Tig Welding; Operating Functions; Welding Selections; Manual Metal Arc Welding (Mma) - Kemppi Minarc 150 Operation Instructions Manual

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, thus forming a weld pool. Arc and electrode are shielded by an inert shielding
gas (Argon). If necessary, filler 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.

3.2. OPERATING FUNCTIONS

See also 2.4. Main components and 3.4. Welding selections.
A Signal light, machine ON
B Welding process selecting switch
C Welding current adjuster
D Signal light for overheating
E Suitable electrodes
Main switch and signal light
When you turn the main switch to 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
Switch is used for selecting either MMA or TIG welding, depending on welding target.
Regulating welding current
Welding current rate is regulated steplessly with an adjusting potentiometer.
Signal light for overheating
A yellow signal light of 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 potentiometer.

3.3.2. DC TIG welding

Select welding parameters according to filler manufacturer's recommendations.
1. Connect TIG torch to - pole and earth cable to + pole
2. Select TIG welding with the switch
3. Select suitable welding current by adjusting potentiometer.
3.4. WELDING SELECTIONS
Welding fumes may be dangerous to your health, see that there is ample ventilation
during welding!
Never look at the arc without face shield made for arc welding! Protect yourself and
your surroundings from the arc and hot spatter!
6 – MINARC 150, 151 / 0531
A
D
/ TIG
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B
C
E
© KEMPPI OY