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Aluminum alloy solder for powder metallurgy aluminum alloy welding and preparation method thereof

A powder metallurgy, aluminum alloy technology, applied in welding equipment, welding/cutting media/materials, welding/welding/cutting items, etc., can solve the problems of low tensile strength of joints, inconvenient practical application, and holes in the joint area. , to achieve the effect of improving the plastic deformation ability of hot rolling, avoiding discontinuity and promoting diffusion

Active Publication Date: 2021-06-22
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this solder is used for powder metallurgy aluminum alloy welding, although welding cracks can be avoided, there are holes in the joint area, which reduces the welding strength, and the tensile strength of the joint is lower than that of the base metal.
Moreover, the aluminum-based interlayer alloy foil strip prepared by the rapid cooling method is brittle and inconvenient for practical application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Aluminum alloy solder for powder metallurgy aluminum alloy welding, its weight percentage is: aluminum 80%, silicon 11%, copper 5.5%, magnesium 3.38%, tantalum 0.12%. The metal powders of each component are weighed and mixed according to the percentage, pressed into a powder body with a pressure of 200MPa, and then sintered at a temperature of 560°C for 20 minutes in a nitrogen-filled environment, and multi-pass rolling is carried out at 350°C with a hot rolling equipment , to obtain aluminum alloy foil strip solder with a thickness of 80mm.

[0016] Place the aluminum alloy solder for powder metallurgy aluminum alloy welding with a thickness of 80mm between the welding surfaces of the powder metallurgy aluminum alloy sintered body, press the surface to be welded under a pressure of 5 MPa, heat to 590 ° C for 2 minutes, and complete the powder metallurgy aluminum alloy. alloy welding. The tensile test of the powder metallurgy aluminum alloy joint was carried out by a u...

Embodiment 2

[0018] Aluminum alloy solder for powder metallurgy aluminum alloy welding, its weight percentage is: aluminum 82%, silicon 7%, copper 8.5%, magnesium 2.4%, tantalum 0.1%.

[0019] The metal powders of each component are weighed and mixed according to the percentage, pressed into a powder body with a pressure of 200MPa, and then sintered at a temperature of 560°C for 20 minutes in a nitrogen-filled environment, and multi-pass rolling is carried out at 350°C with a hot rolling equipment , to obtain aluminum alloy foil strip solder with a thickness of 120mm.

[0020] Place the aluminum alloy solder for powder metallurgy aluminum alloy welding with a thickness of 80mm between the welding surfaces of the powder metallurgy aluminum alloy sintered body, press the surface to be welded under a pressure of 5 MPa, heat to 590 ° C for 2 minutes, and complete the powder metallurgy aluminum alloy. alloy welding. The tensile test of the powder metallurgy aluminum alloy joint was carried out...

Embodiment 3

[0022] Aluminum alloy solder for powder metallurgy aluminum alloy welding, its weight percentage is: aluminum 84%, silicon 6%, copper 6.4%, magnesium 3.5%, tantalum 0.1%.

[0023] The metal powders of each component are weighed and mixed according to the percentage, pressed into a powder body with a pressure of 200MPa, and then sintered at a temperature of 560°C for 20 minutes in a nitrogen-filled environment, and multi-pass rolling is carried out at 350°C with a hot rolling equipment , Obtain aluminum alloy foil strip solder with a thickness of 100mm.

[0024] Place the aluminum alloy solder for powder metallurgy aluminum alloy welding with a thickness of 80mm between the welding surfaces of the powder metallurgy aluminum alloy sintered body, press the surface to be welded under a pressure of 5 MPa, heat to 590 ° C for 2 minutes, and complete the powder metallurgy aluminum alloy. alloy welding. The tensile test of powder metallurgy aluminum alloy joints was carried out by us...

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Abstract

The invention discloses an aluminum alloy solder used for powder metallurgy aluminum alloy welding and a preparation method thereof. 1%~3.5%, tantalum 0.05%~0.12%. The aluminum alloy solder of the present invention can eliminate holes in the powder metallurgy aluminum alloy welding joint area, form a continuous and uniform joint, the tensile strength of the joint reaches the level of the parent material, and can be widely used in welding of various powder metallurgy aluminum alloy products.

Description

technical field [0001] The invention relates to a solder, in particular to a solder suitable for powder metallurgy aluminum alloy welding and a preparation method thereof. Background technique [0002] Due to the advantages of uniform material structure, no macro segregation, and one-time molding, powder metallurgy aluminum alloys gradually replace cast and wrought aluminum alloys in the automotive industry and aerospace. However, the inherent hole defects of powder metallurgy aluminum alloy after sintering make its weldability far lower than that of cast and forged aluminum alloy. On the one hand, the hole changes the thermal conductivity, thermal expansion coefficient and hardenability of the sintered body, making the weld, heat Cracks may occur in both the affected zone and the base metal; on the other hand, the pores will absorb impurities and oxides, which not only leads to unstable welding, but also easily forms solidification cracks and lamellar tears. This limits th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/28B23K103/10
CPCB23K35/0255B23K35/286B23K2103/10
Inventor 王学刚袁兴栋
Owner SHANDONG JIANZHU UNIV