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  1. #1
    Join Date
    Jan 2012
    Posts
    28

    Default Mig - volts versus amps

    On virtually every mig, the "wire feed" and amps adjustment is one and the same. Turning up the speed increases heat.

    So, on machines with adjustable voltages (i.e. Miller 252), what is the effect of increasing voltage only.

    Let's say the setting for 3/16 steel is 18.4 volts/265 FPM. What happens if the volts are increased to, say, 18.8?

  2. #2
    Join Date
    Dec 2007
    Location
    Los Angeles
    Posts
    2,864

    Default

    It changes the Amps.

    Ed Conley
    http://www.screamingbroccoli.net/
    MM252
    MM211
    Passport Plus w/Spool Gun
    TA185
    Miller 125c Plasma 120v
    O/A set
    SO 2020 Bender
    You can call me Bacchus

  3. #3
    Join Date
    Jan 2012
    Posts
    28

    Default

    I was hoping for a little more detail.

  4. #4
    Join Date
    Dec 2007
    Location
    Los Angeles
    Posts
    2,864

    Default

    Ed Conley
    http://www.screamingbroccoli.net/
    MM252
    MM211
    Passport Plus w/Spool Gun
    TA185
    Miller 125c Plasma 120v
    O/A set
    SO 2020 Bender
    You can call me Bacchus

  5. #5
    Join Date
    Oct 2005
    Location
    North Central Indiana
    Posts
    782

    Default

    Volts is pressure, so increasing voltage I would say creates a deeper weld....

  6. #6
    Join Date
    Dec 2011
    Posts
    392

    Default

    Extract from "The Procedure Handbook of Arc Welding"- Lincoln Electric 1995.
    "Four major variables affect welding performance with flux core electrodes: arc voltage, wire feed speed rate, travel speed and electrical stickout. These variables are interdependent, and. if one is changed, one or more of the other three usually requires adjustment.
    Arc voltage variations, with the wire feed speed (current), travel speed, and electrical stickout held constant, produce the following effects:
    1. A high arc voltage produces a wider and flatter bead.
    2. An excessive arc voltage may produce a porous weld.
    3. A low voltage tends to cause a convex , ropey bead.
    4. Extremely low voltage may produce a tendency for wire to stub onto the plate.The wire may dive though the molten metal and strike the joint bottom, pushing the gun up.
    In most applications, a good bead shape is obtained by using the highest voltage possible without causing porosity. With higher wire feed rates, higher voltages can be used without causing porosity."
    Some people seem to want volt meters and ammeters on their mig equipment but I would suggest that they are no more useful than keen observation of the weld bead characteristics and noting the exact positions of the wire feed speed and the voltage control or taps for future reference. Meters are just another reference point and neither volt meters nor ammeters gives a useful reading until you are welding when you can't look at them. Maybe a talking meter would be more useful but really the story is told in the weld bead.
    Meltedmetal

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