Analysis of arc stability of self-shielded flux-cored wire laser-arc hybrid

The influence of arc stability on different process parameters during Laser-arc hybrid welding which used self-shielded flux-cored wire (414N-O) with the help of Hannover Analysator and high speed photography were studied. The results indicated that the probability of arc point drift and short circuiting transfer of self-shielded flux-cored wire are reduced with the addition of laser. Oppositely, arc length is elongated and the arc stability is improved. In the parameters, the distance between laser and arc(D_LA) and wire feed speed have appreciable impact on the mean actual output current, and the stability of current coefficient of variation.is significantly affected by welding voltage and wire feed speed. The influence range of laser power to mean actual output current is related to D_LA and wire feed rate, and the influence declines with D_LA and wire feed rate increase. The influence range of welding voltage to mean actual output current is related to D_LA and it has the greatest impact when D_LA is 0 mm. Laser leading is more beneficial than laser trailing to the stability of current coefficient of variation.