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Stirring friction-welding technique capable of increasing weldability of aluminum base composite material

An aluminum-based composite material and friction-stir technology, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve problems such as unstable fine-grain structure, abnormal grain growth, and reduced joint performance, and achieve Improve mechanical properties, improve weldability, and reduce wear

Active Publication Date: 2011-01-26
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

However, since the fine-grained structure of the friction stir welded seam is unstable, abnormal grain growth will occur during the high-temperature solution treatment (Journal of Materials Science, vol.37, No.3(2002) p.473 -480), resulting in reduced joint performance

Method used

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  • Stirring friction-welding technique capable of increasing weldability of aluminum base composite material
  • Stirring friction-welding technique capable of increasing weldability of aluminum base composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] An 8mm thick 15vol.% SiCp / 2009Al composite extruded sheet was used, and friction stir welding was carried out under the welding parameters of a tool speed of 600 rpm and a welding speed of 50 mm / minute. Microstructure inspection showed that the surface of the weld was relatively smooth, the interior was dense and there were no defects, and the welding tool was only slightly worn. T4 treatment (solution treatment at 500°C for 1 hour, water quenching, and room temperature for 2 weeks) was performed on the welded workpiece, and the fine-grained structure of the weld zone did not coarsen significantly. The transverse tensile strength of the composite joint is 445MPa, the yield strength is 324MPa, and the elongation rate is 4%.

Embodiment 2

[0028] The 8mm thick 15vol.%SiCp / 2009Al composite extruded sheet was used for friction stir welding after annealing at 420°C for 6 hours. The welding parameters were: tool rotation speed 800 rpm, welding speed 100 mm / min. Microstructure inspection showed that the surface of the weld was relatively smooth, the interior was dense and there were no defects, and the welding tool was only slightly worn. T6 treatment (solution treatment at 500°C for 1 hour, water quenching, aging at 170°C for 5 hours) was performed on the welded workpiece, and the fine-grained structure of the weld zone did not coarsen significantly. The transverse tensile strength of the composite joint is 460MPa, the yield strength is 345MPa, and the elongation is 4%.

Embodiment 3

[0032] A 6mm thick 20vol.%SiCp / 2024Al composite material was used to roll the plate, and the friction stir welding was carried out under the welding parameters of the tool speed of 600 rpm and the welding speed of 80 mm / minute. The surface of the welding seam is relatively smooth, and the interior is dense without defects, and the welding tools are only slightly worn. T4 treatment (solution treatment at 502°C for 1 hour, water quenching, and room temperature for 2 weeks) is performed on the welded workpiece. The fine grain structure of the weld zone does not have abnormal grain growth. The transverse tensile strength of the composite joint is 434MPa, the yield strength is 316MPa, and the elongation is 4%.

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Abstract

The present invention provides a stirring, rubbing and welding process for improving the solderability of aluminum base composite materials. The process comprises the following steps: directly stirring, rubbing and welding the aluminum base composite materials under a soft condition, and then carrying out strengthening heat treatment on welded workpieces. The welding process can obviously improvethe welding performance of the aluminum base composite materials, reduce tool wear and improve the mechanical property of composite material joints.

Description

Technical field [0001] The invention relates to a metal material, and in particular provides a friction stir welding process for improving the weldability of an aluminum-based composite material, which is suitable for heat-treatable and strengthened aluminum-based composite materials. Background technique [0002] The ceramic particle discontinuous reinforced aluminum matrix composite material cannot be welded by the traditional fusion welding process due to the addition of ceramic particles. The invention of friction stir welding technology provides the possibility for the connection of aluminum-based composites. Research has shown that high-quality composite joints can be obtained under optimized process parameters. However, even at high temperatures, the deformability of the composite material is much lower than that of the aluminum alloy, and the ceramic particles in the composite material will have a certain wear effect on the welding tool (Scripta Materialia, vol. 45, No. 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K20/24C21D9/50B23K103/10
Inventor 马宗义冯艾寒肖博律
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI