OPERATION |
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ADVANCED TIG WELDING FEATURES
AC WAVE BALANCE AND AUTO BALANCE™
AC Wave Balance is a feature unique to square wave TIG power sources. It is active only in AC TIG mode. It controls the amount of positive and negative current in the AC output.
The Square Wave TIG 255 allows the operator to select Auto Balance™. This selection provides automatic adjustment of the AC Wave Balance; it is suitable for most welding conditions. Auto Balance gives the ideal amount of cleaning and penetration, based on the welding current output.
Manual adjustment of the AC Wave Balance is also possible. Select the Manual Balance key, and the Balance setting will appear in the Momentary Display. Manual Balance settings vary from +5 (maximum cleaning) to
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.
Up/Down. Adjustment of the pulses per second (pulse frequency), allows for control of the heat input into the work piece. This adjustment can reduce distortion and burnthrough on thin guage base metal. 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 cur- rent) is fixed at 50%.
AUXILIARY POWER
ALL MACHINES
The Square Wave TIG 255 provides 10 amps of 115 volt AC power at a standard NEMA
CAUTION
Note that some types of equipment, especially pumps and large motors, have starting currents which are sig- nificantly higher than their running current. 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.
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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
50/60Hz MACHINES
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, locat- ed 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 aux- iliary circuit is intended for running water coolers whose current draw is within the 2 amp rating of the receptacle.