Laser welding method for butting two pieces of metal sheets

Abstract

The invention discloses a laser welding method for butting two pieces of metal sheets, comprising the following steps: determining the size of facula according to the metal sheets; selecting a corresponding laser welding device and determining welding height according to the size of the facula; closely arranging a first welding guide plate at the initiating end of an abutment joint of the two pieces of metal sheets and arranging a second welding guide plate at the tail end of the abutment joint; with certain welding frequency, single welding energy and certain welding movement speed, carryingout movement and laser release from the first welding position of the first welding guide plate to the second welding position of the second welding guide plate along the abutment joint. The method ofthe invention ensures the same welding strength at the initial end and other positions of the welding lines, improves welding quality and increases welding strength. The welding lines welded by the method of the invention maintain the same strength property as the parent metal after a plurality times of distortion and tearing, thus having no weak spots in terms of strength.

Description

technical field [0001] The invention relates to a welding method, in particular to a laser welding method for butt-joining two thin metal plates. Background technique [0002] For a long time, for the welding of thin plate materials with a thickness of less than 0.5 mm, the deformation during the welding process is large, the base metal loss at the starting point and the end point is serious, the welding is difficult and demanding, so it is classified as precision welding by the welding industry. The difficulty of welding is that the thickness of the material is thin (generally only a few tenths of a millimeter, and some are even less than 0.1mm), which is very susceptible to the influence of various links in the welding process, resulting in the phenomenon of plate welding penetration and thermal deformation. It is applied to precision devices, so there are strict requirements on deformation and welding strength, especially in seam welding where sealing is required, and con...

AI Technical Summary

Problems solved by technology

[0003] Although the advantages of laser welding are huge, most of the products after seam welding have the following deficiencies in the current pulse laser welding process: 1. The flatness of the weld seam after welding is not high, and the deformation and distortion of the welding place are serious

2. There are base metal burning and missing phenomena at the beginning and end of the weld

3. The strength of the weld seam is low, and it is easy to be torn and impacted by external forces to break from the weld seam

4. There is welding leakage during welding

5. The width of the weld seam on the back of the initial section is from small to large, and the consistency of the back of the whole weld seam is poor, which seriously affects the strength of the weld seam

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