Manual no. WDT90100 Page 21
CoolTig - 220
AC balance (60-90%, default is 75%): percentage of time polarity is electrode
negative. The electrode positive cycle insures that the aluminum oxide is thoroughly
removed, allowing the electrode negative cycle a thorough penetration of the base
metal.
AC frequency (60Hz-160Hz, default 90Hz): AC frequency controls bead
width, lower AC frequency gets wider weld bead/ puddle gets wider. As AC
frequency increases, weld bead/puddle becomes narrower and the arc becomes
more focused, which can allow travel faster.
5-2.6. Press down parameter adjust knob and hold for 2-3 seconds and dial the
knob to choose 2T or 4T, and press the knob again to confirm.
2T: Pressing the torch trigger will start arc with setting current, releasing the torch
trigger will stop welding.
4T: Pressing the torch trigger will start arc at 10A start current, releasing the torch
trigger will increase the current to setting current, pressing the trigger again will
reduce the current to 10A, and releasing the trigger will stop welding.
* 2T/4T feature is not available at machines with serial no 31609060315 to
31611074146.
5-2.7.Turn on the gas valve on the torch; adjust gas volume to 3-5L/MIN. check if
there is gas leaking.
5-2.8.High frequency start: Hold the torch and keep tip of Tungsten electrode 2-3
mm above the work piece, and tilt 20-30 ˚ to vertical direction. Aim Tungsten
electrode to the welding seam. Press torch trigger to strike arc.
5-2.9.After arc is ignited, move the torch along seam evenly. Fine tune the welding
parameter to obtain exquisite welding seam.
5-2.10.After finish operation, turn off the gas valve. At the end, turn off welding power
source and wall switch.
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