PATON
VDI-SERIES PRO
DC MMA/TIG/MIG/MAG
-22-
100 A. As a result, the average heat input to the weld will not change. If it is required to
reduce heat input to the weld, as in welding thin parts, the welding current should be
decreased by performing the standard setting operations. In this case, current pulse
parameters will be adjusted automatically according to the set welding current, and the
operator can control the reduction of the heat input, as compared with the heat input at
the initial welding current, by simultaneously varying the current pulse amplitude and
duty cycle. The aforementioned parameters should be set differently for different welding
processes, depending on the requirements of the operator.
Operations required to set these parameters for the current welding process are described in
Section 6.1.
5. SEMIAUTOMATIC ARC WELDING PROCESS (MIG/MAG)
The welding unit can be used as a power source for semiautomatic arc welding. To be
operated in this mode, the welding unit has a special voltage-current characteristic as a
function of the unit output current against the voltage at the output terminals of the unit.
As an external electrode wire feeding unit, any independent electrode wire feeding unit
with an integrated special power supply for the unit driving motor may be used.
According to the other variant, the wire feeding unit can be designed for power supply
from the welding unit. This variant is not recommended, as in this case, the electrode wire
feeding unit cannot provide uniform and stable wire feed.
WARNING!
As a protective gas, carbon dioxide (CO
2
) should be
used in welding ferrous metals, only such inert gas as argon (Ar)
or, sometimes, helium (He) should be used in welding aluminum,
and a gas mixture, such as 70 % Ar + 30 % CO
2
, should be used
in welding stainless steels and high-alloy steels. The use of other
gases is allowed only by agreement with the manufacturer of the
welding unit.
5.1. PREPARING THE WELDING UNIT FOR OPERATION
EXTERNAL ELECTRODE WIRE
FEEDING UNIT.
IT IS RECOMMENDED TO USE A
UNIT WITH AN INTEGRATED
POWER SUPPLY FOR THE UNIT
DRIVING MOTOR
SEMIAUTOMATIC
WELDING TORCH
GROUNDING CLAMP
WORKPIECE
~230V
