Laser transmission composite connecting method

Abstract

The invention discloses a laser transmission composite connecting method, which belongs to the technical field of laser transmission welding and particularly relates to the laser transmission welding of metal and polymers. According to the method, firstly, the surface of the metal material to be welded is subjected to electric spark processing, concave pits are formed at the surface of the metal material, during the welding, the metal with the surface subjected to the electric spark processing is used as a lower layer light absorption material, the polymers are used as an upper layer light transmission material, a lap joint connection form is adopted, a restraining layer is used for clamping, in addition, the welding pressure is exerted, a semiconductor laser is used for carrying out laser transmission welding, the surface temperature can fast reach the melting point of the upper layer polymers, the surface of the polymers is melt, the surface of the lower layer metal is subjected to the electric spark processing, the concave pits are formed, so the melt polymers at the surface flow into the concave pits under the effect of the welding pressure, an engaging interface of the similar riveting structure is formed at the welding line part, and the improvement of the connection intensity of the laser transmission welding can be realized. The laser transmission composite connecting method can be widely applied to the field of the laser transmission welding with higher connection intensity requirements.

Description

technical field [0001] The invention belongs to the technical field of laser transmission welding, in particular to a method for laser transmission composite connection. The method of electric spark treatment forms pits on the metal surface. During laser transmission welding, the molten polymer flows into the pits under the action of welding pressure, forming a occlusal interface similar to a riveting structure at the weld, increasing the metal and polymer. The connection contact area of ​​the material can be improved, so that the metal and the polymer can be better combined with each other, and the connection strength of the laser transmission welding can be improved. Background technique [0002] At present, laser transmission welding technology is widely used in the field of welding processing of the same and dissimilar materials such as polymers and polymers, and polymers and metals. Its characteristics are: fast, non-contact, accurate, small heat-affected zone, etc. Wi...

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Problems solved by technology

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