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Joined body of different materials of steel material and aluminum material and method for joining the same

A technology of welding materials and aluminum materials, applied in the direction of welding/welding/cutting items, manufacturing tools, welding equipment, etc., can solve the problems of increasing welding costs

Inactive Publication Date: 2007-04-11
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, additional equipment needs to be added to the existing welding line, thus increasing the welding cost

Method used

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  • Joined body of different materials of steel material and aluminum material and method for joining the same
  • Joined body of different materials of steel material and aluminum material and method for joining the same
  • Joined body of different materials of steel material and aluminum material and method for joining the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0268] Test steels having the chemical compositions (mass %) shown in Table 1 were melted. The test steel slabs were rolled to obtain steel products with a thickness of 1.2 mm. The steel is annealed by a continuous annealing process using a temperature between about 500°C and 1000°C. Clean annealed steel by washing with water or oil. The cleaned steel was tempered to obtain high tensile strength steel of grade 980MPa. Commercially available aluminum alloy plates of A6022 (type 6000) with a thickness of 0.1 mm and 1.6 mm were used as test aluminum materials.

[0269] The steel material and the aluminum alloy plate are cut into a specimen having the shape of a transverse tensile strength test sample, and the steel material and the aluminum alloy plate specimen are welded together by spot welding to obtain a steel-aluminum welding material. The DC contact spot welding tester is used for spot welding. Combining the thickness t of each aluminum material 2 Optionally determine ...

Embodiment 2

[0286] Test steels having the chemical compositions (mass %) shown in Table 1 were melted. The test steel slabs were rolled to obtain steel products with a thickness of 1.2 mm. The steel is annealed by a continuous annealing process using a temperature between about 500°C and 1000°C. Clean annealed steel by washing with water or oil. The cleaned steel was tempered to obtain high tensile strength steel of grade 980MPa. Commercially available aluminum alloy plates of A6022 (type 6000) with a thickness of 0.1 mm (Tables 10, 11 and 12) and 1.6 mm (Table 12) were used as test aluminum materials. The steel plate (steel material) and the aluminum alloy plate (aluminum material) were cut into test pieces in the shape of transverse tensile strength test specimens specified in A3137, JIS, and tested by point welding under the welding conditions shown in Table 9. Welding The steel and aluminum alloy plate test pieces were welded together to obtain a steel-aluminum welding material.

...

Embodiment 3

[0304] Test steels having the chemical compositions (mass %) shown in Table 14 were melted. The test steel slabs were rolled to obtain steel products with a thickness of 1.2 mm. The steel is annealed by a continuous annealing treatment using a temperature between 800°C and 900°C. Clean annealed steel by washing with water or oil. The cleaned steel is tempered to adjust the strength of the steel to a suitable strength. A commercially available 1 mm thick A1050 aluminum alloy plate containing 0.05% Si and no Mn and a commercially available 1 mm thick A6022 aluminum alloy plate containing 1.10% Si and 0.07% Mn were used as test aluminum materials. The steel plate (steel material) and the aluminum alloy plate (aluminum material) are cut into test pieces having the shape of a transverse tensile strength test sample specified in A3137, JIS, and the steel material and the aluminum alloy plate are welded by spot welding The test pieces were welded together to obtain steel-aluminum ...

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Abstract

The purpose is to provide a joined body of dissimilar materials comprising steel material and aluminum material, which can be obtained by spot welding with high joining strength; and a spot welding method therefor. A joined body (3) is obtained by spot welding a particular thick steel material (1) and an aluminum material (2). The area of a nugget (5) in a spot weld is determined in relation to the plate thickness of the aluminum material (2). The area of the portion of a boundary reaction layer (6) having a thickness of 0.5-10 mum in the nugget (5) is determined in relation to the plate thickness of the aluminum material (2), and high joining strength is obtained.

Description

technical field [0001] The present invention relates to a steel-aluminum welding material formed by welding together steel and aluminum materials for the manufacture of means of transportation including automobiles and railway vehicles, machine parts and parts of building structures, And a steel-aluminum welding material manufacturing method. Background technique [0002] Typically, spot welding is used to join components of the same metal together. If members of respectively different metals, such as an aluminum member and an iron-based member, could be welded together by spot welding, the spot welding would greatly contribute to material weight reduction. In this specification, the term "aluminum" is used to refer to aluminum and aluminum alloys and the term "steel" may be used instead of "iron-based". [0003] When steel and aluminum are welded together, brittle intermetallic compounds can be produced at the steel-aluminum junction, making it very di...

Claims

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Application Information

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IPC IPC(8): B23K11/20B23K103/20
Inventor 漆原亘武田实佳子松本克史加藤淳杉崎康昭井户秀和
Owner KOBE STEEL LTD
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