PATON
VDI-SERIES PRO
DC MMA/TIG/MIG/MAG
-16-
3.4. REDUCED – VOLTAGE WELDING MODE
The advantages ensured by the reduced-voltage welding function are the following:
•
Improved arc stability in short arc welding mode
•
Improved transfer of molten metal drops into the welding pool
•
Improved arc starting
•
Reduced probability of electrode sticking (see Section 3.5)
Manual adjustment operations
allow the minimum welding voltage to be set in order
to decrease power consumption and heat input to the weld when welding thin parts. As a
result, the probability of burn-out is decreased, but the stability of arc in short arc welding
mode is also decreased, as the welding unit functions as an arc-welding transformer. It is
possible to increase the voltage reduction percentage to the maximum value in order to
improve the stability of arc in short arc welding mode (when the welding unit is connected
to a reliable power supply system), but the increased current in this mode can cause burn-
out when welding thin parts. Therefore, it is recommended to set the minimum voltage
reduction percentage.
What is achieved by:
When the arc voltage drop is lower than the minimum voltage required for stable arcing,
the welding current increases by 40 % relative to the set current.
The additional adjustment operations
allow both the welding voltage reduction
percentage
[Ar.F]
and the voltage reduction period
[u.AF]
to be set. Do not set the
increased values of these parameters if such increased values are not required, because in
the operation of the welding unit in this condition, specifically in welding with electrodes
less than 3.2 mm in diameter, electrode sticking is possible (see Section 3.5).
The procedure for changing the values of the operational parameters of the welding unit for
the current welding process is described in Section 6.1.
U (V)
I (A)
