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  • Users: robsb123
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  1. robsb123

    Equipment guarding

    It seems that there must be a standard somewhere that clearly differentiates the responsibilities of the OEM and of the user. "Either way it may be cheaper to just make the guards." We have built a lot of equipment guarding and it can be very expensive. It really depends on what the customer...
  2. robsb123

    Equipment guarding

    We quote and build a lot of custom conveyors for bulk and package handling. We are not always responsible for the installation of these conveyors and most of the time we do not know the exact location of where the equipment will be installed. As a general rule we do not include guarding as a...
  3. robsb123

    STEEL SELECTION FOR FIELD REPAIR

    I need some assistance in choosing a grade of steel We are welding a solid steel forging (4"x6" cross section) to a 1" thick A36 plate. Can anyone recommend a grade of steel that would offer maximum strength/hardness without the need of post weld heat treatment. We will be taking this piece...
  4. robsb123

    Bolt Fatigue

    The joint configuration is a large flange (94" bolt circle diameter). There are 24 bolts. The flanges are on large rotating cylinders. As the cylinder rotates it puts alternating stresses on the bolts. When the bolt is at the bottom of the rotation it experiences maximum tension. When it is...
  5. robsb123

    Bolt Fatigue

    Does anyone have any specs on the fatigue strength of grade 5 and grade 8 hardware? I have an alternating tensile load, alternating from "zero" (just the tension from the nut) to a larger positive value.
  6. robsb123

    ladder rungs made from re-bar

    We always use rebar for ladder rungs and have never experienced any problems. We always punch the side rails, and weld the ends of the rebar on the inside and outside of the rail. A punched 3/4" hole seems to give good clearance for most #6 rebar but a drilled hole is a little too tight. Be...
  7. robsb123

    CATWALK STANDARDS

    What are good standards to use for loading (PSF) and deflection (inches/span) for maintenance only catwalks.
  8. robsb123

    4140 vs 4340

    Really, I thought that 4340 was typically used for larger parts, because it was better for through hardening. What type of depth could you expect for each material at 50 HRc?
  9. robsb123

    4140 vs 4340

    This will be my last round of questions on this subject... I think. We are beveling the ring at a 45 degree angle 3/4" deep in each side. We plan to fill the groove and reinforce with a 3/4" fillet. What wire size, and corresponding voltage/amperage, do you recommend? How many passes to...
  10. robsb123

    4140 vs 4340

    Metengr, I do not do that much weld engineering on a daily basis. I am relatively young (only three years out of school with a BSME). I am working with a company that does a significant amount of structural steel welding. I would like to get a little deeper into material selection beyond the...
  11. robsb123

    4140 vs 4340

    Thank you Metengr that post was very helpful. What is your resource for this information? Is there a reference that I can buy, or is it just years of experience? How soon after welding do I need to complete the PWHT? Is the PWHT just a stress relief? This is an outdoor application. The...
  12. robsb123

    4140 vs 4340

    My firm is planning on welding some pretty thick sections of alloy steel and I wanted to get some opinions on the process. We are planning to weld 5 1/2" thick by 8" wide forged ring with an ID of 7'-6" to the outside of a cylinder. The forged ring will be alloy steel (either 4140 or 4340)...

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