LASER WELDING METHOD Russian patent published in 2015 - IPC B23K26/20 B23K26/67 

FIELD: physics.

SUBSTANCE: laser welding is carried out by emitting two laser beams along a fusion line on the side of the upper surface of the processed component. The two laser beams are transmitted through different optical fibres with diameter of focused spots of 0.3 mm or more. The leading laser beam and rear laser beam of the two laser beams is inclined in the welding direction at an angle of incidence relative to the direction perpendicular to the upper surface of the processed component. The leading laser beam is ahead of the rear laser beam on the upper surface of the processed component in the welding direction. The rear laser beam is behind the leading laser beam. The angle of incidence of the leading laser beam is set greater than that of the rear laser beam.

EFFECT: preventing sputtering and sticking to the upper surface of the processed component and the optical component during welding, preventing undercut or underfill of the joint on the back surface of the processed component.

3 cl, 4 dwg, 3 tbl, 2 ex