Kemppi Minarc 150 VRD User Manual

Page 6

© KEMPPI OY

6 – MINARC 150 VRD / 0538

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 VRD safe ON

Welding process selecting switch

Welding current adjuster

Signal light for overheating

Suitable electrodes

Main switch and signal light
When you turn the main switch 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 welding current (C) Welding current rate is regulated steplessly with an

adjusting potentiometer.
Signal light for overheating (D) A yellow signal light of overheating is lit, when ther-

mostat 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.

Select polarity (+ or -) of welding current cable and return current cable according

to ﬁller.

Select MMA welding with the switch

Select suitable welding current by adjusting potentiometer according to table of

suitable electrodes (E).

3.3.2. DC TIG welding

Select welding parameters according to ﬁller manufacturer’s recommendations.

Connect TIG torch to - pole and earth cable to + pole

Select TIG welding with the switch .

Select suitable welding current by adjusting potentiometer.