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  • Users: RNDguy
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  1. RNDguy

    automating weld of fitting to a small shell

    We want to automate the process of welding internally threaded fittings of 3/4" to 1.5" OD to shells of 9" to 12" dia and of 1/8" thickness using MIG. The material of both the fittings and shell is mild steel. Any help/info/tips in this regard will be helpful. Is this even worth pursuing? Thanks...
  2. RNDguy

    WRC 107 calculation on ellipsoidal head

    To carry out external load calculations on ellipsoidal head, WRC 107 recommends to use a mean radius Rm to approximate local area as a sphere, and then use relevant graphs for spherical shell to calculate local stresses. My question is: what mean radius Rm to use? You see, on an ellipsoidal...
  3. RNDguy

    Assembly configurations in Inventor

    I use Inventor 9 currently. Ever since Inventor 6, when I first tried to create assembly configurations by using multiple iParts in an assembly and attempted to switch between different versions of an iPart to arrive at different assembly configurations, I have come up against error messages...
  4. RNDguy

    Flat of a rolled cylindrical part

    How can I make a part in Inventor which is a rolled sheet metal such that its flat pattern is linked and generated. I know this can be done possibly by using 2 folds of 180 degrees each (actually the second a little less than 180 deg to give a gap for butt-welding the longitudinal seam). But...
  5. RNDguy

    Substitution of steels with same P-number in welding

    I need to know of resources giving tips and sharing experience on the question of when is it safe to substitute a parent metal with same P-number but a different group number without bringing into question the validity of PQR & WPS. For instance, SA-414 grade C is qualified to be welded to SA...
  6. RNDguy

    Substitution of steels with same P-number in welding

    I need to know of resources giving tips and sharing experience on the question of when is it safe to substitute a parent metal with same P-number but a different group number without bringing into question the validity of PQR & WPS. For instance, SA-414 grade C is qualified to be welded to SA...
  7. RNDguy

    Compensation for openings in flat heads

    UG-39 of ASME VIII Div 1: for multiple openings in a flat head, there are rules to determine the amount of required compensation. However, it is not clear if attached nozzle material or welding can be used for this compensation. UG-37, e.g., is for formed heads and shells where such compensation...
  8. RNDguy

    Entitities drawn over viewport areas do not display

    Autocad 2002: any drawing entity (line, circle, text etc.) does not show on screen display where viewports exist on a drawing, but they display on the layout beyond viewport area. The same entities however are able to plot/print over the whole layout. Can anyone please tell me what needs to be...
  9. RNDguy

    High temperature insulation unaffected by water absorption

    Does any one know of thermal insulation workable to 1000 degrees F whose insulation value is unaffected by water absorption (note: not just high humidity)? I will be truly appreciative of any help in this regard. Thanks.
  10. RNDguy

    expanded ptfe

    I have an application where an edge trim in expanded PTFE (if such an edge trim exists) would be desirable. Is any edge trim manufactured in expanded PTFE of a shape similar to commonly available bulb-type extruded elastomer sections? I really do not know the technological limitations of making...
  11. RNDguy

    SA 234 in firetube boiler - why not?

    In Section II, A-234 grade WPB (being a carbon steel wrought short elbow) has an attached note G18. This note states that for Section I firetube boiler parts under external pressure, this fitting "may not" be used. My questions are: 1. Does this mean use of this material is prohibited...

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