3
Principle & Technical data
ARC series Block diagram of principle (ARC series welding machines do not have HF Arc-starting device)
Power supply Output
Figure 1: Block diagram of principle
This series welding machines apply IGBT soft switch inverter technology. 3- phase input volt are rectified
by rectifier, inverted into HF AC, reduced by HF transformer, rectified and filtered by HF rectifier, then
output DC power suitable for welding. After this process, the welder’s dynamical responsive speed has
been greatly increased, so the welder size and weight are reduced noticeably result in energy saving. Power
source enjoy sound anti-fluctuating ability and high-quality performance during external context changes
(As to fluctuation in input power supply and extended welding cables).Easy to arc start, stable arc length,
pretty weld formation and capability of continuous regulation the current of welding, arc-starting, arc force
current and time of down-slope as well as remote control availability add significant values to customers.
They can also perform down-slope, pre-gas flow and post-gas flow function due to reasonable logic circuit
design.
Inverter DC arc welding machines output characteristic curve is as follows:
90-
10-
0
U
（
V
）
U= 10+0.04I
I(A)
Imin
Imax
90-
20-
0
U
（
V
）
U= 20+0.04I
I(A)
Imin
Imax
Figure 2: TIG mode Volt-Ampere curve MMA mode Volt-Ampere curve
3 phase
Rectifier
HF
Inverter
HF
Transformer
Rectifier &
Filter
Control circuit
High frequency arc start
