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Recent content by jackboot

  1. jackboot

    What should be the PWHT Temperature of AISI 4130 material

    bmoorthy, I have several qualified weld procedures for 4130. However, I am assuming you are trying to qualify welding procedure - please do not weld any API 6A equipment without a proper welding procedure. 4130 and 4140 are nightmares to weld in the ASME/API coded world. You are specifing...
  2. jackboot

    Material Selection - Muzzle Blast

    mewhg, What does the Barrett .50 use? I would assume that arrangement would work anywhere since (as far as I can tell from the website) they have a large amount of impingement on their brake. As far as the insert - we use carbide in extremely abrasive/erosive gas flows. It can be cast to a...
  3. jackboot

    WELDING OF SS TUBE AISI 316 Ti

    You might check your application as well. If you weld on the 316 grade steel you could get some sensitization (spelling not sure). Basically, the heat will cause the chrome and the carbon to combine and leave you with less corrosion resistance at the HAZ. The 316L (low carbon) will remedy this...
  4. jackboot

    Puzzling Question for Stress Relief Gurus

    Thank you all very much. jackboot
  5. jackboot

    Puzzling Question for Stress Relief Gurus

    I have a theoretical question. Question: I have a hollow thin-walled cylinder. I put it in a press and plasticity deform it in the lateral direction. At this point, I have an oval shaped "cylinder." If I stress relieve this part - will the cylinder move towards its initial round shape? Or...
  6. jackboot

    Spaceballs (3d mouse)

    Everyone in my department uses the spaceball and, like ewh, it would be like losing a hand without it. Yes, I recommend it even though it is expensive. jackboot
  7. jackboot

    Using vibration to control stress during martempering

    mtnengr: I would say you know a great deal about metallurgy. Would you explain the phenomenon whereby highly stressed steel parts will slowly "stress relieve" themselves over a period of time (with no thermal stress relief)? I recognize that the time span may well be years, decades, or...
  8. jackboot

    Using vibration to control stress during martempering

    We use VSR for dimensional stability. While I can't say exactly how or why it works - there appear to be enough experts in the room to explain their opinions. However, consider we are using this to hold dimensional tolerances that are 0.0015 included (or +/- 0.00075) on a 19.75 inch...
  9. jackboot

    Mathcad for brainteaser

    Christain - sorry about the mistake. I put the actual web link on this post as soon as I saw it. meintsi - you win the cigar. How did you come up with the solution? jackboot
  10. jackboot

    Mathcad for brainteaser

    Christian - that is a real cool Mathcad sheet. I really need some training. jackboot
  11. jackboot

    Mathcad for brainteaser

    http://www.kuro5hin.org/story/2005/1/20/142742/948 This is the address to the math teaser. It says: 24 - Arithmetic - Hard Using each of the numbers 1,3,4,6 create an expression which evaluates to 24. You may use any of the four standard arithmetic operations *,+,-,/ and parenthesis. You...
  12. jackboot

    Mathcad for brainteaser

    Can Mathcad be set up to do the following: Given: 1, 3, 4, and 6 use these four numbers using any of the standard math functions (+,-,/,*) and determine the expression that will equal 24. jackboot
  13. jackboot

    Easy Question -range values

    One more question: I am getting a number for my area under the curve that doesn't seem correct. For instance, I am integrating from 0 to 360. If I change the limits to 0 to 120 - I should get 1/3 the value - but I don't. Can anyone explain what I am doing wrong?
  14. jackboot

    Easy Question -range values

    Christian - Thanks - You can't imagine how much time you just saved me. jackboot
  15. jackboot

    Easy Question -range values

    OK - That part is working now. If I have a data table with two columns - when charted I get a shape that looks like two sine curves slightly off phase of one another. I need to determine the area under the curve (integrate). I don't have an equation of curve but I have data to generate the...
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