In recent years, there is increasing interests in spot welder with industrial growth of automobile. It makes autowelding and short-time welding possible. Conventional spot welders using AC source bring about the depreciation of welding products, becau...
In recent years, there is increasing interests in spot welder with industrial growth of automobile. It makes autowelding and short-time welding possible. Conventional spot welders using AC source bring about the depreciation of welding products, because constant current control makes its workpiece spattered during welding process.
In this paper, the constant power control strategy using PI controller is proposed to improve the quality of the welding products. PI controller is implemented by 16bit one-chip 80C196KB microcontroller.
In comparison with AC spot welder, the DC spot welder with high frequency PWM inverter is lighter in its size and weight than that of AC spot welder, which is more reliable and obtains high efficiency.
Simulation and experimental results show that DC spot welder with single phase PWM inverter is effectively controlled by the constant power control method in very short-time.