Kemppi MLS 3000 ACDC VRD User Manual

Page 15

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 control

knob. 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 ignition pulse.

You can adjust the value by turning the control knob. 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 -function. Quit from QUICK SETUP -function by pressing QUICK SETUP

-button. At the same time you can see recommended diameter for electrode.

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 %)

In AC welding the ratio of the positive and negative half waves is called the balance. It

determines the heat input proportions to the base material and to the electrode.

effect of the balance adjustment:

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 welding a fillet weld.
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.

2. Frequency (Fre 50 … 250 Hz, factory setting 60 Hz)

Raising the frequency will make the arc slightly more stable and narrow, but it will

increase the noise caused by arc.

3. selection of aC waveform, sine or square wave (sinus/square)

The waveform affects the noise level and penetration of the arc. A sine waveform

generates a lower noise level, while a square wave has better penetration (factory setting).

4. Hot start time for the 2T function (H2t 0.1 s…5.0 s, factory setting 1.0 s)

Pre-heating timer for the 2T switch function. The workpiece can be pre-heated (Hot Start)

with both AC and DC currents. The time set here remains in effect for DC TIG current types.

ast

Tig MLS 3000, 3003 A

y / 1112