B-5
OPERATION
B-5
• DC+/AC/DC- Polarity Switch allows the welder to
change polarity without reconnecting leads.
• Provides excellent arc starting and stability through-
out the machines wide current range (5 to 315 Amps)
to handle the vast majority of TIG welding applica-
tions.
• Simple output current dial allows the user to preset
the peak current within the full output range of the
machine.
• Highly resistant to AC arc rectification.
• Thermostatically protected to prevent equipment
damage.
• No tungsten spitting within current range of electrode.
• Designed to make maintenance and servicing easy.
• 115 Volt Receptacle with 10 Amp Circuit Breaker.
Domestic and Canadian Models Only.
• 220 Volt European (Schuko) type Receptacle with 2
Amp Circuit Breaker. European Model Only.
• Low Voltage Trigger Circuit (18 VAC) for maximum
operator safety.
• Remote Receptacle for Amptrol or Arc Start Switch
connection.
• Gas Valve Inlet fitting conforms to Compressed Gas
Association (CGA) standards.
LIMITATIONS
The Square Wave TIG 275 is not recommended for AC
TIG welding when high concentrations of helium gas
are used for shielding. This causes starting and arc
rectification problems. Also the Square Wave 275 is
not recommended for arc gouging due to it's limited
output capacity. The Square Wave TIG 275 is also not
recommended for pipe thawing.
DUTY CYCLE AND TIME PERIOD
The duty cycle is based upon a 10 minute time period;
i.e., for 40% duty cycle, it is 4 minutes welding and 6
minutes idling. If the duty cycle(s) are significantly
exceeded, the thermostatic protection will shut off the
output until the machine cools to a normal operating
temperature. (Refer to Technical Specifications
page)
SQUARE WAVE TIG 275
