Magnesium alloy weld joint surface nanocrystallization device and method

Abstract

The invention discloses a magnesium alloy weld joint surface nanocrystallization device and method. The device comprises a plate feeding roller wheel set, a welding gun, a water chilling device, a shot blasting device, a welding platform and a shaping rolling wheel set. The welding gun and the shot blasting device are arranged above a magnesium alloy plate. A self-developed magnesium alloy welding wire is arranged in the welding gun. The water chilling device is arranged below the magnesium alloy plate. A base material is fed into a welding channel through the roller wheel set and then is subjected to butt welding through an argon tungsten-arc welding method, and a weld joint obtained after welding is completed is subjected to water chilling and shot blasting treatment. The magnesium alloy welding wire of the device promotes dispersed precipitation of a strengthening phase in a non-equilibrium solidification welding connector structure, the water chilling device has a fast cooling function on a melting pool just formed, grains are refined, and the mechanical property of the magnesium alloy weld joint is improved.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a device and a method for nanometerizing the surface of a magnesium alloy weld seam. Background technique [0002] Welding technology is a key processing technology for the manufacture of magnesium alloy products, but the welding performance of magnesium alloys is not good, and it is difficult to achieve reliable connections. For this reason, magnesium alloy structural parts and the connection between magnesium alloy and other material structural parts have become a technical bottleneck restricting the application of magnesium alloys and one of the key technologies to be solved urgently. The reliability of magnesium alloy welded joints has become an urgent problem in its application. At present, magnesium alloys are being used in the manufacture of many load-bearing structural parts, such as magnesium alloy steering wheel skeletons in automobile manufacturing, automa...

AI Technical Summary

Problems solved by technology

At present, different welding methods and means have been used in research to eliminate or weaken the above-mentioned shortcomings of magnesium alloy welded joints, but these methods have very limited ability to solve the above-mentioned problems

Due to the characteristics of high thermal conductivity, large expansion coefficient, lower melting point and boiling point of magnesium alloy, it is easy to produce overheated structure and coarse grain in the magnesium alloy weld and near the seam area, which will directly affect the joint quality. Mechanical properties, magnesium can also strongly combine with nitrogen in the air to form brittle nitrides, reducing the mechanical properties of joints

Images