Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by mcprofusion

  1. mcprofusion

    Welding to Cast parts on a Backhoe

    Nothing special..a little wire brushing and preheat(120C) doesn't hurt.. MC PROFUSION Toronto, Ontario, Canada Website: www.mcprofusion.com
  2. mcprofusion

    Industrial Spot Welder - Distributors ?

    I require sales quotes on Industrial Stand-Up type spot welders. I would appreciate any leads for distributors and/or rebuilders of such equipment; sales leads located in my area would be a bonus. Thank for your time ! MC PROFUSION Toronto, Ontario, Canada Website: www.mcprofusion.com
  3. mcprofusion

    Joining Copper Tubing

    I concur with CWIC that you must carefully review the current process. Eliminate current manufacturing issues and identify your quality requirements. Bad welders don’t justify automation…....get them help! ;) If your still considering some type of automation, then your application needs to be...
  4. mcprofusion

    Post-weld Heat treatment specs for Hi-temp alloys

    Good question..i did some quick research and found this: 718 welded in the aged condition > The excessive softening of the HAZ due to solutioning can result in cracking in the areas adjacent to the weld metal. This is because, owing to the softening of the HAZ, these areas become the weakest...
  5. mcprofusion

    FCAW wire for thick walled pipe

    Just to clarify the WF speeds above were used in the 1G position. For an UH fill I would probably start 200-250 wfs 26-28 volts. MC PROFUSION Toronto, Ontario, Canada Website: www.mcprofusion.com
  6. mcprofusion

    weld seam corrosion

    Diffusion rates of carbon and chromium are much higher in b.c.c (ferrite) than f.c.c. (austenite) lattice. In ferritic SS rapid cooling from above 925C does not really supress the precipitation of chromium carbide at the grain boundaries. For the same reason, lowering the carbon content does...
  7. mcprofusion

    FCAW wire for thick walled pipe

    I would recommend employing FCAW for all Fill/Cap Carbon Pipe Welding, 045 wire with a C25 gas mix, which will produce minimal fumes. Our weld quality was extreme and very cost effective(4"Dia-200 / 8"up-330wfs). FCAW can lay a good bead even on 20" Dia and up. On big dia. your...
  8. mcprofusion

    alloy 20 tube to tube sheet welding

    You are using the recommended filler 320LR. Start and stops are critical on this material, craters must properly filled; and make sure yor getting enough gas Pre and Post-flow. Do you see any benefit from using pusle ? why not straight DCEN tig ? Weld heat input must be keep to miniumum, to...
  9. mcprofusion

    Job Estimating - Piping Systems ?

    Seasons Greetings ! I was hoping to get a few helpful leads on proper job estimating techniques used in industrial pipework contracting; job costing for pipefitting, welding, and installation. I have been in the piping industry for some time as a welder and pipefitter, and i understand that...
  10. mcprofusion

    miller 451 power supply running away with the amps

    What type of robot is it ? (MotoMan, ABB, Fanuc, etc..) I had a similar problem like this once. A control parameter might be switched, so your actually typing in AMPS required and not WFS ?...EVEN IF YOUR SREEN SAYS WFS INPUT Your PS is CONSTANT VOLTAGE = Current adjusts to maintain a...
  11. mcprofusion

    Isothermal Transformation Diagrams ?

    Thanks...greatly appreciated TVP !
  12. mcprofusion

    Isothermal Transformation Diagrams ?

    I am trying to locate TTT curves for various materials specs. Would anyone know where i can find these "Online" and/or a recommend a good atlas for purchase ? Thanks Marc www.mcprofusion.com
  13. mcprofusion

    hobart welding machine problem

    http://www.hobartwelders.com/talk/ marc www.mcprofusion.com
  14. mcprofusion

    HAZ - Heat Affect Zone for Spot Welds

    TVP > nailed it dead on from a metallurgical view.
  15. mcprofusion

    HAZ - Heat Affect Zone for Spot Welds

    Why do you want to measure the HAZ ? Are you concerned about HAZ's are overlapping ? Shouldn't you be more concern about producing an acceptable spot weld of required strength. How about a detructive test ? There are a few different types of destructive tests you can perform. Marc...

Part and Inventory Search