METHOD OF LASER ARC ORBITAL WELDING Russian patent published in 2015 - IPC B23K31/02 B23K26/282 B23K26/348 

FIELD: metallurgy.

SUBSTANCE: method means simultaneous action on the external surface of the welded pipe samples of the laser beam and arc in shielded gases. Arc is generated by consumable electrode with creation if the common welding pool. Preliminary depth of embedding of the laser beam focal plane relatively to the external surface of the welded samples is set equal to (5±0.5 mm), and distance between axes of the laser beam and electrode is set equal to (3±0.5 mm). Fusion penetration is performed with beam power ≥10 kW. Inclination angle of the welding torch relatively to the laser beam is adjusted within range from 30° to 60° with change speed of the inclination angle of the welding torch relatively to the laser beam determined depending on welding speed and radius of the welded pipe samples. As the shielding medium the gas mixture containing active and inert gases is used.

EFFECT: quality improvement of the welded joint, welding efficiency and possibility of pipe samples welding with higher thickness.