How many amps for 1/4 or 3/8 material
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  1. #1
    Join Date
    May 2008
    Posts
    202

    How many amps for 1/4 or 3/8 material

    Im doing some figuring on duty cycle of some different Mig machines which are all based on output amps. Millermatics, Powermigs etc.

    About how many amps do you run on 1/4 mild steel and for 3/8 when your mig welding? Tell me what machine your using also if you don't mind.

    Usually there is a chart on the inside of the machine but I haven't went and looked at any yet.

    Also if anyone has ever done 1/2 mig welding. What amps are you using.

  2. #2
    Join Date
    May 2007
    Location
    MI
    Posts
    91

    Re: How many amps for 1/4 or 3/8 material

    Chad,

    GMAW mild steel in the short circuit transfer.

    1/4" base, 1 pass, .035 wire, 19-21 volts, 140-160 amps, wire feed speed 280-320 in./min., gas flow 25 CFH 75% argon 25% Co2, travel speed 10-15 in./min.
    for flat and harizontal, reduce by 10-15% for vertical up and overhead.

    3/8" base, 1-2 passes .035 wire 19-21 volts, 150-160 amps, wfs 290-320 in./min., gas flow 25 CFH Co2, travel speed 6-7 in./min. vertical up

    1/2" base, 2-3 passes .035 wire, 20-22 volts, 160-170 amps, 320-350 in./min., 25 CFH Co2, TS 5-6 in./min.

    getting into 1/4"-3/8" and above base you can bevel the weld joint and decrease the amps/wire speed to 110-130 amps 190-240 in./min. this will be a multi pass weld. The above settings do not take into account a bevel. I use a Lincoln SP-130T 220 v input @ 170 welding amps MAX
    Hope this is of some
    Waldo

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