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PATON
®
ADI 200 STANDARD TIG/MMA MIG/MAG
5.4 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
[POWER OF PULSE]
,
voltage pulse frequency
[FREQUENCY OF PULSE]
,
and duty cycle
[DUTY CYCLE OF PULSE]
.
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
[POWER OF PULSE]
higher than 0. The voltage pulse amplitude should be set in percentage of the welding voltage
specified for the welding process.
DEFAULT VALUE
"duty cycle"
[dut] = 50%
"duty cycle"
[dut] = 20%
"duty cycle"
[dut] = 70%
Example:
Welding is to be performed with electrode wire 0.8 mm in diameter.
The set wire
feed velocity is 5.5 m/min.
The set welding voltage is 18 V.
The voltage pulse
amplitude
[POWER OF PULSE]
is 20 %.
The voltage pulse frequency
[FREQUENCY
OF PULSE]
is 20 Hz (default value).
The duty cycle
[
DUTY CYCLE OF PULSE]
is
50 % (default value).
Result:
The result is the following
: the welding voltage pulse amplitude will be in the
range of 14.4 … 21.6 V, the voltage pulse frequency will be 20 Hz, and the voltage
pulse length will be equal to the length of an interval between pulses. If the duty
cycle is not equal to 50 %, the voltage pulses will be nonsymmetrical relative to the
intervals between pulses, but the average welding voltage value will be equal to the
set welding voltage value of 18 V. As a result, the average heat input to the weld
will not change.
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t, s
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