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NOTES
21
§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 ow;
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 owing;
t6 t7 Post-gas time can be set by the post-gas time adjustment knob on the front panel
