Zero-gap galvanized steel sheet spliced joint laser welding method and system

Abstract

The invention relates to a zero-gap galvanized steel sheet spliced joint laser welding method which is characterized by including the steps: firstly, providing a first workpiece and a second workpiecewhich need to be welded in a spliced manner; secondly, vertically splicing and clamping the first workpiece and the second workpiece; thirdly, providing a laser self-fusion welding system; fourthly,providing a laser filler wire welding system; fifthly, starting the laser self-fusion welding system; sixthly, starting the laser filler wire welding system, performing filler wire welding by a secondlaser welding head and a wire feeding head along a track of a first laser welding head to finish a welding process. The second laser welding head, the wire feeding head and the first laser welding head are serially arranged to form a column in a welding direction, the first laser welding head focalizes to form high-energy laser beams, and the laser beams vertically irradiate the surface of the first workpiece. The invention further discloses a zero-gap galvanized steel sheet spliced joint laser welding system. Compared with the prior art, the method has good welding effect and is simple in process.

Description

technical field [0001] The invention relates to the field of laser welding, in particular to a laser welding method and system for lap joints of zero-gap galvanized steel sheets. Background technique [0002] The many excellent properties of galvanized steel, especially its excellent anti-corrosion performance and economic benefits, make it occupy a very important position in modern industrial production. Various types of galvanized sheets are used in a wide range of fields such as automobile construction, construction, ventilation and heating installations, and furniture manufacturing. [0003] However, due to the existence of the zinc layer in galvanized steel, the welding processability of galvanized steel is greatly reduced. The reason is that during the welding process of galvanized steel, the physical properties of the zinc coating and the base steel are greatly different (the melting point of the zinc coating layer is 420 °C, the boiling point is 907 °C, which is far...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the zinc layer evaporates violently during the laser welding process of the lapped joints of zero-gap galvanized steel sheets, the welding process is extremely unstable, and defects such as splashes and pores on the welding surface are prone to occur.

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