Laser-transmission welded connection method

Abstract

The invention discloses a laser-transmission welded connection method, which belongs to the technical field of laser transmission welding, and particularly relates to laser transmission welding between metals and polymers. The laser-transmission welded connection method comprises the following steps of: firstly, carrying out micro-ultrasonic electrolysis combined machining process on the to-be-welded surface of a metal material so as to form concave pits in the surface of the metal material; connecting a lower-layer light absorption material which is the metal the surface of which is subjected to the micro-ultrasonic electrolysis combined machining process, and an upper-layer light absorption material which is a polymer in an overlapping manner, clamping the two light absorption materials by a restraint layer, and applying a welding pressure to the light absorption materials; and carrying out laser transmission welding on the light absorption materials by a semiconductor laser so as to enable a surface temperature to fast reach a melting point of the upper-layer polymer and the surface of the polymer to be melted, thus forming an holding-on interface with a riveted structure at a weld joint and improving the connecting strength of laser-transmission welding since the concave pits are formed in the surface subjected to the micro-ultrasonic electrolysis combined machining process of the lower-layer metal, and the polymer with the melted surface layer flows into the concave pits under the action of the welding pressure.

Description

technical field [0001] The invention belongs to the technical field of laser transmission welding, in particular to a method capable of improving the connection strength of metal and polymer laser transmission welding. The micro-ultrasonic electrolytic composite processing method is used to form pits on the metal surface. During laser transmission welding, the molten polymer flows into the pits under the action of welding pressure, forming a riveting interface at the weld, increasing the metal and The connection contact area of ​​the polymer is improved, thereby achieving an increase in the connection strength of the laser transmission welding. 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. With the development of las...

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Problems solved by technology

The document "The Effect of Laser Shock Surface Strengthening on the Mechanical Properties of Welded Joints" describes a method for surface strengthening treatment of welded joints to improve tensile strength. This method is to improve the strength of welded connections after welding. In transmission welding Inevitably cause damage to the weld seam after welding

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