18 | P a g e
PATON
®
PSI STANDARD SERIES DC MIG/MAG TIG/MMA
4.4. LINEAR INCREASE OF WELDING CURRENT
This function provides the economic consumption of an electrode, promotes the extension of the service
life of the welding torch, and facilitates the use of the welding torch. This function prevents the spillage
of molten metal in the welding pool. Additionally, during the period
[TIME UP ARC]
of linear increase of
the welding current, it is possible to accurately locate the welding torch in the weld area, as the arc
starting point is initially not always is located in the weld area. It is reasonable to heat the weld area. By
default, the period of linear increase of welding current is
1.0 s
The procedure for changing the values of the operational parameters of the welding unit is described in Section
6.1.
4.5. 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
[POWER OF PULSE]
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 pulse amplitude is 30 %. The
current pulse frequency is 5 Hz (default value). The duty cycle is 50 % (default value).
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.
Default value
"duty cycle"
= 50%
"duty cycle"
= 20%
"duty cycle"
= 70%
t, s
t, s
t, s
Summary of Contents for PSI 160 Standard
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