Kemppi mastertig mls 2300 acdc Operation Instruction Manual page 13

1. MMA
Select MMA welding by pressing the MMA selection button. The indicator light next to the button
will light up when MMA is selected. The current type indicator light indicates which current is
selected: AC, DC-, DC+. Change the current type by pressing the MMA button again, and the
indicator light will indicate the selected current.
Press the QUICK SETUP button if you wish to adjust the dynamics or ignition pulse to MMA
welding. Navigate with the arrow buttons and adjust with the potentiometer. Quit by pressing again
QUICK SETUP- or RETURN-button.
1. Dynamics ("Arc" –9 ... 0 ... +9)
You will see the numerical value corresponding to the MMA dynamics in the display.
Factory setting for all electrode types is zero. You can change the value by turning the pulse
potentiometer. If numerical value is adjusted negative (-1...-9) the arc is softened, and the
amount of spatter decreases when welding at the upper end of the recommended current
range of the electrode. On the positive side (1...9) the arc is rough.
2. Ignition pulse (Hot –9 ... 0 ... +9)
You will see on the display the numerical value corresponding to the MMA hot start pulse.
You can adjust the value by turning the potentiometer. A positive value corresponds to a
more powerful pulse, with zero being the default setting.
2. TIG welding
Select TIG welding by pressing the TIG button. You can change the current type by pressing the
selection button again (AC, MIX, DC-, DC+). Selecting DC+ requires holding down the button.
According to selected current mode you can adjust parametres by using QUICK SETUP -funktion.
Quit from QUICK SETUP -function by pressing QUICK SETUP -button. At the same time you
can see recommended diameter for elektrode.
AC TIG (alternating current TIG)
Intended for welding aluminium. You can adjust, for example, the balance and frequency of
the alternating current with the QUICK SETUP and arrow buttons. The following welding
parameters can be adjusted:
1. Balance (bAL -50 ... 0, factory setting –25%)
A positive balance value breaks up aluminium oxide more effectively but heats the electrode
more than the workpiece (the tip blunts).
A negative balance value increases heat generation and penetration in the base metal, while
decreasing oxide break-up.
If you wish to increase electrode temperature when welding with a blunt-headed electrode,
adjust the balance in the positive direction, and if you wish to decrease electrode temperature
when welding with a sharp electrode, adjust the balance correspondingly in the negative
direction.
At the factory setting, the electrode tip remains almost sharp.
A sharp electrode allows welding with a narrower arc, achieving a narrower weld and deeper
penetration than with a blunted electrode. Narrow welding is especially useful when fillet
welding.
Welding with a blunted electrode produces a wide arc, which also widens the area of oxide
break-up. Application areas include repair welding and casting.
© keMppi oy Mastertig MLs™ 300 aDCD / 0743 – 13