13
t1
：
Striking arc and output start current (the setting value is 5A).
t2
～
t3
：
Loosen the gun switch and the output current will drop according to the
pre-set time.
t3
：
Stop arc and argon still keeps on;
t3
～
t4
：
Post-gas time. It can adjust automatically according to the welding current.
t4: Argon stops to flow. Welding is finished.
The operation step of scraping arc:
1. Touch the tungsten electrode with workpiece.
2. Press the welding gun.
3. Lift the welding gun and strike arc.
Anti-electrode pickup:
①
TIG: During the welding operation, if the
tungsten electrode touches the workpiece to form
short-circuit, the protection mode will be transferred
automatically and the welding current will drop to the protection current to reduce the waste
of tungsten electrode and prolong its usage time.
②
MMA:
During the welding operation, if the electrode touches the workpiece to form
short circuit, after 2s, the welding current will drop to 0A to void the electrode getting red.
Automatically gas test function: When TIG welding, turn on the machine switch and open the
gas valve to output shielded gas and maintain 10 seconds.
§4.4.2 Striking arc way for MMA
Knocking arc: take the electrode upright to touch the workpiece, after forming short circuit,
quickly lift up about 2~4 mm, and arc will be ignited. This method is difficult to master. But
in the welding for the brittle or hard steel, it is better to use knocking way.
electrode
workpiece
electrode
electrode
workpiece
workpiece
Take the electrode upright
The Electrode touch the workpiece
Lift up for about 2-4mm
upright
up
touch
2
～
4mm
Fig 4.7 the method of knocking arc
Fig 4.6 the operation of lift arc
