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PATON
®
ADI 200 STANDARD TIG/MMA MIG/MAG
4.9 POST WELDING GAS PURGING
According to this function, the weld area is purged with protective gas after welding in order to
prevent contact of molten metal in the weld area with atmospheric air. By default, the gas purging
period
[Post Flow]
is 2.5 s and can be varied by the operator at his option.
4.10 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.
To activate this function, it is necessary to set the following three operational parameters of the
welding process: current pulse amplitude
[POWER OF PULSE]
,
current pulse frequency
[FREQUENCY OF PULSE]
,
and duty cycle
[DUTY CYCLE OF PULSE]
.
By default, the current pulse
amplitude is 0 [OFF], that is, the function is switched off, the current pulse frequency is 5 Hz, and
the duty cycle is 50 %. To activate the function, set the current pulse amplitude higher than 0. The
current pulse amplitude should be set in percentage of the welding current specified for the welding
process.
Example:
Welding is to be performed with welding no consumable tungsten electrode 2.0 mm
in diameter. The set welding current is 100 A. The current
[POWER OF PULSE]
pulse amplitude is 30 %. The current pulse frequency is 5 Hz
[FREQUENCY OF
PULSE]
(default value). The duty cycle is
[DUTY CYCLE OF PULSE]
50 % (default
value).
Result:
The result is the following: the welding current pulse amplitude will be in the range
of 70 … 130 A, the current pulse frequency will be 5 Hz, and the current pulse
length will be equal to the length of an interval between pulses. If the duty cycle is
not equal to 50 %, the current pulses will be nonsymmetrical relative to the
intervals between pulses, but the average welding current value will be equal to the
set welding current value of 100 A. As a result, the average heat input to the weld
will not change.
