Lincoln Electric 275 manual Stick Welding, Pipe Welding, TIG Welding

B-7 OPERATION B-7

When the triggering device is pressed the contactor is closed and the welding terminals are “Hot.”

When the triggering device is released the contactor is opened and the welding terminals are “Cold.”

“MODE” Switch - Set to the desired process: STICK/TIG, PIPE, or WIRE FEED.

“WIRE FEEDER VOLTMETER” Switch - If using a wire feeder that has a voltmeter, set this switch to match the polarity of the electrode.

STICK WELDING

The Ranger 275 can be used with a broad range of DC stick electrodes. The output “CONTROL” adjusts the full range of 20 to 300 amps. Set the “ARC CON- TROL” to low setting to minimize spatter. If sticking is a problem, turn this control to a higher setting (clock- wise). This will increase the short circuit current (arc force).

PIPE WELDING

The “PIPE WELDING” mode is recommended for manual vertical-down techniques on pipe joints using EXX10 type electrodes. This slope controlled setting allows the operator to control the welding current by changing the arc length.

The “ARC CONTROL” (arc force) is automatically switched off in this mode.

TIG WELDING

The Ranger 275 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, ratings are limited to 275A at a 60% duty cycle and 250A at a 80% duty cycle.

Ranger 275 settings when using the K930-1 or -2 Tig Module:

a.Set the “MODE” Switch to the STICK/TIG setting.

b.Set the “IDLER” Switch to the “AUTO” position.

c.Set the “LOCAL/REMOTE” switch to the “REMOTE” position.

d.Set the ”WELDING TERMINALS” switch to the

“WELDING TERMINALS REMOTELY CON- TROLLED” position. This will keep the “Solid State” contactor open and provide a “cold” elec- trode until the triggering device (Amptrol or Arc Start Switch) is pressed.

e.Set the “ARC CONTROL” to minimum.

See Table B.2 for Typical Current Ranges for Tungsten Electrodes.

RANGER 275