Self-fuse laser deep penetration welding method

Abstract

The invention relates to a self-fuse laser deep penetration welding method. The self-fuse laser deep penetration welding method comprises the following steps that laser filler wire welding is performed by using two beams of laser, a welding workpiece is melted by using the first laser beam to form a keyhole so as to form a molten pool, the second laser beam is located on the edge position of the molten pool formed by the first laser beam, a solid welding wire is melted by using the second laser beam, and after the solid welding wire is melted, the solid welding wire continuously flows into themolten pool along the edge of the molten pool under the surface tension effect to finally finish welding. Due to the fact that the second laser beam is located at the edge position of the molten poolformed by the first laser beam, liquid metal formed by melting the welding wire through the second laser beam can continuously flow into the molten pool under the attraction effect of the surface tension of the molten pool, and the impact on the keyhole and the molten pool by continuous flowing into the molten pool along the edge of the molten pool is minimum, the stability of the welding processcan be obviously improved, the number of process air holes is obviously reduced, and then the welding seam quality is improved.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a self-fusing laser deep penetration welding method. Background technique [0002] Compared with conventional welding methods, laser welding technology has the characteristics of fast welding speed and small deformation of welding workpieces. Laser wire welding technology is widely used in aviation, aerospace, automobile, shipbuilding and other industrial fields. However, in traditional laser wire filler welding, the energy of the laser beam has two functions, one function is to form a keyhole as a heat source and then form a molten pool, and the other function is to melt the solid welding wire. The traditional laser wire filler welding solid welding wire needs to be fed to the edge of the keyhole and then melted by laser energy and thermal radiation of the molten pool, but this will directly cause the liquid metal to impact the keyhole when it enters the molten pool, resu...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a self-fusing laser deep penetration welding method to solve the problem of the low-speed and high-speed welding process of laser wire filler welding in the prior art. The heat input of energy to the base metal is too large, the welding workpiece is deformed, and the mechanical properties are deteriorated.

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