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PATON
®
PSI STANDARD SERIES DC MIG/MAG TIG/MMA
5.8. 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 voltage 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
[FREQUENCY OF PULSE]
is 20 Hz, and the duty
cycle
[DUTY CYCLE OF PULSE]
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.
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).
The result is
: The following: the welding pulse voltage amplitude will be in the range of 14.4 … 21.6 V.
the welding voltage pulse frequency will be 20 Hz, and the pulse length will be equal to the
length of an interval between pulses. If the duty cycle is not equal to 50 %, the pulses will
be nonsymmetrical relative to the intervals between pulses, but the average welding value
will be equal to the set welding voltage of 18 V. As a result, the average heat input to the
weld will not change.
Default Value
"duty cycle" = 50%
"duty cycle"
= 20%
"duty cycle"
= 70%
If it is required to reduce heat input to the weld, as in welding thin parts, the welding voltage should be
decreased by performing the standard setting operations. In this case, voltage pulse parameters will be
adjusted automatically according to the set welding voltage, and the operator can control the reduction of
the heat input as compared with the preceding mode by simultaneously varying the voltage pulse
amplitude and duty cycle.
The aforementioned parameters should be set differently for different welding processes, depending on
the requirements of the operator.
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Summary of Contents for PSI 160 Standard
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