10 – Mastertig MLs™ 300 aCDC / 0743
© keMppi oy
3. OPERATION
Welding in places presenting an immediate fire or explosion hazard is forbidden!
Welding fumes may cause injury, take care of sufficient ventilation during welding!
3.1. WELdINg PROCESSES
3.1.1. MMA welding
With Mastertig MLS™ ACDC power sources you can use 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.
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
Electrode
Gas nozzle
Gas flow rate
dC
WC20
number
ø mm
Argon
a
ø mm
l/min
5
...80
1,0
4/5
6,5 / 8,0
5...6
70
...140
1,6
4 / 5 / 6
6,5 / 8,0 / 9,5
6...7
140 ...230
2,4
6 / 7
9,5 / 11,0
7...8
Welding current range AC
Electrode gas nozzle
Gas flow rate
min.
min.
maks.
WC20
ø mm
number ø mm
argon
a
a
a
l/min
15
25
90
1,6
4 / 5 / 6
6,5 / 8,0 / 9,5
6...7
20
30
150
2,4
6 / 7
9,5 / 11,0
7...8
30
45
200
3,2
7 / 8 / 10
11,0 / 12,5 / 16
8...10
40
60
350
4,0
10 / 11
16 / 17,5
10...12