Laser/high-frequency induction hybrid welding

Laser welding is widely used in practice,but it also has some disadvantages,such as porosity,low absorptivity for laser,and crack when high-carbon or high-alloy steels are welded.To overcome these shortcomings,a laser/high-frequency induction hybrid welding technology was presented,and 30CrMnSiA was welded by this method.Compared with laser welding,the martensite composition in the weld structure is less,the bainite composition is more,and the inclination of crack is less.The weld penetration and width are obviously increased by the hybrid welding.At the same time,the aided heat source of high-frequency induction neither enlarges the width of HAZ,nor worsens HAZ metallurgical structure.The experiment results have proved that the laser/high-frequency induction hybrid welding has the following advantages than laser welding: more excellent organization and performance of weld joint,lower inclining to bring porosity or crack,and higher welding efficiency.