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B-8
OPERATION
B-8
• CONSTANT CURRENT (CC) WELDING
The CC - STICK position of “30 to 375", the "WELD
MODE" Switch is designed for horizontal welds with all
types of electrodes especially low hydrogen. The
"OUTPUT" adjusts the full range of 30 to 375 amps.
This setting provides a soft, constant current arc. If a
more forceful arc is desired, then select the proper
range from the slope controlled current ranges.
In the CC mode, sticking can be prevented by adjust-
ing the “ARC CONTROL”. Turning this control clock-
wise, increases the short circuit current, thus prevent-
ing sticking. This is another way of increasing arc
force.
TIG WELDING
The most clockwise position of the WELD MODE
switch is for TIG welding in the range of 20 amps to
250 amps, with a “Touch Start” feature. To initiate a
weld, the OUTPUT is first set to the desired current
and the tungsten is touched to the work. During the
time the tungsten is touching the work there is very lit-
tle voltage or current and, in general, no tungsten con-
tamination. Then, the tungsten is gently lifted off the
work in a rocking motion, which establishes the arc.
The Commander 300 can be used in a wide variety of
DC Tungsten Inert Gas (TIG) welding applications. In
general the “Touch Start” feature allows contamination
free starting without the use of a Hi-Freq unit. But the
K930-1 or -2 TIG module or K799 Hi-Freq unit, can be
used with the Commander 300. The settings for these
follow the tungsten current range table.
COMMANDER 300