Welding Capability; Limitations - Lincoln Electric SQUARE WAVE TIG 355 Service Manual

B-4
• 115 Volt receptacle with 15 amp circuit breaker.
• 220 Volt European (Schuko) type receptacle with 2
amp circuit breaker for water coolers (50/60Hz
machines only).
• Excellent arc starting and stability up through 400
amps.
• High resistance to AC arc rectification.
• No tungsten spitting within current range of elec-
trode.
• Compact size, requires only a 22.25 in x 26 in (565
mm 660 mm) footprint.
• Strain relief holes in base for welding cables, gas
and water hoses and control cables.
• Easy access for input connections. Connections are
simple strip and clamp off input wires (no lugs
required).
• Low fan noise at idle.
• Modular construction for easy servicing.
• Unused controls are automatically locked out to sim-
plify setup. Examples: the AC Wave Balance control
has no effect in DC; the High Frequency and gas and
water valves do not operate in Stick mode; TIG
Pulser is locked out in the Stick mode.
• Recessed panels protect controls, output terminals,
gas and water fittings.
• Large safety margins and protective circuits protect
rectifiers from transient voltages and high currents.
• Line voltage compensated.
• Thermostatically protected.
• Electronic over current protection.
OPERATION

WELDING CAPABILITY

The Square Wave TIG 355 is NEMA Class II (40)
Power Source rated 350 amps at 34 volts, 40% duty
cycle. The duty cycle is based upon a 10 minute time
period. (For 40% duty cycle, it is 4 minutes on and 6
minutes off.) The overload capacity is 375 amps at 35
volts, 30% duty cycle.
The "Lincoln Plus" rating of 300 amps at 40 volts pro-
vides additional voltage to overcome voltage drops in
long cables when stick welding at high currents.

LIMITATIONS

• The Square Wave TIG 355 is not recommended for
arc gouging. The machine's output capacity is too
limited.
• The Square Wave TIG 355 is not recommended for
AC TIG welding with high concentrations of helium
shielding gas. Starting problems and arc rectification
may occur.
• The Square Wave TIG 355 is not recommended for
pipe thawing.
SQUARE WAVE TIG 355
B-4