Welding Capability; Limitations - Lincoln Electric SQUARE WAVE TIG 255 SVM100-A Service Manual

B-5
• 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 of input wires (no lugs
required).
• Low fan noise at idle.
• Modular construction for easy servicing.
• Simple keypad layout allows even novice users to
operate with minimal instruction.
• Unused controls are automatically locked out to
simplify 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.

WELDING CAPABILITY

The Square Wave TIG 255 is rated at 255 amps, 30
volts, at 40% duty cycle on a ten minute basis. It is
capable of higher duty cycles at lower output currents.
If the duty cycle(s) are exceeded, a thermal protector
will shut off the output until the machine cools to a
reasonable operating temperature.

LIMITATIONS

The Square Wave TIG 255 is not recommended for
arc gouging due to its limited output capacity.
The Square Wave TIG 255 is not recommended for
AC TIG welding when high concentrations of helium
are used for shielding; starting problems and arc recti-
fication may occur.
The Square Wave TIG 255 is not recommended for
pipe thawing.
SQUARE WAVE TIG 255
OPERATION