PATON
PRO-315
MMA/TIG/MIG/MAG
-22 -
5.3 PULSE VOLTAGE WELDING FUNCTION
This function is intended to facilitate the welding process control in spatial
positions other than the lower one, as well as during non-ferrous metals welding.
The impact occurs directly on the mixing of the molten weld metal and on the
transfer of the drop into the weld pool, and this in turn affects the stability of the
weld formation and the welding process. In other words, this process to some
extent replaces the welder's hand movements, this is especially applicable when
welding in hard-to-reach places. The weld formation shape and quality depends on
the correct function setting, which reduces the likelihood of pores and reduces the
structure graininess, which in turn increases the welded joint strength.
To implement this function in the machine, you need to set three parameters:
pulsating power [Po.P],
pulsation frequency [Fr.P] and filling factor (or “duty
cycle”) [dut]. By default, the pulsating power [Po.P] as a key parameter is in the
“OFF” position, i.e. the function is turned off, and the pulsation frequency [Fr.P]
and “duty cycle” [dut] are at the
most common values of 20.0 Hz and 50%,
respectively . To enable the function, it is enough to set the pulsating power [Po.P]
greater than zero. This parameter is set as a percentage of the existing main
welding voltage set.
Example: 0.8 mm wire welding, wire feed speed set at 5.5 m/min, the base welding
voltage value set is 18 V, and the pulsating power [Po.P] = 20%, and the pulse
frequency [Fr.P] = 20 Hz and “duty cycle” [dut] = 50% by default.
Result: the voltage source will pulsate from 14.4 V to 21.6 V with a frequency of 20
Hz, the pulses will have equal shape in amplitude and in time.
The “duty cycle” parameter is set to 50% by default; changing this value
introduces asymmetry between the voltage pulse time and the voltage “pause”
time:
by default
"duty cycle" [dut] = 50%
"duty cycle" [dut] = 20%
"duty cycle" [dut] = 70%
The machine will react in such a way that the average voltage level, during
the welding process, will be at the level of the installed welding voltage main value
- 18 V (as it was set), respectively, and the heat input to the welding seam will be at
the same 18 V, but the welding process stability, the weld pool mixing and the
penetration will change. This is a very important condition for the user to
accurately estimate the amount of change in heat input to the weld pool, for
example, comparing with another main voltage without a pulsed mode.
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