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Thread: Inductance

  1. #1
    Join Date
    Jul 2011
    Location
    Berowra Waters
    Posts
    149

    Default Inductance

    So I’ve been watching some YouTube videos about mig welding, and the yanks keep talking about “inductance”, and I’ve never heard of it. What is it? And what do we call it here? Thanks.

  2. #2
    Join Date
    Aug 2008
    Location
    Adelaide
    Age
    68
    Posts
    1,373

    Default

    We also call in inductance, it's a standard electrical term. In terms of GMAW welding the level of inductance affects the rate of current rise in short-circuit mode. The effect is quite subtle but higher levels of inductance can make the arc "softer".

    Not all GMAW machines have adjustable inductance, mostly only industrial machines and the high end inverter based units.

    I would think that in the 30 years I've had my current machine I've only changed the setting a couple of times, mine only has 2 settings.

  3. #3
    Join Date
    Nov 2019
    Location
    Brisbane
    Age
    69
    Posts
    452

    Default Welder inductance

    Hello from Ol Steamer.
    Years ago the inductance control was called slope. That described the slope of output voltage after the wire contacted the work and during wire pinch off. The old migs had a handle that moved a carbon brush assy across a flat armature altering the number of output choke coils in use.
    Inverter welders call it inductance. In mig welding changing effective inductance changes the penetration profile of the weld. At one end it will give max penetration and the other end gives all build up. When stick welding the control changes arc force. The closer to the job the rod gets the more voltage supplied to maintain the arc. When using type 11 electrodes this can cause arc out as the electrode burns up into the flux. Better welders allow the arc force to be turned off for cellulose rods or have a panel selection to use for them.
    In my early years a secondary choke was used to trim welder output for fine settings. It was half a dozen turns of the earth lead around a steel bar.
    On some of the cheaper 3 in 1 welders inductance won't work for all processes.
    Regards
    BC

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