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PATON
®
ADI 200 STANDARD TIG/MMA MIG/MAG
3.2 OPERATIONAL CYCLE OF THE MANUAL ARC WELDING PROCESS
The procedure for changing the values of the operational parameters of the welding unit is
described in Section 6.1.
3.3 INCREASED – CURRENT ARC STARTING
The advantages ensured by the increased-current arc starting function are the following:
1.
Improved arc starting even when low-quality electrodes are used
2.
Better joint penetration during arc starting period and, as a result, the lower number of
defects associated with incomplete joint penetration.
3.
Prevention of slag inclusions
Manual adjustment operations:
allow the minimum arc starting current to be set in order to
decrease power consumption at the stage of arc starting. As a result, the welding arc can be started
at the minimum power supply voltage, but in this case, the arc quality characteristics at the stage of
arc starting are deteriorated, as the welding unit functions as an arc-welding transformer.
Nevertheless, in some conditions, this method of arc starting is the only possible one. The welding
current may be increased in order to improve the conditions for arc starting (when the welding unit
is connected to a reliable power supply system), but the increased current can cause burn-out when
welding thin parts. Therefore, it is recommended to set the minimum arc starting current.
What is achieved by:
During the short time interval of arc starting, the welding current increases by 40 % of the welding
current set by default.
Example:
Electrode diameter is 3 mm.
Set welding current is 90 A.
The current at the increased-
current arc starting stage is 90 + 40% =126 A.
The additional adjustment operations
allow both the arc starting current
[
POWER HOT START
],
and the arc staring period
[
TIME HOT START
].
to be varied. Do not set the increased values of these
parameters if such increased values are not required, because the operation of the welding unit and
reliable arc starting in these conditions are possible only if the welding unit is connected to a high-
power system.
The procedure for changing the values of the operational parameters of the welding unit for the
current welding process is described in Section 6.1.
t (s)
