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A hot rolling deformation device and process method for processing magnesium alloy welded joints

A technology of welded joints and process methods, applied in welding equipment, metal processing equipment, forming tools, etc., can solve the problems of poor plasticity and low strength of welded joints, and achieve the effects of improving mechanical properties, eliminating residual stress, and improving structure

Inactive Publication Date: 2017-06-20
南京川疆科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Another technical problem to be solved by the present invention is to provide a convenient, simple, smooth, orderly, practical and efficient process for processing hot rolling deformation devices for magnesium alloy welded joints. While improving the strength and plasticity of the welded joint, the fatigue performance of the joint is improved, so as to solve the problems of low strength and poor plasticity of the welded joint in the manufacture of magnesium alloy welded structural parts

Method used

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  • A hot rolling deformation device and process method for processing magnesium alloy welded joints
  • A hot rolling deformation device and process method for processing magnesium alloy welded joints
  • A hot rolling deformation device and process method for processing magnesium alloy welded joints

Examples

Experimental program
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Effect test

Embodiment 1

[0051] (1) Selection of raw materials

[0052] The Mg-Al series AZ31 magnesium alloy plate is used as the base material for the test. The size of the test plate is 200mm×60mm×3.0mm. The welding material is AZ31 magnesium alloy welding wire with the same quality as the base material, and the specification is φ3.0mm. The main chemical composition and mechanical properties of the magnesium alloy base metal are shown in Table 1 and Table 2.

[0053] Table 1: Chemical composition of AZ31 magnesium alloy (wt.%)

[0054]

[0055] Table 2: Mechanical properties of AZ31 magnesium alloy

[0056]

[0057] (2) Welding method and equipment selection

[0058] A pair of butt welding test plates is composed of 2 plates with a size of 200mm×60mm×3.0mm. The welded test plate has a V-shaped groove of 60°, and the root gap is controlled at 3-4mm. Use acetone to remove oil stains on the surface of the test plate, sand the welding area within 20-30mm until it reveals a metallic luster, sc...

Embodiment 2

[0066] Using the same materials and methods as in Example 1, the size of the test plate is 200mm × 60mm × 3.5mm, the process parameters are: heating temperature T=300°C, the pressure parameters of the main roller group and the auxiliary roller group are respectively 350MPa and 150MPa, heat The pressing speed is 3mm / s.

[0067] Such as figure 2 In (b) after deformation at 300 °C, obvious twinning phenomenon began to appear, and very fine dynamic recrystallized grains appeared on the grain boundaries of some original grains. At this point, it can be seen that these grains are obviously elongated, indicating that dynamic recrystallization has started to take place. The room temperature tensile strength and plastic strain of sample (b) reached 176MPa and 7.8%, respectively.

Embodiment 3

[0069] Using the same materials and methods as in Example 1, the size of the test plate is 200mm × 60mm × 4.0mm, the process parameters are: heating temperature T=400°C, the pressure parameters of the main roller group and the auxiliary roller group are respectively 150MPa and 350MPa, heat The pressing speed is 6mm / s.

[0070] Such as figure 2 In (c) after deformation at 400 °C, obvious twinning phenomenon appeared, but there were also phenomena of grain recombination and grain growth, and dynamic recrystallization and grain growth coexisted. The room temperature tensile strength and plastic strain of sample (c) reached 180.8MPa and 8.3%, respectively.

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Abstract

The invention discloses a thermal rolling deformation device for processing a magnesium alloy welding joint. The thermal rolling deformation device comprises a heat-preservation heating device, a main roller group and an auxiliary roller group which are sequentially distributed and through which a welded magnesium alloy welding joint passes in sequence; the heat-preservation heating device is used for heating the welded magnesium alloy welding joint; the main roller group and the auxiliary roller group are used for pressing the heated aluminum alloy welding joint in sequence, so that the surplus height of a seam of the aluminum alloy welding joint is flattened to the beam after being subjected to at least twice rolling and is flush with a base material. According to the thermal rolling deformation device disclosed by the invention, the defects of the magnesium alloy welding joint are improved by adopting a thermal rolling deformation method, the strength and the toughness of the joint are improved, and the tensile strength can reach 225MPa and is improved by 36 percent compared with that of a welding joint which is not subjected to thermal rolling deformation; in addition, seam tissues are refined, so that the flatness of the edge of the seam is increased, and the width of the edge of the seam is more uniform; the seam is smooth in shape and is in smooth transition with the base material, so that the stress concentration phenomenon of the welding joint is eliminated, and the defects, such as air pores and slag inclusion are weakened or eliminated.

Description

technical field [0001] The invention relates to a hot rolling deformation device and a process method thereof, in particular to a hot rolling deformation device for processing magnesium alloy welded joints and a process method thereof, belonging to the field of magnesium alloy welding technology. Background technique [0002] Welding 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. [0003] 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 s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D1/02B21D37/16B23K9/167
CPCB21D1/02B21D37/16B23K9/167
Inventor 初雅杰李晓泉韩昕宸
Owner 南京川疆科技有限公司
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