Lincoln Electric IM931 manual Welder Operation, Stopping, Duty Cycle, Lbs./Hr Kg/hr

B-4 OPERATION B-4

CAUTION

Operating the starter motor for more than 5 sec- onds can damage the motor. If the engine fails to start, release the switch and wait 10 seconds before operation the starter again. Do NOT push the START button while the engine is running because this can damage the ring gear and/or the starter motor.

STOPPING

Remove all welding and auxiliary power loads and allow the engine to run at low idle speed for a few minutes to cool the engine.

Stop the engine by placing the RUN-STOP in the STOP position.

Note: The engine will run for a breif moment (3 to 5 seconds) while the excess fuel is burned out of the system.

WELDER OPERATION

DUTY CYCLE

Duty Cycle is the percentage of time the load is being applied in a 10 minute period. For example, a 60% duty cycle represents 6 minutes of load and 4 minutes of no load in a 10 minute period.

DC Stick Welding

The RANGER 250 LPG can be used with a broad range of DC stick electrodes.

The MODE switch provides two stick welding settings as follows:

Constant Current (CC-STICK) Welding

The CC-STICK position of the MODE switch is designed for horizontal and vertical-up welding with all types of electrodes, especially low hydrogen. The out- put CONTROL dial adjusts the full output range for stick welding.

The ARC CONTROL dial sets the short circuit current (arc-force) during stick welding to adjust for a soft or crisp arc. Increasing the number from -10(soft) to +10(crisp) increases the short circuit current and pre- vents sticking of the electrode to the plate while weld- ing. This can also increase spatter. It is recommended that the ARC CONTROL be set to the minimum num- ber without electrode sticking. Start with the dial set at 0.

DOWNHILL PIPE Welding

This slope controlled setting is intended for "out-of- position" and "down hill" pipe welding where the oper- ator would like to control the current level by changing the arc length. The output CONTROL dial adjusts the full output range for pipe welding. The ARC CON- TROL dial sets the short circuit current (arc-force) dur- ing stick welding to adjust for a soft or more forceful digging arc (crisp). Increasing the number from -10(soft) to +10(crisp) increases the short circuit cur- rent which results in a more forceful digging arc. Typically a forceful digging arc is preferred for root and hot passes. A softer arc is preferred for fill and cap passes where weld puddle control and deposition (“stacking” of iron) are key to fast travel speeds. This can also increase spatter. It is recommended that the ARC CONTROL be set to the minimum number with- out electrode sticking. Start with the dial set at 0.

TYPICAL RANGER 250 LPG FUEL CONSUMPTION

	Kohler CH20 S
	20HP @ 3600 RPM
	Lbs./Hr (Kg/hr)
Low Idle - No Load
2400 R.P.M.	3.42 (1.55)
High Idle - No Load
3700 R.P.M.	4.46 (2.02)
DC Weld Output
250 Amps @ 28 Volts	7.22 (3.27)
Auxiliary Power
8,000 Watts	7.23 (3.28)

RANGER 250 LPG