Operation, Welder operation, Caution – Lincoln Electric COMMANDER SVM145-B User Manual

Page 25

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Using your welder at low amperages with long idle run-
ning periods during the break-in period may result in a
glaze forming on the engine cylinder walls and the
rings not seating properly. No amount of loading will
properly seat the piston rings after they are glazed
over.

TYPICAL FUEL CONSUMPTION

Refer to Table B.2 for typical fuel consumption of the
Commander 300 engine for various operating scenar-
ios.

Table B.2 Deutz F3L 912 Engine Fuel Consumption

WELDER OPERATION

STICK WELDING

The Commander 300 can be used with a broad range
of DC stick electrodes.

The SELECTOR switch provides five overlapping
slope controlled current ranges. The CONTROL
adjusts the current from minimum to maximum within
each range. Voltage is also controlled by the CON-
TROL in the slope controlled setting. These slope-con-
trolled settings are intended for “out-of-position” weld-
ing, including pipe welding, where the operator would
like to control the current level by changing the arc
length.

PIPE WELDING

The Commander 300 is equipped with special circuitry
to minimize pop-outs in the five slope modes at any
open circuit voltage.

For a soft arc characteristic, set the “SELECTOR”
Switch to the lowest setting that still provides the cur-
rent you need and set the “CONTROL” near maximum.
For example: to obtain 140 amps and a soft arc, set the
“SELECTOR” Switch to the “150 MAX” position and
then adjust the “CONTROL” for 140 amps.

When a forceful “digging” arc is required, use a higher
setting and lower the open circuit voltage. For example:
to obtain 140 amps and a forceful arc, set the “SELEC-
TOR” to the “230 MAX” position and then adjust the
“CONTROL” to get 140 amps.

CONSTANT CURRENT (CC) WELDING

The most clockwise position of the “SELECTOR”
switch is designed for horizontal welds with all types of
electrodes, but especially low hydrogen. The “CON-
TROL” 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 preventing
sticking. This is another way of increasing arc force.

TIG WELDING

The Commander 300 can be used in a wide variety of
DC Tungsten Inert Gas (TIG) welding applications.
When used with the K930-1 or -2 TIG module or K799
Hi-Freq Unit, ratings are limited to 375 amps at 20%
duty cycle, 300 amps at 60% duty cycle, and 250 amps
at 80% duty cycle.

OPERATION

B-9

COMMANDER 300