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Method for controlling laser welding

A technology for laser welding and workpieces to be welded, applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., which can solve the problems of low welding strength of dissimilar materials, high probability of explosion point, affecting product welding performance and appearance, etc. , to achieve the effect of improving welding performance and improving product quality

Active Publication Date: 2015-12-02
UNITED WINNERS LASER CO LTD
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Problems solved by technology

[0002] At present, the most commonly used welding technology is laser welding. Laser welding has high requirements for the cooperation of the workpiece to be welded. The welding position must be within the focus range of the laser beam, and the welding strength of dissimilar materials is low, which limits their application value.
Laser welding can be applied to the automotive power battery industry. The material of the power battery casing is generally 3 series aluminum alloys. However, the traditional laser welding of aluminum alloys has problems such as high probability of explosion, serious pores, and serious pinholes, and the matching accuracy of the products (splicing gap , height difference) directly affect product welding performance and appearance

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Embodiment Construction

[0009] In order to make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects obtained easy to understand, the specific implementation manners of the present invention will be further described below in conjunction with the specific drawings.

[0010] The invention discloses a method for controlling laser welding, comprising the following steps:

[0011] a) Measure the weld width w of the workpiece to be welded;

[0012] b) Establish the circular polar coordinate mode and the linear polar coordinate mode, and use the two fitting trajectories as the trajectory path of laser welding: x 0 =x 1 +Δ*cosβ,y 0 =y 1 +Δ*sinβ, x=x 0 +R*cosα,y=y 0 +R*sinα; where x 0 with y 0 is the coordinate of the point on the line, x 1 with y 1 The coordinates of the starting point of the straight line, Δ is the point distance of the straight line, β is the inclination angle of the straight line, R is the shaking radius, α is the p...

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Abstract

The invention discloses a method for controlling laser welding. The method comprises the following steps that 1, the weld seam width w of a workpiece to be welded is measured; 2, the locus of laser welding is controlled as x0=x1+delta*cos beta, y0=y1+delta*sin beta, x=x0+R*cos alpha, y=y0+R*sin alpha, wherein w=2R+phi, x0 and y0 serve as coordinates of a point on a straight line, x1 and y1 serve as starting point coordinates of the straight line, delta serves as a point distance of the straight line, beta serves as an inclination angle of the straight line, R serves as a shaking radius, alpha serves as a polar angle, x and y serve as coordinates of a point on a circle (that is a helical line locus), phi serves as a welding point diameter, and delta is smaller than phi. According to the method for controlling laser welding, the locus of a welding helical line is adjusted by adjusting the shaking radius and the point distance for changes of the weld seam width, therefore, a molten pool can flow more fully, the problems of weld seam depression, undercut, point burst and needle holes which are brought by traditional laser welding can be effectively solved, the welding performance is improved, and the quality rate of products is improved.

Description

technical field [0001] The invention relates to the field of laser welding, and more precisely, relates to a control method for helical welding of galvanometers in lasers. Background technique [0002] At present, the most commonly used welding technology is laser welding. Laser welding has high requirements for the cooperation of the workpiece to be welded. The welding position must be within the focus range of the laser beam, and the welding strength of dissimilar materials is low, which limits their application value. Laser welding can be applied to the automotive power battery industry. The material of the power battery casing is generally 3 series aluminum alloys. However, the traditional laser welding of aluminum alloys has problems such as high probability of explosion, serious pores, and serious pinholes, and the matching accuracy of the products (splicing gap , height difference) directly affect the welding performance and appearance of the product. Contents of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/24B23K26/32B23K103/10
CPCB23K26/24B23K2103/10
Inventor 牛增强余林金胡玲
Owner UNITED WINNERS LASER CO LTD
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