Study on collection and analysis system of energy quality signals of welding power source

Welding power source is a commutate power source to the main,which results in serious harmonic pollution,and breaches the result of pure sine wave,decrease power factor,as well as wastes much energy and interferes the electro-equipments.This paper collects and analyzes the harmonic signals of the CO2 welding machines main transformer,by which researches the effect of welding power source on the main.