Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: bekks
  • Order by date
  1. bekks

    ASME IX PQR - bend test on PJP small diameter pipe

    It's supposed to be a partial penetration weld. I realize larger diameters or plate would be easier, but the fab shop is very non-traditional and couldn't accommodate any other size. It's in a laser welding jig that they can't easily adjust. I ended up doing extra bends (I had extra material)...
  2. bekks

    ASME IX PQR - bend test on PJP small diameter pipe

    Thanks Tensile, I did see that, but the machining it is talking about is not my issue. I believe it is referring to the reinforcement removal and/or the curvature. I am concerned about the root side that isn't penetrated through. If I bend a root bend as is, it is obviously going to open at the...
  3. bekks

    ASME IX PQR - bend test on PJP small diameter pipe

    I am helping a fab shop qualify a WPS and I realize there are other easier ways of doing this, but I have the weld coupons in hand and am going to test them. I'm looking for advise on root bend tests. Here are the details: 7/8" diameter pipe with 0.125" wall thickness. Partial penetration weld...
  4. bekks

    Sigma phase in 2205 duplex

    I'll look into those curves Ed. MagBen, the sample was evaluated prior to heat treatment and looked clean - no notable carbides nor the grain boundary sigma. There was a fair bit of carbides after heat treating, in other regions of the cross-section.
  5. bekks

    Sigma phase in 2205 duplex

    I should have further explained. I had a sample lying around that I wanted to see if I could force sigma, so I threw the sample in with another heat treatment (carbon steel). That said, I do somewhat regularly talk to clients that insist that they need to PWHT austenitic SS parts. I try to talk...
  6. bekks

    Sigma phase in 2205 duplex

    Thanks for the reply MagBen. This sample was PWHT at 620°C for 2 hours, so right at the bottom end of potential sigma formation.
  7. bekks

    Mitigate strength reduction when welding after heat treatment

    Sorry, I don't quite get the design issue (my own ignorance, or I don't follow what you've described), but in terms of welding and losing strength - you are going to likely gain strength in the chromoly shaft you use, at the expense of ductility. PWHT is done to temper/soften/stress relieve the...
  8. bekks

    Welding 310 stainless steel with ER308/308L

    What is the shell? 310 as well? Is your design temperature up to 1000F? or a ways below it. You could be in the sensitization range, in which case the 308L won't be as resistant to sensitization as the 310.
  9. bekks

    Sigma phase in 2205 duplex

    Anyone with experience looking at sigma phase able to give an opinion on whether or not this is it starting at the grain boundaries? Midwall of a 0.5" thick plate; around the edge of the HAZ. Etched with 20% oxalic for about 20 seconds at 5V. 250X magnification. I'm wondering about the "growths"...
  10. bekks

    Chromium carbide overlay microstructure

    Thanks for the thoughts. I've got an OK to do an EDS analysis, but it might take a couple weeks. I'll try to remember to get back on here with the results.
  11. bekks

    Chromium carbide overlay microstructure

    I agree. They have very fast cooling rates on their first layer and don't precipitate any primary carbides. But it is the same wire composition for both layers. I was given another sample to look at today from a different manufacturer. I don't have the chemistry yet, but assume it is still in...
  12. bekks

    Chromium carbide overlay microstructure

    Good suggestion. I'll look into an option for a size criteria in the software.
  13. bekks

    Chromium carbide overlay microstructure

    This is getting to the root of my question Ed. Our image analysis (via software counting pixels in a two tone image) cannot differentiate this "phase" from M7C3s. A typical image analysis count is 30 - 45% "white" and I estimate that this ordered phase accounts for up to 10% of that white count...
  14. bekks

    Chromium carbide overlay microstructure

    Thanks MagBen, I've attached another photo (still 100X mag) of the interface between the first and second layer. The ordered phase appears to grow in size as you move from the interface to the surface. This growth is what leads me to think that it may be primary M7C3 (or another composition?). I...
  15. bekks

    Chromium carbide overlay microstructure

    Chromium carbide welded with mechanized FCAW. I don't have the welding parameters, but it is an an as-welded production test, so no service. Chemistry of the deposit is around 30% Cr and 5% C.
  16. bekks

    Chromium carbide overlay microstructure

    I tried to attach two micro photos, but I think only one is being attached. There is no scale bar, but it is taken at 100X magnification with Vilella's etchant. This micro is taken at the mid-thickness of the second layer of a CCO. I've circled two regions in yellow that I am curious about. I am...
  17. bekks

    MTR: Stress relieving following tempering (following quenching)

    Thanks for the thoughts. Tempering temperature was around 1300F, as you assumed Ed. The finished material was 6" diameter bar stock. When I said manufacturer I should have maybe said "mill".
  18. bekks

    MTR: Stress relieving following tempering (following quenching)

    Thanks Ed, I looked through about 10 MTRs that I had handy and noticed the second heat treatment on two. The one I'm interested in is 84/107 ksi (yield/UTS) actual values. I also noticed it had a relatively high vanadium value of 0.012%, which I would expect to require a longer temper.
  19. bekks

    MTR: Stress relieving following tempering (following quenching)

    Could someone explain to me why "stress relieving" is sometimes performed after quench and tempering by the manufacturer? The material in question is 4130. I've noticed that sometimes the MTRs state a stress relief at slightly lower temperature, but similar time to the temper temperature and...
  20. bekks

    GS-18NiMoCr3-X - Looking for cast steel specification

    Thanks mrfailure. I agree the discussion took a turn, which was my own doing. I realize that the 4130 discussion was not related to the GS-18NiMoCr3. The GS-18NiMoCr3 is being used as a support structure and I'm fairly confident it is cast. My question was where I could find a specification...

Part and Inventory Search

Back
Top