Method for improving weld structure and performance of magnesium alloy

Abstract

The invention provides a method for improving a weld structure and performance of a magnesium alloy, which comprises the following steps: firstly, placing an magnesium alloy welding plate in a heat treatment furnace to carry out stress relief annealing for a certain time at a temperature of 250 DEG C to 350 DEG C; then, polishing and flattening a weld joint by adopting abrasive paper for metallograph to enable the magnesium alloy welding plate to be at the same height with a base material; and heating the magnesium alloy to a certain temperature higher than a recrystallization temperature and carrying out hot rolling after carrying out heat preservation for a certain time. The method is generally suitable for weld penetration magnesium alloy plates such as an AZ31 magnesium alloy plate, an AZ61 magnesium alloy plate, an AZ80 magnesium alloy plate and the like. Intensity of the weld joint and a heat affected zone of the welded magnesium alloy plate is obviously lower than that of the base material. By a means of carrying out hot rolling after carrying out heat preservation at a certain temperature, the method can effectively improve intensity of a magnesium alloy welding part and enables tissues and performance of the weld joint, the heat affected zone and a base metal to be consistent.

Description

technical field [0001] The invention relates to post-welding processing of metal materials, which belongs to the field of production and processing of magnesium alloy plates in non-ferrous metals, and in particular to a post-welding hot-rolling strengthening processing technology of magnesium alloys. [0002] Background technique [0003] High specific strength, specific stiffness, excellent damping performance, and many characteristics such as antimagnetic, shielding, heat dissipation, easy cutting, easy recycling, etc., make magnesium alloys widely used in the fields of electronics, electrical appliances, transportation, aerospace, aviation, and national defense military industries. highly valued. Welding is the most common processing technology to optimize product design and reduce production cost. Therefore, in order to give full play to the performance of magnesium alloy in all aspects, it must be supplemented by mature welding technology. During World War II, the avi...

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Problems solved by technology

[0007] Aiming at the above-mentioned deficiencies in the prior art, the present invention solves the problem that the strength of the magnesium alloy weld seam is poor and the weld seam affects the appearance, and provides a method for improving the microstructure and performance of the weld seam-heat-affected zone of the magnesium alloy plate, so that it can be compared with the basic The structure and properties of materials tend to be consistent

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