STEALTH DIGI-TIG 320 AC/DC PULSE
2 SUMMARY
2.1 Brief Introduction
The DIGI-TIG 320 AC/DC PULSE welding machine features the latest Pulse Width
Modulation (PWM) technology and Insulated Gate Bipolar Transistor (IGBT) power
module, which can change work frequency to medium frequency so as to replace the
traditional large transformer with a medium frequency transformer – making it smaller,
portable light- weight and low consumption.
The front panel parameters can be adjusted continuously and steplessly, such as start
current, crater arc current, welding current, base current, duty ratio, upslope time,
downslope time, pre-gas, post-gas, pulse frequency, hot start, arc force and arc length
etc. When welding, it takes high frequency and high voltage for arc igniting to ensure
the success ratio of igniting arc.
DIGI-TIG 320 AC/DC PULSE Characteristics
• MCU control system responds immediately to any changes.
• High frequency and high voltage arc ignition ensures successful arc ignition ratio.
Reverse polarity ignition ensures efficient ignition during TIG-AC welding.
• Avoid AC arc-break. Even if arc-break occurs the HF will keep the arc stable.
• Pedal controls the welding current.
• TIG/DC operation. If the tungesten electrode touches the workpiece when welding,
the current will drop to short-circuit current to protect tungsten.
• Intelligent protection – over-voltage, over-current, over-heat If the problems listed
before occur, the alarm lamp on the front panel will light and the output current will
be cut off. It can self-protect and prolong the working life.
• Dual purpose – AC inverter TIG/MMA and DC inverter TIG/MMA offer excellent
performance on Al-alloy / carbon steel / stainless steel / titanium.
Front panel function selections – the following six welding ways can be realised:
– DC MMA
– DC TIG
– DC Pulse TIG
– AC MMA
– AC TIG
– AC Pulse TIG
1. For DC MMA – polarity connection can be selected according to different electrodes
(please refer to 3.5).
2. For AC MMA – magnetic flow caused by invariable DC polarity can be avoided.
3. For DC TIG – DCEP is used normally (workpiece connected to positive polarity,
while torch connected to negative polarity). This connection has many character-
istics, such as stable welding arc, low tungsten pole loss, more welding current,
narrow and deep weld.
4. For AC TIG (rectangle wave) – arc is more stable than Sine AC TIG. At the same
time maximum penetration is achieved with minimum tungsten pole loss to obtain
better clearance effect.
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