HandyTig HT200 AC/DC - What is "Plus Pole Current Correction"?

  1. no idea Member

    Messages:
    143
    I'm starting to have a play with the sub-menu on the Lorch HandyTig HT200 and am comfortable with most of the parameters and their adjustments (AC and pulse frequency, balance, upslope/downslope etc.) but am not sure what the following does:

    Plus Pole Current Correction (code 11P in the menu) - the description in the manual is "Ignition using the positive terminal is used for optimum dome formation in TIG AC welding. This positive terminal current is preset in the unit and can be increased or reduced by the quoted percentage." and has an adjustment range of 10% to 200%.

    I understand the % setting to be the % of the welding current but the bit about the positive terminal doesn't make sense to me. Playing around with different settings doesn't seem to make any or much difference.

    Can anyone give some guidance on this and when adjustments are needed? I'm quite happy to leave it as is because I've found all the default settings to be spot on but I would like to understand the machine settings and capabilities better.

    Also, Is this something unique to Lorch or is it something that is common but named differntly on other machines?
     
  2. Richard.

    Richard. Forum Supporter

    Messages:
    18,349
    Location:
    Cambridgeshire
    Leave it around 60-70%
    It’s a cap shaping function.
    So when you strike up it will give you a breif burst of extra positive polarity which which will momentarily melt the electrode to ball it or dome it. You will get a bigger ball with the higher % you apply. It’s function is purely do one job and that’s to give you the ability to vary the size of the ball on the electrode and this only happens at strike up.
    I like it set at 60-70%. This keeps the ball size way down below the diameter of the tungsten :thumbup:
    Play with it from both extremes and you’ll soon see what it’s doing.
    Nice machine by the way. I’ve got a soft spot for those HandyTIG sets.
     
  3. no idea Member

    Messages:
    143
    So that's why I got this previously - I thought I was running too much current through it :welder:

    That makes sense now.

    20190529_212308.jpg
     
    Richard. likes this.
  4. Richard.

    Richard. Forum Supporter

    Messages:
    18,349
    Location:
    Cambridgeshire
    Combination of that setting and possibly balance too
     
  5. Brad93

    Brad93 M J B Engineering

    Messages:
    8,518
    Location:
    Essex
    If you’re using a 1.6 tungsten I’ve turned it right down to 50%
     
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