© KEMPPI OY6 – MINARC 120, 150 / 0546
3.1.2. TIG welding
In DC TIG welding, the arc between a non-melting tungsten electrode and the work piece melts
the work piece, thus forming a weld pool. Arc and electrode are shielded by an inert shielding gas
(Argon). If necessary, filler can be used. Filler wire is fed into the weld pool from the outside of the
arc. Filler and rate of welding current are selected on the basis of diameter of tungsten electrode
and welding position.
3.2. OPERATING FUNCTIONS
See also 2.4. Main components and 3.4. Welding selections.
A Signal light VRD safe ON
B Welding process selecting switch
C Welding current regulator
D Signal light for overheating
E Table of suitable electrodes
Main switch and signal light
When you switch the main switch at the back of
machine to position I, signal light on main switch is
lit and the unit is ready for welding. Signal light is
always on when the unit is connected to the mains
and the main switch is in position I.
Note! Always start and stop the machine from the main switch, never use the plug as a switch!
Signal light VRD safe ON (A)
The machine is equipped with an OCV reduction circuit. The signal light is lit when the circuit is
activated and the unit is in working order.
Welding process selector, MMA / TIG (B)
Switch is used for selecting either MMA or TIG welding, depending on welding target. When you
have switched the unit to TIG welding, VRD is constantly active, thus reducing terminal voltage
to 30 V. This facilitates arc cut-off when you stop welding.
Regulating the welding current (C)
Welding current rate is regulated steplessly with an adjusting potentiometer.
Signal light for overheating (D)
A yellow signal light for overheating is lit when thermostat has tripped due to the unit’s overheating.
Fan will cool the unit and after the signal light goes off, the unit is again ready for welding.
3.3. WELDING SELECTIONS
3.3.1. Manual Metal Arc welding (MMA)
Select welding parameters according to filler manufacturer’s recommendations.
1. Select polarity (+ or -) of welding current cable and return current cable according to
filler.
2. Select MMA welding with the switch .
3. Select suitable welding current by adjusting the potentiometer according to table of suitable
electrodes (E).
B
C
E
A
D
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