Selecting The Gun Operating Mode; Adjusting The Shielding Gas Flow - Kemppi FitWeld 300 Operating Manual

2.6.3 Selecting the gun operating mode

With the three position switch (1) you can set the MIG welding gun to two-sequence (2T) or
four-sequence (4T) mode with GasGuard feature on.
If you are using self-shielded flux-cored filler wire (gasless wire), you must select the upmost
switch position. This position provides 2T operation with GasGuard feature disabled, allowing
welding without shielding gas.
To use the welding gun in 2T operating mode:
1. Press the gun trigger down to start welding.
2. Release the gun trigger to stop welding.
To use the welding gun in 4T operating mode:
1. Press the gun trigger down to start the flow of the shielding gas.
2. Release the trigger to start welding.
3. Press the trigger down again to stop the arc. The shielding gas continues to flow.
4. Release the switch again to stop the flow of the shielding gas.

2.6.4 Adjusting the shielding gas flow

Using a rotameter as shown in the picture, you can adjust the gas flow rate to the gun by
turning the shielding gas adjustment regulation valve screw inside the FitWeld 300 wire
cabinet.
By turning the screw anticlockwise you increase the gas flow to the gun nozzle. Clockwise
adjustment will reduce the gas flow rate.
20
15
10
5
l/min
The shielding gas flow rate set from the gas cylinder regulator must exceed the flow rate
NOTE!
measured at the welding gun. If these rates are the same, the gas indication light will shine on the
control panel and welding is prevented.
© Kemppi Oy / 1202
EN
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