AC Welding Systems are generally composed of the three elements. The Welding Transformer, the Welding Control, and the Mechanical System.
WELDING TRANSFORMERS – are used in AC machines to change alternating current from the power line into a low-voltage, high amperage current in the secondary winding. A combination of primary and/or secondary taps on the welding transformer are commonly used to provide a macro adjustment of the welding current, as well as adjustment of secondary voltage. Transformer ratings for AC machines are expressed in KVA (kilovoltamperes) for a specified duty cycle. This duty cycle rating is a thermal rating, and indicates the amount of energy that the transformer can deliver for a stated percentage of a specific time period, usually one minute, without exceeding its temperature rating. The RMS Short Circuit Secondary Current specification indicates the maximum current that can be obtained from the transformer. Since heating is a function of the welding current, this parameter gives an indication of the thickness of the materials that can be welded. Recent advances in AC welding technology have adapted constant current feedback control at the line frequency (50 or 60 Hz) which can be useful for welds longer than 5 cycles (82-100 milliseconds) by automatically adjusting the power supply parameters.
- Three control functions: constant primary and secondary current, constant voltage;
- Automatic adjustment of welding power and welding current;
- Ensure the automatic cycle of each program segment of welding process in order to achieve complete automation;
- When the current is too low, it will automatically electrify to conduct repair welding;
- Be able to use the control panel to set parameters for different welding models directly. Convenient operation, easy adjustment;
- Both single welding and continuous welding are available and each welding cycle has three welding conditions;
- The intensity and time of welding current of each welding condition could be set separately. In the meantime, the current could be set to gradual up or down;
- Pneumatic control (action output); the pneumatic control could be delayed;
- Be able to store 32 types of welding models. Be able to select and adjust different welding models by choosing the number of models;
- When the power grid voltage fluctuates, the automatically compensation can make the welding current more stable. Thus, the welding quality could be guaranteed even though the grid voltage is under bad situation.
Constant Current Control:
The current control is within the range of preset current because of the change of relevant voltage and load of power source.
Constant Voltage Control:
The voltage is within the range of preset value because of the change of the voltage of power source.
Slow Rise Current:
according to the presetting time, the gradual rise of current helps to prevent the splash due to the lack of pressure and to prevent the primary splash when it starting to weld.
After starting the switch (pedal switch), the sequence start from the pressurizing time.
Fault Code Display:
Alarming function will be at work when the following situations occur: default phase of power grid, half wave of silicon controlled, too high water temperature, break of synchronous signal, error of the storage data, etc.
Single Phase AC or 3 Phase AC is the most fundamental type of output solution. Current returns to zero every half cycle (100 times persecond at 50hz AC-net). This type of current solution creates a “no current flow” period and induces intermittent heating phenomenon. AC welding machines with Constant Current Controllers possess the functions of primary voltage compensation and primary/secondary constant current feedback control which automatically adjust power fluctuations.
The AC welder derives its name from the fact that its output is generally a sine wave of the same frequency as the power line. It extracts energy from the power line as the weld is being made. For this reason, the power line must be well regulated and capable of providing the necessary energy. Our AC welders include a line voltage compensation feature to automatically adjust for power line fluctuations. In its simplest form, the AC welder consists of a welding transformer that steps down the line voltage (normally between 480 to 100 volts) to the welding voltage (typically 2 to 20 volts). The welding current that flows through the secondary of the transformer, and its connected load, is very high, ranging from 10 to more than 100,000 amps. The welding current is allowed to flow for very short periods of time, typically .001 to 2 seconds. AC welders can operate at rates up to 5-6 welds per second.