13 | P a g e
PATON
®
PSI PRO 315 A 400 V DC MIG/MAG TIG/MMA
3.6 SETTING THE SLOPE OF THE VOLT-AMPERE CHARACTERISTICK OF
THE WELDING UNIT
This function is designed to facilitate welding with electrodes with diverse coatings. By default,
the slope of the volt-ampere characteristic
[VOLT-AMPER CHARAKTERISTIC]
of the welding unit is
1.4 V/A.
This value is optimal for the most common electrodes with rutile coating. In order to facilitate
welding with electrodes with standard coating, it is recommended to set the slope of the volt-ampere
characteristic equal to
1.0 V/A
. If electrodes with cellulose coating are used, the slope of the volt-
ampere characteristic should be
0.2 … 0.6 V/A
. In this case, it is sometimes required to increase the
threshold value
[TRESHHOLD ARC FORCE]
for the reduced-voltage welding function to 18 V.
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.
3.7. SHORT ARC WELDING MODE
The short arc welding mode should be used in overhead position welding, when it is required to
prevent arc stretching. For this purpose, activate
(ON)
the short arc welding function
[SHORT ARC
MODE]
of the welding unit. By default, the function is deactivated
(OFF).
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.
3.8. REDUCTION OF OPEN – CIRCUIT VOLTAGE
When welding works with the manual arc welding process are being performed on vessels, tanks, or
other objects with higher requirements for electrical safety, it is reasonable to use the reduction of
open-circuit voltage function
[VOLT REDUCTION DEVICE]
.
When this function is activated, the output voltage of the welding unit is reduced to the safe value of
12 V
within 0.1 s after the detachment of the electrode from the workpiece.
The welding unit model is equipped with this function, it requires an open-circuit voltage reduce unit
[BSn]
but, by default, this function is deactivated
(OFF)
, as the reduction of open-circuit voltage
impairs arc starting
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.
3.9. WELDING AT PULSE WELDING CURRENT
This function is designed to simplify the control of a welding process in various spatial welding
positions, excluding a flat welding position. This function is also used in welding nonferrous metals.
When this function is activated, the application of pulse welding current improves the mixing of
molten metals in the weld area and causes forced action on the transfer of molten metal drops into the
welding pool, therefore the stability of the weld formation and the stability of the welding process are
improved. The pulse welding current in the manual arc welding process affects the weld parameters
similar to the movement of the operator hand in manual arc welding process, specifically at hard-to-
reach places. The proper adjustment of the welding process parameters in the welding at pulse
welding current has a direct effect on the weld quality, specifically reduces weld metal porosity and
decreases the graininess of the weld metal. As a result of the improved weld quality, the weld strength
increases.