Features of hybrid laser-arc welding of GTD-111 superalloy compared to laser beam welding

In order to influence the electric arc as a heat source on the welding pool created by the laser, hybrid laser-arc welding (HLAW) and laser beam welding (LBW) methods were utilized for the welding of GTD-111 superalloy. The results showed that the HLAW method, due to the creation of more heat input, provides the conditions for the exit of gaseous pores created in the weld metal. The electric arc, located 5 mm from the laser beam, re-melted the solidified grains in the keyhole and provided the conditions for nonhomogeneous nucleation of the equiaxed grains.

Automated summary

The study found that the hybrid laser-arc welding method provides more heat input compared to laser beam welding, which helps expel pores and provides conditions for nonhomogeneous nucleation.