Welding parameters optimization of CO₂ laser-MAG hybrid welding

In the present work, Hanover Analysator, analysis system and high speed camera were used to acquire the voltage and current data of CO₂ laser-MAG hybrid welding. The effect of the arc current, arc voltage and laser power on the oscillogram of arc voltage and welding current, the probability density distribution of arc voltages and current, the droplet transfer character, process stability and weld geometry were investigated. The results indicated that many weld arc physics parameters and droplets transfer information can be provided by Hanover Analysator and high speed camera system, which provided experimental way for optimization welding parameters. Probability density distribution of arc voltages and currents is toward center, that means the range of high current and voltage is smaller, which favors the stability of the droplet transfer and hybrid welding processes. Droplet transfer frequency was affected by laser power. The droplet diameter and growing period increases with increasing laser power. As a result, the droplet transfer mode is globular transfer or transfer mode between globular and projected.