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, carrying out 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 of the 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 butting two thin metal plates. Background technique [0002] For the welding of thin plate materials with a thickness of less than 0.5 mm, the deformation is large during the welding process, the starting point and the end point of the base material are severely lost, the welding is difficult, and the requirements are demanding, so it is classified into the precision welding category by the welding industry. The difficulty of welding is that the thickness of the material is thin (usually only a few millimeters, some even less than 0.1mm), and it is extremely susceptible to all aspects of the welding process, resulting in plate welding through and thermal deformation, while thin plate materials are many It is applied to precision devices, so it has strict requirements on deformation and welding strength, especially in seam welding occasions that require tightness, conventi...

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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