EN
3. OPERATION
NOTE! Welding in places presenting an immediate re or explosion hazard is forbidden!
NOTE! Welding fumes may cause injury, take care of sucient ventilation during welding!
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 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
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 dierent grades of steel. We recommend using
WC20 electrodes (grey) for DC welding.
A directive electrode selection table for DC welding.
Welding current range DC Electrode Gas nozzle Gas flow rate
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
225...330 3.2 7 / 8 / 10
11.0 / 12.5 / 16 8...10
10
MasterTig MLS 3000, 3003 ACDC / © Kemppi Oy / 1112
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