©
COPYRIGHT
KEMPPI
OY
6 – Minarc/0244
3. USE
It is forbidden to weld in places where is a danger of
fi
re or explosion!
3.1. WELDING PROCESSES
3.1.1. Manual Metal arc welding (MMA)
In manual metal arc (MMA) the welding
fi
ller material is melted from the electrode to
the weld pool. Filler and rate of welding current is selected on basis of used electrode
size and welding position. Arc forms between electrode end and welding piece. The
melting electrode coating forms gas and slag, that protects the weld pool. Slag solidi
fi
ed
over the weld is removed after welding with e.g. a chipping hammer.
3.1.2. TIG welding
In DC TIG welding the arc between a non-melting tungsten electrode and the welding
piece melts the welding piece, where weld pool forms. Arc and electrode are shielded by
an inert shielding gas (Argon). If necessary,
fi
ller is used. Filler wire is fed into the weld
pool from the outside of the arc. Filler and rate of welding current is selected on the
basis of diameter of tungsten electrode and welding position in use.
3.2. OPERATING FUNCTIONS
See also 2.4. Main components and 3.4. Welding selections.
A Main switch and signal light
B Welding process selecting switch
C Welding current adjuster
D Signal light on overheating
Main switch and signal light
When you put the main switch in position I, signal light 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!
Welding process selector, MMA
/ TIG
switch is used for selecting either
MMA or TIG welding, depending on welding target.
Regulating welding current
Welding current rate is steplessly regulated with an adjusting potentiometer.
Signal light for overheating
A yellow signal light of overheating is lit, when thermostat has tripped because of 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 based on
fi
ller manufacturer’s recommendations.
1. Select polarity (+ or -) of welding current cable and return current cable in
accordance with
fi
ller.
2. Select MMA welding with the switch .
3. Select suitable welding current on adjusting potentiometer scales.
B
A
D
C
