No announcement yet.

question on tb302

  • Filter
  • Time
  • Show
Clear All
new posts

  • question on tb302

    Ive got a tb 302. Generally weld fc with a suitcase. My ? Is lets say i set the dial at 25 volts. Machine says ive got 100% duty cycle. However when im actually welding it may be about 19 volts. Where or what does duty cycle cover, the dial setting or actual weld voltage?

  • #2
    100% duty cycle means you can sit there with the trigger pulled and not worry about letting the magic smoke out of your generator. Has nothing to do with voltage.


    • #3
      I know what your saying...but what im driving at is ...lets say i turn the machine up to where the digital read out is 30 volts. I know at 30 volts i do not have 100% duty cycle for welding. When in an actual weld, the display will read approx 5 volts less than what i set the dial on. So is the duty cycle what i set the machine on or what the display reads during a weld


      • #4
        I would say that the duty cycle covers what the meter reads while welding.
        You set the meter at 30 volts, but because of variances in things like contact tip to work distance, it will not stay on 30 while welding it will fluctuate. Unless you are using a voltage sensing feeder. Anyhow, I would go with what you set the meter on so that you dont exceed the duty cycle. JMO

        Owner Operator of JNT Mobile Welding & Repair LLC
        Millermatic 350P Aluma Pro
        Dynasty 200DX
        Maxstar 150 STL
        Trailblazer 302
        Suitecase 12RC
        Extreme 12VS
        Extreme 8VS
        Spoolmatic 30A
        Miller HF251D-1
        Passport Plus
        Spoolmate 100
        Hypertherm Powermax 45 and 85
        Ingersoll Rand Engine Driven Compressor
        Dake 75 ton H-Frame Press
        JD Squared Model 32 Bender
        Miller Digital Elite


        • #5

          Your duty cycle is 100% cv/dc. In cc/dc the duty cycle is 100% at 280amps.
          Your volt meter setting is not connected to your duty cycle by a mechanical means.
          The duty cycle is a recommendation that should not be exceeded.
          60% duty cycle equals 6 minutes of welding in a 10 minute period.
          Weld more than the 6 minutes and you'll heat your machine up.
          Get it hot enough and you get smoke?
          That said my friend Gary used to weld all day on scrapers with a Lincoln tombstone, with 5/32 rod/electrode, and it's still going.
          Good Luck,
          Millermatic 252 w/30A
          Big Blue Air Pak
          Ellis 3000 Band Saw
          Trailblazer 302 Air Pak w/ Wireless Remote
          Dynasty 200 DX
          XMT 350 MPa w/S-74 MPa Plus
          Millermatic 211
          Passport Plus
          Spectrum 625 X-TREME
          Lincoln SA-200 Blue Tint Red Face '63
          2-Lincoln SA-200 Red Face '68
          SA-200 Black Face '59
          SA-200 Green Lite '84
          SA-200 Green Lite '80
          SA-200 Red Face '69
          SA-200 Red Face '66
          SA-200 Green Lite '81
          '70 Black Face Round Barrel