Biaxial bending deformation device and processing method for processing welded joint

Abstract

The invention provides a biaxial bending deformation device and a processing method for processing a welded joint. The biaxial bending deformation device comprises a heating heat preservation device, a plate feeding roller group, a plurality of pairs of curved roller groups, a plurality of pairs of rolling roller groups and a passage penetrating through all heat preservation layers, plate feeding roller group, curved roller groups and rolling roller groups, wherein the passage is divided into a horizontal section and a curved section, the heating heat preservation device, the plate feeding roller group and the rolling roller groups are arranged on the horizontal section, the curved roller groups are arranged on the curved section, the curved section comprises a plurality of concave curved surfaces and convex curved surfaces, which are alternately arranged, the curved roller groups include an upper curved roller group and a lower curved roller group, the upper curved roller group is arranged on the convex curved surface, and the lower curved roller group is arranged on the concave curved surface. By adopting the biaxial bending deformation device, a weld seam of the welded joint can be extended to certain extent, so that the residual stress can be reduced, and crystalline grains can be refined; and the biaxial bending deformation device is particularly suitable for the welded joint with relatively low mechanical performance.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a bidirectional bending deformation device for processing welded joints and a processing method thereof. Background technique [0002] Welding is a key processing technology for the manufacture of soft alloy products, especially magnesium alloy products, but the welding performance of magnesium alloy is not good, and it is difficult to achieve reliable connection. 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 skelet...

AI Technical Summary

Problems solved by technology

[0003] ①The discontinuity of the shape of the joint will inevitably cause stress concentration at the junction of the reinforcement and the base metal;

[0004] ②The discontinuity of the joint structure, the grain structure of the heat-affected zone of the magnesium alloy joint is coarser than that of the weld and the base metal, and the structure of the entire joint is uneven and discontinuous;

[0005] ③ Due to the shrinkage of the weld metal, residual stress will be generated near the joint, which will reduce the mechanical properties of the joint;

[0006] ④ There are welding defects in the joints. Due to the active chemical properties of magnesium alloys, welding defects such as pores and slag inclusions will inevitably appear during the welding process;

[0007] ⑤ The appearance of the joint is uneven and unsightly

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

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