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Differential-thickness-method friction stir welding process for realizing dissimilar material connection

A technology of friction stirring and dissimilar materials, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve the problems of low industrial practical applicability, low service performance of joints, poor welding quality, etc., and achieve wide industrial applications Prospect, elimination of premature formation of fatigue cracks, effect of improving weld formability

Inactive Publication Date: 2021-10-22
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a friction stir welding process of differential thickness method for realizing the connection of dissimilar materials, which solves the problems of high welding cost of dissimilar materials, poor welding quality, low service performance of joints and low industrial practical applicability in the prior art And other issues

Method used

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  • Differential-thickness-method friction stir welding process for realizing dissimilar material connection
  • Differential-thickness-method friction stir welding process for realizing dissimilar material connection
  • Differential-thickness-method friction stir welding process for realizing dissimilar material connection

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Use 5.6mm thick 1060 pure aluminum rolling plate with tensile strength of 120MPa and 5mm thick low carbon steel Q345 with tensile strength of 520MPa. The welding tool is made of H13 steel material, the diameter of the shoulder is 22 mm, the stirring needle is a cylindrical threaded needle, the diameter is 6 mm, and the length of the needle is 5 mm. During the welding process, the distance between the edge of the stirring needle and the low carbon steel is 0 mm. A reduction of 0.5 mm (shoulder 0.1 mm above the mild steel) and welding parameters of 1000 rpm of the welding tool and a travel speed of 100 mm / min resulted in defect-free welded joints. Microstructure observation shows that the interface is relatively straight and well bonded, and no large-sized steel particles appear in the weld nugget area ( image 3 ). Tensile tests at room temperature showed that the fracture of the joint was in the heat-affected zone on the aluminum side, and the tensile strength was 100 ...

Embodiment 2

[0044] Use 20.2mm thick 1060 pure aluminum plate with tensile strength of 110MPa and 20mm thick low carbon steel Q345 plate with tensile strength of 520MPa. The welding tool is made of H13 steel material, the diameter of the shoulder is 30mm, the stirring needle is a cylindrical threaded needle, the diameter is 14mm, and the length of the needle is 20mm. During the welding process, the edge of the stirring needle is 0.3mm away from the low carbon steel, refer to the shoulder of the aluminum plate A reduction of 0.2 mm (shoulder 0.1 mm above the mild steel) and welding parameters of 800 rpm of the welding tool and a travel speed of 50 mm / min resulted in defect-free welded joints. Microstructure observation shows that the interface is relatively straight, and no large-sized steel particles appear in the weld nugget area. The tensile test at room temperature showed that the fracture of the joint was in the heat-affected zone on the aluminum side, and the tensile strength was 95MP...

Embodiment 3

[0048] Using 2 mm thick 7075-T651 aluminum alloy with a tensile strength of 575 MPa and 1.8 mm thick zirconium-based amorphous (Zr 55 Cu 30 Al 10 Ni 5 )plate. The welding tool is made of M42 steel material, the diameter of the shoulder is 18mm, the stirring needle is a cylindrical threaded needle, the diameter is 4mm, and the length of the needle is 1.8mm. During the welding process, the edge of the stirring needle is 0.3mm away from the low carbon steel, referring to the shoulder of the aluminum plate A reduction of 0.1 mm (shoulders 0.1 mm above the amorphous sheet) and welding parameters of 2000 rpm of the welding tool and a travel speed of 200 mm / min resulted in defect-free welded joints. Microstructure observation shows that the interface is relatively straight, and no amorphous particles appear in the weld nugget area. The tensile test at room temperature showed that the fracture of the joint was in the heat-affected zone on the aluminum side, and the tensile strengt...

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Abstract

The invention discloses a different-thickness-method friction stir welding process for realizing dissimilar material connection, and belongs to the technical field of dissimilar material welding. According to the process, the mode that the thickness of low-melting-point metal is larger than that of high-hardness / high-melting-point materials is adopted, a stirring needle is completely biased, wear and breakage of a welding tool are avoided, and meanwhile heat input is improved through a high tool rotating speed and / or large shaft shoulder rolling reduction to promote metallurgical bonding between dissimilar materials. The process solves the problems that in the prior art, when dissimilar materials are connected, weld joints are difficult to form, welding quality is poor, welding tools are damaged, and cost is high. By means of the process, the mechanical property of a dissimilar material welding joint can be obviously improved, and the process is particularly suitable for welding between low-melting-point metal (aluminum, aluminum alloys, magnesium, magnesium alloys and the like) and high-hardness / high-melting-point materials (steel, titanium alloys, copper alloys, amorphous materials and ceramic).

Description

Technical field: [0001] The invention relates to the technical field of material welding, in particular to a friction stir welding process of different thickness method for realizing the connection of dissimilar materials, which is suitable for welding dissimilar materials, especially suitable for low melting point metals (aluminum, aluminum alloy, magnesium, magnesium alloy) and high Welding between hard / high melting point materials (steel, titanium alloys, copper alloys, amorphous, ceramics). Background technique: [0002] The connection of dissimilar materials can give full play to the respective advantages of the two materials, and has a very wide range of applications in industry, especially low melting point metals (aluminum, aluminum alloys, magnesium, magnesium alloys, etc.) and high hardness / high melting point metals (steel, Copper alloys, titanium alloys, ceramics, superalloys, amorphous, etc.) are the most critical connection applications. However, due to the gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/24B23K103/18
CPCB23K20/122B23K20/24B23K2103/18
Inventor 薛鹏倪丁瑞马宗义吴利辉肖伯律张振
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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