High-strength laser transmission connecting method

Abstract

The invention discloses a high-strength laser transmission connecting method, belongs to the technical field of laser transmission welding, and especially relates to the laser transmission welding between polymers. The method comprises the following steps: treating a to-be-welded surface of a metal material by adopting a drilling machining method and forming pits on the surface; at a welding moment, taking the metal with the surface subjected to the drilling machining treatment as a lower-layer light-absorbing material and taking the polymer as an upper-layer light-transmitting material; adopting a lapped connecting mode and using a restraint layer for clamping and applying welding pressure; and using a semiconductor laser device for performing laser transmission welding, causing the surface temperature to quickly reach the melting point of the upper-layer polymer and melting the surface of the polymer. The pits are formed on the polymer surface through drilling mechanical treatment, so that under the action of a welding pressure, the melted polymer flows into the pits, an occlusion interface with a riveted structure is formed at a welding joint, and the high-strength laser transmission welding is realized. The high-strength laser transmission connecting method can be widely applied to the field of the laser transmission welding with higher demand on the connecting strength.

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. A pit with a certain depth is formed on the metal surface by drilling and machining holes. During laser transmission welding, the molten light-transmitting polymer flows into the pit under the action of welding pressure, forming a riveted structure at the weld. The occlusal interface increases the connection contact area between the polymer and the polymer, thereby promoting the better combination of the gold polymer and the polymer, and obtaining high-strength laser transmission welding. Background technique [0002] At present, laser transmission welding technology is a high-tech processing with many advantages such as airtightness, watertightness, fast welding speed, high precision, high weld strength, no flash, no residue, no vibration, small thermal stres...

AI Technical Summary

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

Images