an Autogenous Square Edge Butt Weld?

    DVWE, It is a seal weld for a vacuum
  15. iam42

    How should I qualify a an Autogenous Square Edge Butt Weld?

    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.
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