Non-contact laser welding technique

Abstract

The invention relates to a non-contact laser welding technique which comprises the following steps: a. placing tin balls in a container filled with nitrogen; b. melting the tin balls with a laser; and c. blowing the molten tin balls to the position to be welded on the workpiece under the pressure of nitrogen. The application of non-contact laser system: common welding techniques, which mainly carry out welding in an electric soldering iron heating mode, are contact welding techniques; and by adopting laser welding, the invention ensures the welding quality, solves and realizes the non-contact welding technique. The invention uses colophony-free welding technique to prevent colophony from polluting an object, thereby enhancing the welding quality; the invention can use an auxiliary image vision system to locate the solder position, and the positioning accuracy can be below 0.015 millimeter, thereby having the advantages of quick positioning and high accuracy; and nitrogen drives tin balls to be ejected out of the tin ball container with high speed and stability, and thus, the invention can also prevent oxidation in the process of high temperature melting and solidification.

Description

technical field [0001] The invention relates to a welding process, in particular to a non-contact laser welding process. Background technique [0002] In the prior art, the welding between the columnar metal and the metal plane is mainly based on artificial alignment and artificial welding. This welding method mainly has the following disadvantages: [0003] 1. The alignment accuracy is difficult to guarantee, the welding speed is slow, and the welding quality is unstable; [0004] 2. Welding is mainly carried out with electric soldering iron, using flux rosin to achieve rapid melting and welding, which will cause serious rosin pollution. In many very high-end industries, rosin pollution is absolutely not allowed, and may cause serious product pollution. quality; [0005] Laser technology uses a polarizer to reflect the beam generated by the laser to concentrate it in the focusing device to generate a beam of huge energy. If the focus is close to the workpiece, the workpi...

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Problems solved by technology

[0003] 1. The alignment accuracy is difficult to guarantee, the welding speed is slow, and the welding quality is unstable;

[0004]2. Welding is mainly carried out by electric soldering iron, using flux rosin to achieve rapid melting and welding, which will cause serious rosin pollution. In many very high-end industries, rosin Pollution is absolutely not allowed, it may cause serious product pollution and affect the quality;

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