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  1. MikeMet

    Source of Cautionary Note in ASME Section II, Part C for E309 Filler Metal

    In ASME Section II, Part C, Appendix A, A7.10, the description of E309 filler metal there is a cautionary note that states: Embrittlement or cracking can occur if these dissimlar steel welds are subjected to a post weld heat treatment or to service above 700C. I believe this had to do with...
  2. MikeMet

    USING FCAW PROCESS FOR SS OVERLAY IN A CLAD VESSEL

    I agree with others that getting a proper chemistry at 3mm with E316L filler may be a challenge. To overcome this we have at times used an over alloyed filler metal, such as ERNiCrMo-4 or -10, just for restoring the cladding at the seam welds. Typically in the as welded condition, even in thin...
  3. MikeMet

    custom 321 piping

    Contact the good people at Dynamic Flowform. The can start with small hollows and make custom sizes. http://flowform.com/index.php
  4. MikeMet

    QW-193.1.3

    The short answer is yes. The minimum size of the weld, if a strength weld, is calculated using ASME Sect VIII, part UHX. However, there is no term or definition of "leak path" in Section VIII. So the leak path required by the design is undefined, but most people consider the weld size to be...
  5. MikeMet

    Cooling diagram Duplex stainless steel

    The attachment is something I have had for a while. Hope it helps.
  6. MikeMet

    Welding ductile iron and steel together

    To add, you will need to preheat to a very high temperature even for ductile iron. Consider a 500-650 preheat. The best option is to not weld unless you absolutely have to. Look into mechanical methods for attachment to elminate the cracking issues that can easily arise when welding any type...
  7. MikeMet

    Ammonia and stainless steel, corrosion

    You don't need water to prevent SCC on stainless steel in ammonia. It is typically considered resistant to ammonia stress corrosion cracking.
  8. MikeMet

    Welding cast Hastelloy C276

    If you are repairing a discontinuity in a casting made of Alloy C276 you should make the weld using matching filler metal. That way the casting should have homogeneous properties (as much as they can be in a casting). As a customer that is what I would expect. Not a casting of one alloy...
  9. MikeMet

    Titanium casting

    Can't cast the entire turbine in one shot, but you can cast parts made of titanium. It's done every day
  10. MikeMet

    COMBINING STAINLESS AND CARBON STEEL MEMBERS

    Let's not get too complicated here for no reason. Unless your component is going to be wet all the time or submersed, don't worry too much about galvanic attack. If there is a fire danger I would not use galvanized componets due to possible LME from molten zinc. If no fire danger, and not wet...
  11. MikeMet

    high strength pressure vessel materials

    You also have to consider whether you can get materials in tubular form. UHDE and Bohler both make good high strength, polyethylene process tubing, but it not considered weldable by the code. You would be hard pressed to find someone who makes 17-4PH sst, or 15-5PH sst in tubing in small...
  12. MikeMet

    Phased Array Ultrasonic Examination

    Need to settle an argument. Is phased array ultrasonic examination of welds considered a sophisticated version of shear wave examination? Or is it classified as something other than a shear wave examination?
  13. MikeMet

    NDE of a set-in nozzle weld in ASME VIII div 1 thin duplex shell

    We have had luck using phased array UT of nozzle fillet welds in duplex vessels. You will need a proper calibration sample to ensure relevant results.
  14. MikeMet

    CODE CASE 2418 for S32101 Material

    Yes, ASME Code Committee members get code case information free. There have been some real problems trying to weld lean duplex tubes directly to carbon steel tube sheets. Recommendations are to use a high nickel filler metal to get good results. However, provided your clad is thick enough...
  15. MikeMet

    Nondestructive test to determine Fy of steel girder?

    There is a method called Automated Ball Indentation that is a very fancy type of calibrated hardness testing that provides yield strength and fracture toughness data. http://ssmsystems.net/pdf/PVP170-2.pdf http://jjmie.hu.edu.jo/files/v4n4/JJMIE-14-09_Revised(9)/JJMIE-14-09_%20Modified.pdf...
  16. MikeMet

    High Temperature metal

    Metal are used at your operating temperature all the time. You can not ask for help here with out giving some process data because of the various forms of high temp corrosion that can occur based on what is in the gas, such as oxidation, sulfidation, deterioration from high temp nitrogen and...
  17. MikeMet

    Galvanic corrosion between CS and Duplex

    We have had that combination in service for years with no galvanic effect. However, you can still get crevice corrosion of the carbon steel gasket surface of the channel even with no galvanic effect. So pay attention to gasket type and bolting make up.
  18. MikeMet

    HRSG Inspection Plan

    Tetra puts out a good inspection planning guide for purchase at: www.tetra-eng.com/docs/sample_IPG.pdf. You can also review the attached for some reference;http://files.engineering.com/getfile.aspx?folder=1c8b0cb4-aa10-4dc6-a6f0-5dc812778a5b&file=OPERATINGEXPERIENCE_of_HSRG.pdf
  19. MikeMet

    C-276 Shaft Straightening

    I think you will have trouble with any of the methods discussed. We have had luck with and interative process of cold straightening and re-solution anneal. It will likely take more than two times, the key is to be patient.
  20. MikeMet

    Acid Pickling of ASTM A351 GR: CF3M

    There have been discussion on black deposits on cleaned stainless steel. There was no real determination of the problem. I have attached an article that may be of some...

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