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  1. ContractHome

    Accuracy of Isocircles

    Given a cube with inscribe circles on each of the faces, prove the isocircle function of AutoCAD produces a true presentation if the cube is viewed an isometric view. I tried to prove this by rotating a square with a inscribe circle along a hinge (segment bc) which would be the right vertical...
  2. ContractHome

    Connecting from NEMA L16-30P to NEMA 5-10R

    I have a welding machine which runs off of 460 volt 3 phase power and has a cord with a NEMA L16-30P. The machine has a constant voltage concerter so I was told I could automatically plug into a different voltage as long as it was the same phase power and to change phase I just would isolate the...
  3. ContractHome

    Maching Bar Stock Fittings

    If Astm B366 -S5.1 is required by the end user, then what is the concern: Does this include both boring the I.D. and turning the O.D., or is maching prohibited with no exception? What is the concern in fitting machined from bar stock and how does it differ from which are forged?
  4. ContractHome

    Flanges from round stock?

    Our fabrication standards prohibit making flanges for valves or pipe fitting from round stock? What is the difference between flanges from plate, or milled from stock? What about cutting slices from round stock that arises concerns in making flanges?
  5. ContractHome

    ASTM B164 vs. B366 Material Markings for Pipe Fittings

    When marking Monel 1" IPS Schedule 80 (Class 3000#) Socket Weld Fittings, one manufacture uses ASTM B164 while the other uses B366. The fittings are made from B164 material, but one they are machined and made into fittings, then should B366 be used vice B164. Which one would be proper for...
  6. ContractHome

    Forging Quality?

    ASTM B164 uses the term "forging quality". What is forging quality bar or rod and what is it used for? Is "forging quality material mean it has been forged to produce that quality or that it will be latter forged and is ideal for forging. When doe forging quality metal become a factor in...
  7. ContractHome

    Forging Definitions

    What is the difference between "bar stock", "forging stock" and "wrought bar"? and do these definitions change whether the metal is rolled or extruded? If forged stock is cut and turned down is it still considered forged stock?
  8. ContractHome

    Fittings and Markings-Steel and Monel

    ASME B16.11 covers forged socket weld fittings for steel but what if the fittings are machined from round stock. Is there a separate standard for machined fittings and what is it? And would that standard cover only steel or can it beapplied to machined nickel fittings also. Another...
  9. ContractHome

    Limit to rewelding monel

    If a part was welded, the welds were machined down and the part was rewelded again, then how many time can this be done. I understand each time the welding and machining changes properties in the metal, other than visual inspection is there any limits to the number of times this can be done. I...
  10. ContractHome

    Help Stop Wasting of Student Welding Materials

    We use a massive amount of material teaching our welders GTAW welding aon 1" NPS Carbon Steel Socket Welds and Also for Monel 400 NICU Socket Welds. We cut the pipe from the welds to reuse the pipe, but we are told that we must cut one inch away from the welds because the hardened metal from...
  11. ContractHome

    Tranfilling (Decanting) Gas Cylinders

    I have a one argon gas cylinder pressured at 2015psi with 80 cubic feet of argon. I want to transfer some of this argon into a small cylinder which is rated at will hold 40 cubic feet at 2015psi with a tranfill hose that has a bleed valve at the fill side of the hose. I understand I have to...
  12. ContractHome

    interpass temperature defintion

    our procedure defines weld pass as a weld bead extending the entire length of a longitudinal weld. The result of a pass is a weld bead and may include several stops and starts. the procedure definition for interpass temperature as the maximum temperature of a section of the deposited weld metal...

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