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is called the finish current, which should be determined according to the process
requirements.
● Pre-flow time (t0): Refers to the time from pressing the torch trigger to sending argon gas to
arc starting. Generally, it should be greater than 0.5s to ensure that the gas has been sent to
the welding torch at normal flow when discharging arc initiation. It should be increased when
the gas pipe is long.
● Post-flow time (t6): Refers to time from cutting off the welding current to turning off gas the
valve in the welder. It should be determined according to the usage conditions and process
requirements; too long will cause waste of argon gas, but too short will cause oxidation of the
weld.
The parameters are set as follows:
Enter DC TIG mode, and press the encoder to select the welding parameter to be set. If the
parameter indicator is on, it indicates that the parameter is selected.
Press the encoder once. If the indicator is on, it indicates that the parameter has been
selected for configuration; rotate it clockwise to increase the value, and counterclockwise to
decrease the value.
After setting the parameter, press the encoder again to save the current settings, and the
parameter indicator will change to always on.
Set all the welding parameters according to the above steps.
Choose the appropriate welding current, tungsten electrode, and shielding gas flow based on
the welding requirements. Refer to the Table 7-3 for details.
Table 7-3 Stainless steel plate-selection of parameters for manual TIG arc welding
Tungsten
diameter
(mm)
Thickness of
stainless steel
plate (mm)
Maximum current
(A)
Maximum argon
flow rate (l/min)
1~2
1~3
50
5
50~80
6
2~4
3~6
80~120
7
121~160
8
161~200
9
201~300
10
7.2.6 DC TIG welding
Open the gas valve on the gas cylinder, adjust the argon gas flow, and realize TIG welding by
lift arc starting or HF arc starting.
During welding:
1) The TIG parameter indicator changes with the welding state
2) If the parameter indicator is in initial current, peak current, or finish current, directly press
the encoder to adjust the value, and the parameter indicator will flash
3) If the parameter indicator is in pre-flow time, up-slope time or down-slope time, the value
cannot be adjusted, and operations on the encoder will not be effective.
After welding, release the torch trigger to extinguish the arc.
Note!
When starting the arc, if the short-circuit time exceeds 2 seconds, the welder
turns off the output current. Lift the welding torch to restart the arc again.
Summary of Contents for TIG200
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