PATON
VDI-SERIES PRO
DC MMA/TIG/MIG/MAG
-24-
5.2. OPERATIONAL CYCLE OF THE SEMIAUTOMATIC ARC
WELDING PROCESS
The procedure for changing the values of the operational parameters of the welding unit is described
in Section 6.1. The instant of time t1 for starting the preweld gas purging and the instant of time t2
for the post weld gas purging of the weld area should be set at the electrode wire feeding unit.
5.3. WELDING AT PULSE WELDING VOLTAGE
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
voltage improves 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 a 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.
To activate this function, it is necessary to set the following three operational parameters
of the welding process: voltage pulse amplitude
[Po.P],
voltage pulse frequency
[Fr.P],
and duty cycle
[dut].
By default, the voltage pulse amplitude is 0 [OFF], that is, the
function is switched off, the voltage pulse frequency is 20 Hz, and the duty cycle is 50 %.
To activate the function, set the voltage pulse amplitude
[Po.P]
higher than 0. The voltage
pulse amplitude should be set in percentage of the welding voltage specified for the
welding process.
t (s)
t (s)
t (s)
t (s)
I (A)
