Kind of Welding Power Supply and Current Waveform

Ac welding power supply
The most popular one. Simple construction makes it easy-to-handle, durable and inexpensive; however, thermal efficiency is not so good that it affects the power supply thermally. Not suited for ultra-precise welding but suited for iron-group metal welding.

Capacitor welding power supply
Charges a capacitor once, then discharges, to flow a large current at a time.
Owing to the large current, it can weld high-thermal-conductivity material such as aluminum, copper. As it charges capacitor, input capacity of power supply can be reduced; nevertheless, a stable welding is performed. However, current rises steeply and gradient angle of the rising current cannot be controlled, causing a spatter easily. Electrode force must be increased to reduce the spatter. Precaution against Peltier effect which is due to direct current is needed.

Transistor welding power supply
Performs ultra-precise welding because transistor can adjust the welding current precisely to reduce spatter. As the current control speed is high, the power supply is used to weld a very fine wire such as bulb filament. High -resistance material such as molybdenum, tungsten are the best choice.

Dc inverter welding power supply
Unlike ac, dc can supply heat efficiently and continuously without its being zero. Owing to this, thermal efficiency is so high that welding is done in a short period of time; therefore, thermal influence is reduced and power consumption is lowered. In addition, inverter high-speed feedback control reduces spatter, ensuring stable weld quality, and making ultra-precise welding possible. What is more, this power supply is suitable for mounting on automated machine because its transformer can be downsized.

Ac inverter welding power supply
Features the advantage of an inverter power supply, i.e., it welds with improved thermal efficiency and maintains stable weld quality; additionally, this power supply solves Peltier effect (polarity effect) because it is ac-operated, and what is still better, it accepts a welding transformer for ac. It is best suited for fusing.