Double-laser-beam composite welding method

Abstract

The invention discloses a double-laser-beam composite welding method. Two lasers are adopted to output two laser beams; the two laser beams are transmitted by two independent optical fibers, and are focused to synchronously weld workpieces; the two laser beams are divided into a welding light beam and a scanning light beam according to the effects; the scanning light beam is transmitted to the surface of a welding line through a galvanometer for reciprocating scanning with an acting point of the welding light beam on the surface of the welding line as center; the two laser beams form common molten pool welding on the surface of the welding line; and in the welding process, the scanning light beam performs high-speed reciprocating scanning on two sides of the welding line according to a set scanning path, a molten pool is stirred in the scanning process, and meanwhile, the connection between two sides of the welding line can be improved. Through reciprocating scanning and stirring of the laser beams, the flowing of the molten pool can be reinforced to easily exhaust gas, and gas holes are eliminated, so that such problems as non-melting and gas holes generated in single-laser-beam welding can be eliminated, and the welding quality is greatly improved.

Description

technical field [0001] The invention relates to a laser processing method, in particular to a double laser beam composite welding method. Background technique [0002] Laser welding is an advanced welding method, which has the advantages of large single-pass welding penetration, fast welding speed, and small welding deformation. Therefore, the welding quality is higher than that of traditional welding methods, and it has been widely used in industrial production. However, there are also some defects in laser welding, such as the small spot after the laser beam is focused, and the molten pool formed during the welding process is small, which requires the gap between the welding base materials to be small enough. Generally speaking, welding The gap between the base metals should not be greater than 1 / 2 of the diameter of the focused spot, which puts high requirements on the assembly conditions of the weldment (gap, wrong edge, unequal thickness, etc.), and increases the produc...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a laser welding method that can fully reflect the heat of laser welding in view of the high requirements of laser welding on the assembly conditions of weldments (gap, misalignment, unequal thickness, etc.), and the problems of focus fluctuation and beam alignment that are difficult to control. The dual laser beam composite welding method has the characteristics of small influence area, small welding deformation, etc., and can meet the conventional joint gap assembly conditions

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