Kemppi MasterTig ACDC 3500W User Manual

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MasterTig ACDC 3500W© Kemppi Oy 2021 R01
OPERATING MANUAL
2.8 TIG AC welding
AC-current is typically used when welding aluminium. We recommend for AC-welding a
WC20 (grey) or a clean wolfram electrode (green).
2.8.1 Balance
In AC-welding the ratio between the positive and negative half-cycle is called balance.
With the balance you can control heat between the electrode and work piece. When
balance is positive, it means that the positive half-cycle is longer than the negative, more
heat is coming to the electrode than to the work piece. Correspondingly when balance
is negative, negative half-cycles are longer, the work piece is hotter and the electrode is
colder. Mastertig AC/DC-machines have build-in BALANCE-automatism, which chooses
automatically right balance value. User adjusts the BALANCE-knob according to the
electrode, and the machine takes care of the balance control in dierent currents.
BALANCE automatics oers two benets as compared to a constant balance:
• In AC welding, you can use both a sharpened and a rounded (cut) electrode.
When welding starts, the machine will round the cut tip so that its is suitable.
• The current-range of the electrode is extended: the current of the lower end is
lowered and the current of the maximum end is increased.
With BALANCE automatics, you can use the position for a sharpened
electrode with a narrower arc to obtain a narrower seam and to a deeper
penetration than with a rounded electrode. A narrow seam is useful
especially in llet welding.
When using a rounded electrode, the arc is broad and the cleaning area
of the arc is also wider, so it can be used for end-to-end seams and outer
corners.
The table is only given as a guide.
Welding current range Electrode Gas nozzle Gas ow rate
min.
A
min.
A
max.
A
WC20
ø mm number
ø mm
Argon
l / min
15 25 90 1,6 4/5/6 6,5/8,0/9,5 l / min6...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). When using pure
wolfram electrode (green) the tip rounds o slightly.

Kemppi MasterTig ACDC 3500W Specifications

General

Brand	Kemppi
Model	MasterTig ACDC 3500W
Category	Welding System
Language	English