Top Gun TIG 320 AC/DC, Руководство оператора

Страница: 22 / 35

MAINTENANCE AND TROUBLESHOOTING
20
§4.4 Argon Arc Welding Operation
§4.4.1 TIG welding
（
4T operation
）
The start current and crater current can be pre-set. This function can compensate the
possible crater that appears at the beginning and end of the welding. Thus, 4T is suitable for the
welding of medium thickness plates.
Introduction
：

0
：
Press and hold the gun switch, Electromagnetic gas valve is turned on. The shielding
gas stars to flow;

0
～
t1
：
Pre-gas time (0.1~1S);

t1
～
t2
：
Arc is ignited at t1 and then output the setting value of start current;

t2
：
Loosen the gun switch, the output current slopes up from the start current;

t2
～
t3
：
The output current rises to the setting value (Iw or Ib), the upslope time can be
adjusted;

t3
～
t4
：
Welding process. During this period, the gun switch is loosen;
Note: Select the pulsed output, the base current and welding current will be outputted alternately;
otherwise, output the setting value of welding current;

t4
：
Press the torch switch again, the welding current will drop in accordance with the
selected down-slope time.

t4
～
t5
：
The output current slopes down to the crater current. The downslope time can be
adjusted;

t5
～
t6
：
The crater current time;

t6
：
Loosen the gun switch, stop arc and keep on argon flowing;