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

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, fi ller 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
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 fi ller manufacturer's recommendations.
1. Select polarity (+ or -) of welding current cable and return current cable according
to fi ller.
2. Select MMA welding with the switch
3. Select suitable welding current by adjusting the potentiometer according to table of
suitable electrodes (E).
6 – Minarc 150AU / 0411
A
D
/ TIG (B)
.
B
C
E
©
COPYRIGHT KEMPPI OY