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  • Users: kevlar49
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  1. kevlar49

    Specifying class for Method A

    Hi, I have a drawing that calls out ASTM E1417 Type I method A, form d, class 2. Is solvent remover class only specified on ASTM E1417 Type I, Method C or could it be specified if "form d" (nonaqueous) developer is used?
  2. kevlar49

    Reason for temperature on AMS 2774 for 625

    In AMS 2774, does anyone know what the metallurgical reason for the higher annealing temperature at 2050 F temperature for alloy 625 if brazing will follow? Normally, annealing would be at 1900 F, but footnote 9 in rev G requires a 2050 F anneal if high-temperature brazing is to follow.
  3. kevlar49

    Finding manufacturers of titanium metal matrix composites

    Does anyone know a good resource for searching for manufacturers of titanium metal matrix composites?
  4. kevlar49

    Appropriate conversion of hardness 304L

    Is ASTM E140 Table 3 (high nickel alloy) the appropriate table for converting microhardness to Rockwell for 304L stainless steel?
  5. kevlar49

    Where to measure underfill from when mismatch

    Where do I measure underfill from when I have mismatch? In this attached figure, should it be "A" or "B"? I can't find guidance in AWS D17.1.https://files.engineering.com/getfile.aspx?folder=37b4d1fb-93dc-447a-9062-0c9789ce55f6&file=welder_cert_7773.jpg
  6. kevlar49

    flash welded rings

    I am having trouble finding a supplier with the capability of making large diameter (~55 ") flash welded rings in high temperature alloys such as RA 330 and Inconel 601. Does anyone have any suggestions?
  7. kevlar49

    Hydrazine compatibility

    Does anyone know where I can find hydrazine compatibility with silver plate and TiN coating? I couldn't find it in MAPTIS.
  8. kevlar49

    Elgiloy Creep curves

    I am having trouble finding creep curves for Elgiloy. Does anyone know a good resource?
  9. kevlar49

    symbol interpretation

    Would you interpret this symbol this way or is this incorrect? Should I have two symbols instead?https://files.engineering.com/getfile.aspx?folder=bde4cf37-a233-4c4c-abee-79fda1bd023e&file=New_Microsoft_PowerPoint_Presentation.pptx
  10. kevlar49

    Fatigue properties for an alloy similar to VACOFLUX 9CR

    We are using this alloy called VACOFLUX 9CR. Unfortunately, the manufacturer does not have fatigue characterization of it. Does anyone know of a similar alloy that may have fatigue data associated with it?
  11. kevlar49

    Calculating galvanic current

    I have a situation where there are two dissimilar metals in contact with each other. They will be exposed to cryogenic temperatures, so there is a possibility of moisture wetting. I know the approximate potential in sea water service. I was looking for a way to conservatively estimate the...
  12. kevlar49

    Inconel 625 fracture toughness

    I am having difficulty finding the fracture toughness of Inconel 625 in the cold worked condition. Does anyone know a good resource?
  13. kevlar49

    Tensile Testing Machines

    I am trying to help my old high school out. Their tensile test machine broke down. I am trying to get a new one for them. Any advice on where I can purchase low cost, but reliable tensile testing machines that can test metals?
  14. kevlar49

    Need help with symbol interpretation

    When a groove weld joint is already partially beveled and a you specify a symbol with a v groove but do not specify the depth of the groove, is it interpreted as weld through the bevel into the backside or just start from the bottom of the v-groove. See my alternate interpretations in the...
  15. kevlar49

    p-number inconel 718

    I am having trouble finding the p-number (ASME) or M-number (AWS B2.1) for Inconel 718. Can someone help me?
  16. kevlar49

    deviation from NAVSEA tech pub 248 Table XI

    Is there anything in NAVSEA tech pub 248 that states that my welder performance qualification test assembly can deviate from the joint configurations shown in Table XI?
  17. kevlar49

    CGA G-9.1 testing

    Does anyone know companies (preferably in southern California) who can perform helium gas purity testing to CGA-G-9.1. We need to double check our gas vendor.
  18. kevlar49

    touch up with MIL DTL 5541 class 1A

    Is there any reason why we couldn't touch up scratches on a MIL DTL 5541 Class 3 with Class 1A? Either class 3 or 1A properties will suffice. I just want to know if there will be some incompatibility issues that could deteriorate the existing class 3 coating.
  19. kevlar49

    Arathane in R-134A

    Does anyone know of any chemical compatibility issues with Arathane (Hunstman printed circuit board coating) and R-134A?
  20. kevlar49

    UNJC rolled always

    Can unjc threads be machined or do they always have to be rolled?

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