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  1. teb1

    Constant Temperature creep.

    I am trying to model the phenomenon of the initial start of plasticity in A-36 plate. Specifically, I want to see strain increase at a constant pressure or force until the strain reaches the point that kinematic hardening starts to take over. I am using Simulation Mechanical 2018 and Inventor...
  2. teb1

    Advice on welding 8630 casting

    I have a project where the initial metalurgical sample indicated a rather "soft" steel casting with a fairly low hardnes,83HRB. I submitted a larger section for analysis and the larger section showed a much higher hardness away from the surface ,253HRB, and therefore a higher tensile strength...
  3. teb1

    cyclic symmetry in ALGOR static/linear analysis

    Steve, In the FEA editor, create a cylindrical coordinate system for the 120 degree segment of your model. Then apply the appropriate cylindrical coordinate system boundry conditions to the appropriate faces. Hope this helps. Tommy
  4. teb1

    Stress Relief vs. Normalization

    dbooker630, I tried the "blank" equipment a couple of years ago on a large gear that I was doing a weld repair on. The kindest thing that I can say about it is that I wasn't satisfied. Believe me they make some wonderful claims, but if method really worked as well as they say, I think the...
  5. teb1

    Stress Relief vs. Normalization

    Thanks everyone. I really appreciate the input and advice. Tommy
  6. teb1

    Stress Relief vs. Normalization

    Metengr, What would be the lower transformation temperature of ASTM SA-36 material? Bkluaba, I have researched vibratory stress relief in the past. I never could find definitive proof that it worked. There are testimonies and statements but I have never seen hard data such as before and...
  7. teb1

    Stress Relief vs. Normalization

    As I said this is not a code vessel part. I just want it stablized so that it stays dimensionally stable during the machining process. I didn't know about having to re-test for the mechanical properties after normalization thanks for that info. I wouldn't be able to re-cert the material...
  8. teb1

    Stress Relief vs. Normalization

    I am welding a 3" thick x 70" OD tube x 48" long. This piece will be machined afer welding on the OD and ID. This is not a code pressure vessel part. Since I want to machine it after it is welded and I don't want it "walking around" during the machining I am debating whether to specify a...
  9. teb1

    How can I determine the depth of cracks in a cast iron linear slide

    What I would do if you called me to repair these would be to "profile drill" along the length of the crack if the geometry of the piece allowed for it. First spray the cracked surface with dye penetrant and allow it to dry. Then drill into the crack with a 7/32" drill bit. Drill approximately...
  10. teb1

    Welding AISI 4145

    To all that responded to the above thread, thanks for the advice. I happy to report that we (I and two of my techicians) finished the welding of the gear rim last week. There turned out to be four locations that required extensive repairs. As pointed out there was a significant difference in...
  11. teb1

    Welding AISI 4145

    Unclesyd, Can you give me a quick synopsis of why Allstate 275 would be superior to 7018 or 8018? I am running an FEA of the gear rim assembly right now. If the normal operating stresses in the rim are alarmingly high I will have to look at the possibility of using a higher strength...
  12. teb1

    Welding AISI 4145

    Thanks, Metengr, I can tell you from chipping this material after the arc gouging that it is hard!!! A little more gringing is going to be necessary in order to just smooth out the contours in the weld bevel geometry. We are going to be using electric thermal blankets for the preheat and to...
  13. teb1

    Welding AISI 4145

    Metengr The rim has been dye checked. There are four (4) main crack locations. There is serious spauling on the pitch line of the individual teeth on one side of the herring bone. There is no doubt serious sub cracking under the spauling. My problem is not why this gear failed, or any sub...
  14. teb1

    Welding AISI 4145

    I have a herringbone type gear rim that has multiple crack locations on only one side. The cracks are initiating at the pitchline of the gear tooth and severing the gear's rim. The gear was originally a fabrication. The rim is 4145 forging while the interior support plates are A-36. The root...
  15. teb1

    Cylinder Roll Length

    Thanks again for the responses. The can thickness to Outside radius concerns me also. That is why I posted the question. When I get back home I am going to review some of my references to find the formula that we used to use. I don't recognize the one that was posted above. Again, thanks...
  16. teb1

    Cylinder Roll Length

    Thanks for the quick response, but please clarify. Please define "I" and "D" as used in the above formula. Are you saying Cut length= pi x mean diameter + 8/9 x plate thickness? mean diamter = (Outside Diameter + Inside Diameter)/2 Thanks, teb1
  17. teb1

    Cylinder Roll Length

    As you get older you start to forget! Would someone in this forum be kind enough to remind me as to what the formula is for figuring out the pre-roll cut length of a plate to be rolled into a cylinder of a specific diameter? I am rolling a 2 1/4" thick plate to approximately 37.5" outside...
  18. teb1

    Welding of Gr. 5 and/or A325 Bolt

    This may be over kill, but why don't you tap the hole through which the bolt is going to pass through, screw the bolt in from the back side and then "tack" weld the bolt head to the back of the plate? tommy
  19. teb1

    Tightening bolts to 90% yield stress.

    "If an external load that tends to separate the members is applied, some of the compression on the plates will be relieved. (I agree) In turn, some of the tension on the bolt will be relieved. (I disagree!) " Please elaborate on this, RJCJR9. Thanks.
  20. teb1

    Wrought Iron Bridge Repair by Welding

    Sorry 'bout that. Try the thread listed below with regard to a cast iron turbine case repair. thread725-116788

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