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  1. CoryPad

    Differential Scanning Calorimetry (DSC)

    That device is multi-purpose (TGA, DTA, DSC). If you use a tradition DSC, the sample is contained inside a sealed pan that will prevent oxidation.
  2. CoryPad

    Technical drawing reading

    The meaning of each character is the same. They both signify a range of acceptable dimensions (from 0.025 mm to 1.00 mm, from 1.00 mm to 2.25 mm). SAE does not adhere to stringent format rules for their standards, so you can see many examples like this when using their standards.
  3. CoryPad

    Doubts on 4140 steel microstructure

    This is bainite microstructure, and based on low toughness, it must be upper bainite. This structure is possible with 4140 steel when it has been subjected to intermediate cooling from the austenite phase.
  4. CoryPad

    What is a "phase angle" in a mechanical drawing?

    Fase auf Deutsch = bevel Phase auf Deutsch = phase
  5. CoryPad

    PV1200 exposure as per TL211

    TL 211 is a standard from Volkswagen, with the title Paint Coating on Exterior Plastic Parts. PV 1200 is another standard from Volkswagen, with the title Aggregate, Bauelemente, Systeme, Halbzeuge - Klimawechseltest. You can contact VW for more information.
  6. CoryPad

    Threaded Cylinder With End Caps Subjected To Internal Pressure - Thread Failure

    Either are possible depending on wall thickness, materials, sealing methods, etc.
  7. CoryPad

    Welded joint material properties.......

    Welds typically are fatigue sensitive. The best weld FEA that I know is Verity from Battelle: http://www.battelle.org/our-work/consumer-industrial/battelle-verity Verity can be a module added to another FEA program, like fe-safe.
  8. CoryPad

    Aluminum embedded in concrete (yes again)

    Powdercoating meets condition a). Whether that is suitable for your application is unknown.
  9. CoryPad

    7075 aluminium

    What more information do you need regarding question 2? It is possible to re-dissolve precipitates with a solutionizing step, then quench and artificially age to produce new precipitates. Regarding question 5, here is a nice summary:
  10. CoryPad

    How to anodize steel

    You are describing a conversion coating more commonly known as black oxide. Perform an Internet search using those two words and you will find more information.
  11. CoryPad

    7075 aluminium

    1. You will liquefy a portion of the part, thereby ruining it for structural purposes. 2. Yes. 3. Not too much, this alloy frequently has large grains and still has high strength. 4. Thermomechanical processing, coupled with alloying (e.g. zirconium), are methods to reduce grain size. 5...
  12. CoryPad

    Torque requirement calculations

    faq725-536
  13. CoryPad

    Mystery white coating on battery terminals - intermetallic

    Without knowing the terminal material(s) and the species within the environment, this is a big guessing game.
  14. CoryPad

    Bolt preload definition

    I recommend reviewing some literature. Try the ones in this FAQ, especially NASA RP-1228: faq725-600
  15. CoryPad

    Cracking of 4140 During Q&T

    This appears to be a quench crack, which could be due to high concentration of phosphorus, sulfur, or other contaminants. I am not convinced that normalizing would eliminate this condition, but it may help. Have a good metallurgical analysis completed (chemical composition, microstructure...
  16. CoryPad

    MIL spec metal treatments

    Is the base material steel? I would guess electroplated zinc plus chromate conversion coating.
  17. CoryPad

    Carbon Equivalent of X65 piping

    http://ds.arcelormittal.com/repo/Technical%20Data%20Sheets/Seamless%20Pipes%20-%20API%205L%20grade%20X65%20PSL%202.pdf
  18. CoryPad

    C5-M paint requirement for die cast aluminium alloy 305/380

    Anodizing is possible, and so it powdercoating. You should preheat the casting (temperature below powdercoating curing point) to de-gas it (entrapped gas porosity is a common condition with high pressure die casting), which will prevent bubbles in the powdercoating.
  19. CoryPad

    Structural adhesive for bonding furring strips to steel wall

    In my experience, epoxy is the best adhesive for metal to metal joints. 3M Scotch-Weld products are good, and so are a variety of other products from Loctite, Sika, Devcon, etc.
  20. CoryPad

    SAW Flux Type of ERNiCrMo-3 (625 Filller)

    I have no experience with SAW, but I can recommend Special Metals Welding for alloy 625 filler: http://www.specialmetals.com/smw-product-types

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