Operation; Welding Processes; Mma Welding; Tig Welding Alternating Current - Kemppi MasterTig MLS 3000 ACDC Operating Manual

3.

OperaTiOn

Welding in places presenting an immediate fire or explosion hazard is forbidden!
NOTE!
Welding fumes may cause injury, take care of sufficient ventilation during welding!
NOTE!
3.1

welDing prOCesses

3.1.1 MMa welding

With Mastertig MLS™ ACDC power sources you can use almost all electrodes suitable for direct
and alternating current welding between current limits of the power source. Both function
panels (ACS, ACX) can be used for electrode welding when MMA welding is selected.

3.1.2 Tig welding alternating Current

The Mastertig ACDC MLS™ power sources are specially designed for TIG welding aluminium
with alternating current (AC). We recommend using WC20 electrodes (grey) for AC welding.
The table is only given as a guide.
Welding current range AC
min.
A
15
EN
20
30
40
The table and the panel scale are based on the use of WC20 (grey).

3.1.3 Tig welding with Direct Current

DC welding is typically used when welding different grades of steel. We recommend using
WC20 electrodes (grey) for DC welding.
A directive electrode selection table for DC welding.
Welding current range DC
A
5...80
70...140
140...230
225...330
10
Electrode
min. maks. WC20
A A ø mm
25 90 1.6
30 150 2.4
45 200 3.2
60 350 4.0
Electrode
WC20
ø mm
1.0
1.6
2.4
3.2
Gas nozzle
number ø mm
4 / 5 / 6 6.5 / 8.0 / 9.5
6 / 7 9.5 / 11.0
7 / 8 / 10 11.0 / 12.5 / 16
10 / 11 16 / 17.5
Gas nozzle
number ø mm
4/5 6.5 / 8.0
4 / 5 / 6 6.5 / 8.0 / 9.5
6 / 7 9.5 / 11.0
11.0 / 12.5 / 16 8...10
7 / 8 / 10
Gas flow rate
Argon
l/min
6...7
7...8
8...10
10...12
Gas flow rate
Argon
l/min
5...6
6...7
7...8