What are the difference between ordinary non-inverter AC welding machine and our inverter controlled ones?

Ordinary mains frequency welding control system (ordinary non-inverter AC welding machine):

1. Input power: single phase, 380 V/50-60 HZ
2. Control technology: 20ms per cycle (10ms is also available)
3. Output control: the phase shift trigger, chopping wave 50-60HZ
4. Core device: bidirectional thyristor

Advantages:

1. Simple system
2. Simple structure
3. Easy assembly

Disadvantages:

1. It affects the electricity grid largely and decrease the single phase voltage sharply. It would affect the running of CNC machines under this grid.
2. The welding transformer has a low efficiency with load rate 50% and lose a lot of power, because its power output is triggered by the phase shift and controlled by chopping wave
3. When the welding transformer works, the input current reaches 200-400 A or more and impact the grid largely.

Medium frequency inverter control system (Inverter controlled welding machines):

1. Input power: 3 phases AC 380v/50-60 HZ
2. Control technology: 1ms/cycle, AC-DC-PWMAC
3. Output control: PWM pulse 500 V, 0-400 HZ
4. Core device: IGBT

Advantages:

1. The single phase voltage wouldn’t decrease sharply because the three phase is symmetrical
2. It increases the efficiency of welding transformer largely with load rate 97%.
3. With the same power, if controlled by inverter, the single phase current input can reduce by around 50%.
4. It controls the welding precisely with the key imported key device.
5. It is easy to operate by touch screen
6. It makes sure the system run steadily by self-checking.