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  1. 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...
  2. 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%...
  3. 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...
  4. iam42

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

    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.
  5. iam42

    Welding P1 to P5A

    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...
  6. iam42

    I'm stumped with Super Duplex!!!!

    Hi Guys, I have just tried to qualify a Super Duplex test using 3/4" Sch 160 pipe and it is failing on the corrosion test! The test was welded in the 2G position with the following parameters: Wire ESAB ER2594 Root 75A, 11V, 1.8 in.min TS ((27,500 J.in) 2nd Pass 95A, 11.6V, 2.9 in/min (22,541...
  7. iam42

    Root Weld of Super Duplex

    Hi Guys, I have just completed a Super Duplex PQR and there is a 2" long area where there is some heat tinting. The rest of the root look great. This test coupon has to undergo G48 Method A corrosion testing. Would there be any advantage or disadvantage to grinding the root flush as this is...
  8. iam42

    Welding Gr.22 to Gr. 91

    Hi Guys, We have a customer who has requested that we weld A182 Gr.22 sockolets to our A335 P91 pipe header. I will have to qualify a new WPS, but after some "google" research I am not quite sure what the best welding consumable to use will be. The design temperature for this application is...
  9. iam42

    Recommendation for Oxygen Meter for Gas Purge.

    Hi Guys, I need to purchase an Oxygen meter for an upcoming job we are doing. I need to be able to measure the oxygen content for a super duplex job that will be purged with Argon and Nitrogen. Does anyone have any recommendations for a meter that will do the job and as I have never done this...
  10. iam42

    Failed Impact Tests

    Guys, I just had the test results from a PQR that I recently ran and the impact testing failed miserably. The test coupon was 12" Sch 80, SA106 Gr.C pipe. The test temp was -46°C The results were as follows: Weld Metal - 100,121,27 Fusion Line - 14,20,13 FL +2mm - 11,8,10 FL +5 - 2,8,8 The...
  11. iam42

    Qualifying PQR for Welding Grade 91 Material with two PWHT cycle's

    Hi Guys, I am about to qualify a Grade 91 welding procedure using GTAW and SAW, SA387 Gr.91, 1" Thick with two PWHT cycles. We already have a procedure for this that had a PWHT cycle of 2 hours at 1400°F. All hardness, impacts and tensile test were successful. Our customer requires that a 2nd...
  12. iam42

    Distortion when welding Slip On Flanges

    Hi Guys, I was wondering what novel ways you guys use to reduce angular weld distortion from welding a slip on flange. I have attached a pretty crappy sketch but hopefully it will give you a rough idea of what I am talking about. The problem is mainly when welding Stainless Steel flanges that...
  13. iam42

    P91 PWHT Question

    Hi Guys, I have just had a question put to me from one of our customers and I am not sure how to answer it! We supplied them some P91 pipe spools where the welds were PWHT'd for 2 hours per our qualified WPS. Our customer has now added attachments to these spools and now needs to PWHT their...
  14. iam42

    Duplex and ASTM G48-A Test

    Guys, I am really struggling on how to proceed with a weld procedure qualification that I am currently working on. The material is 8" sch40 2205 Duplex. Our customer has a requirement for corrosion testing IAW ASTM G48 method A. His criteria for the test is testing at 35°C for 72 hours. The...
  15. iam42

    Welding 3" Thick 347 SS to Carbon Steel

    Hi Guys, I have a job coming up that requires us to weld 3" thick SA182-347 to SA106 Gr. C Pipe. I am no metallurgist but I have read enough in here to scare me a little with regards to Re-Heat Cracking on thick sections. I am not sure if this is a major factor but the design temp for this...
  16. iam42

    Protecting Machined Surface during PWHT

    Hi guys, I seem to remember a company I worked with that would "paint" finished machined surfaces with a "chalky like" product. I was used to try and reduce the amount of scaling during the PWHT process. For the life of me I cannot remember what it was called. If anyone knows of this product...
  17. iam42

    Welding Carbon Steel Root With FAC Requirements!

    Hi Guys, We have a project in-house that requires all material to be resistant to Flow Accelerated Corrosion. The material to be used is A106B for the pipe and A105 for the flanges. The requirement that has been stipulated is that all material including weld wire must have a minimum chromium...
  18. iam42

    Welding Root to meet Requirements for FAC

    Hi Guys, We have a project in-house that requires all material to be resistant to Flow Accelerated Corrosion. The material to be used is A106B for the pipe and A105 for the flanges. The requirement that has been stipulated is that all material including weld wire must have a minimum chromium...
  19. iam42

    Cold Rolling SA387 Gr.91 Plate

    Hi, Does anyone know of any precautions needed for cold rolling Grade 91 Chromoly plate. The plate will be 3/8" thick and rolled to form a cone with a small diameter of approx. 10" and approx. 20 inches long. I will PWHT the long seam as normal. Please note, this cone will not be part of the...
  20. iam42

    Looking for a Hardfacing Consumable for Pressure Piping.

    Hi, I need to hardface overlay the ID of a 316L pipe that that will be used in a B31.1 piping system. I am looking for a consumable that will achieve a hardness of approximately 40HRC and be crack free and meet the requirements of ASME IX Table QW-453. The design condition are 300 psig and...

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