Novel welding method for laser welding of magnesium alloy

Abstract

The invention discloses a novel welding method for the laser welding of a magnesium alloy. The method comprises the following steps of: adding an organic solvent into SiO2 active agent powder to form paste; coating the pasty SiO2 active agent on the surface of a part to be welded of the magnesium alloy uniformly to form a SiO2 active agent coating; and performing laser welding after the organic solvent in the SiO2 active agent coating is violated. By the method, due to high absorption capacity and low reflectivity of the SiO2 active agent coating for a laser beam, the loss rate of laser energy is reduced, the transmission efficiency of the energy is increased, and the energy utilization rate of the laser beam is remarkably improved; the energy utilization rate of the laser beam is remarkably improved, so that the fusion depth of a welding seam is remarkably increased, and the mechanical property of a welding joint can be obviously improved; and simultaneously, a low-power laser welding process can be utilized, so that the welding cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of laser welding, and in particular relates to a novel welding method for laser welding of magnesium alloys. Background technique [0002] Magnesium alloy has a series of advantages such as low density, high specific strength, good electromagnetic shielding and easy recycling. It is called the green engineering material of the 21st century and is widely used in transportation, consumer electronics, national defense and aerospace. and other fields. China, the United States, Japan and the European Union regard the research and application of light metals represented by magnesium alloys as the key to maintaining cutting-edge advantages in the new century. With the rapid development of the automobile industry, the continuous improvement of energy saving and consumption reduction requirements, and the increasingly stringent safety and environmental protection regulations, the requirements for automobile lightwei...

AI Technical Summary

Problems solved by technology

This is due to the high reflectivity of the surface of the magnesium alloy to the laser beam and the low energy utilization rate of laser welding, which lead to a sharp increase in the cost of the equipment as the thickness of the workpiece to be welded increases. These shortcomings limit the application of laser welding technology in magnesium alloys. Application in Alloy Welding

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