Galvanized steel sheet double-beam laser splicing and welding method and system

Abstract

The invention discloses a galvanized steel sheet double-beam laser splicing and welding method which includes the steps: 1 providing a first workpiece and a second workpiece which are galvanized steelsheet needed to be spliced and welded; 2 vertically perpendicularly splicing and clamping the first workpiece and the second workpiece; 3 providing a laser welding system; 4 starting the laser welding system, and obliquely irradiating the surface of the first workpiece by the double-laser beams focused and formed by the first laser head and the second laser head to finish a welding process. The laser welding system comprises a first laser head and a second laser head, and laser beams focused and transmitted by the first laser head and the second laser head are parallelly and symmetrically distributed along the welding direction. The invention further discloses a galvanized steel sheet double-beam laser splicing and welding system. Compared with the prior art, the method has good welding effects and is simple in process, easy to control and low in cost.

Description

technical field [0001] The invention relates to the field of laser welding, in particular to a method and system for lap welding of 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 lower than the meltin...

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Problems solved by technology

However, this method is difficult to maintain a consistent gap in actual operation, which increases the difficulty of matching and selecting laser welding process parameters

[0006] Published on August 19, 2009, the invention patent with the announcement number CN 101508058 A "A method for laser welding of lap joints of galvanized steel sheets" discloses a method for laser welding of lap joints of galvanized steel sheets. -45WT% AL-SN alloy foil is placed between the overlapping surfaces of steel plates, and then two laser beams with powers of 2-3KW and 3-4KW are used to weld the weld seam, which solves the problem of low efficiency and spatter in welding production , poor corrosion resistance of welds, etc.

However, in this method, the pre-set metal foil increases the complexity of the process and the processing cost is high.

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