OPERATION
BALANCED (0): The amounts of positive and negative are the same.
CLEANING (+1 to +5): Provides more positive current than negative. Since the positive current produces the “cleaning” or oxide removal on aluminum, this setting is used for welding on heavily oxidized aluminum.
PENETRATION
CAUTION: Use only the amount of cleaning required because the greater amount of positive current will heat the tungsten more and possibly cause it to melt or “spit”. Also, the arc is usually more flared and less stable with more cleaning current.
In general, use just enough “cleaning” to remove oxides and to give good wetting to the puddle.
TIG Pulser
The Square Wave TIG 255 contains a unique TIG Pulser circuit. The TIG Pulser has On/Off selections, as well as adjustments for Pulses Per Second Up/Down. When the Pulser is turned On, or when the Pulses Per Second are adjusted, the pulse frequency is shown in the Momentary Display. It can be varied from 0.5 Hz to 10 Hz in 0.5 Hz increments. (One Hertz {Hz} is equivalent to one pulse per second.) The background current (the welding current at the low point of the pulse cycle) is automatically adjusted from 40% to 60% of the peak current by the Square Wave TIG 255. The duty cycle (the ratio between that time spent at the peak current vs, the time spent at the background current) is fixed at 50%.
STICK WELDING
1.Remove the amptrol or Arc Start Switch from the Remote Receptacle.
2.Turn the welder on. The Control Panel Display and red LEDS will illuminate when the power is on.
3.Select Stick Mode and Local Current Control. Set the output current using the Amps Up/Down keys. The output current setting will be displayed on the Ammeter. No other functions or adjustments operate in the Stick Mode.
4.Select DC+, AC or DC- electrode polarity.
5.Clamp the electrode in the electrode holder, start the weld by lightly touching the electrode to the work. Stop the weld by pulling the electrode away from the work piece. Note, in Stick Mode the output studs remain electrically “HOT”.
AUXILIARY POWER
ALL MACHINES
The Square Wave TIG 255 provides 10 amps of 115 volt AC power at a standard NEMA
50/60Hz MACHINES - (Codes 10024 thru 10026 & 10134)
Square Wave TIG 255 machines rated for 50/60Hz operation provide 2 amps of 220 volt AC power at a continental European (Schuko) type receptacle, located on the lower case back of the machine. This circuit is protected from shorts and overloading by a 2 amp circuit breaker, located above the receptacle. The auxiliary circuit is intended for running water coolers whose current draw is within the 2 amp rating of the receptacle. Note that some types of equipment, especially pumps and motors, have starting currents which are significantly higher than their running currents. These higher starting currents may cause the circuit breaker to open. If this situation occurs, the user should refrain from using the Square Wave TIG 255 auxiliary for that equipment.
OVERLOAD PROTECTION
This welder has thermostatic protection from excessive duty cycles, overloads, loss of cooling, and high ambient temperatures. When the welder is subjected to an overload or loss of cooling, a thermostat will open. This condition will be indicated by the illumination of the yellow Thermostatic Protection Light on the case front (see Figure 2). Also, the Display will be blank, and all of the red Control Panel LEDS will be out. The fan will continue to run to cool the power source. No welding is possible until the machine is allowed to cool and the Thermostatic Protection Light goes out.
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