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High-strength aluminum/magnesium dissimilar alloy connector containing intermediate layer, and preparation method thereof

An intermediate layer, high-strength technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve problems such as the decline in mechanical properties of joints, achieve the effects of improving organizational structure, improving mechanical properties, and reducing welding heat input

Inactive Publication Date: 2019-07-09
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problem that hard and brittle Al-Mg intermetallic compounds are easily formed in the aluminum / magnesium dissimilar alloy joints prepared by the current connection technology, which leads to the decline of the mechanical properties of the joints, the present invention provides a high-strength aluminum / magnesium dissimilar alloy joint and its preparation method

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  • High-strength aluminum/magnesium dissimilar alloy connector containing intermediate layer, and preparation method thereof
  • High-strength aluminum/magnesium dissimilar alloy connector containing intermediate layer, and preparation method thereof
  • High-strength aluminum/magnesium dissimilar alloy connector containing intermediate layer, and preparation method thereof

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preparation example Construction

[0027] A method for preparing a high-strength aluminum / magnesium dissimilar alloy joint containing an intermediate layer in the present invention comprises the following steps:

[0028] The first step: Pretreatment before welding

[0029] Pre-treat the surface of the aluminum alloy sheet and magnesium alloy sheet to be welded, and polish it on 500#, 1000#, 1500#, 2000# and 2500# water sandpaper in turn, and then ultrasonically clean it in acetone and alcohol for 10-20 minutes, and cool air Blow dry; overlap the plates to be welded, from bottom to top are magnesium alloy, Zr foil and aluminum alloy, the size of aluminum alloy plate and magnesium alloy plate is 300mm×150mm×3mm, and the width of the overlapping area is 50-75mm , preferably 55-70 mm, the thickness of the Zr foil is 0.05-0.25 mm, preferably 0.10-0.20 mm, the length and width of the Zr foil are consistent with the size of the overlapping area, and then the welding material after the overlapping is fixed.

[0030] S...

Embodiment 1

[0036] The first step: Pretreatment before welding

[0037] Pre-treat the surface of the 5052 aluminum alloy plate and AM50 magnesium alloy plate to be welded, and polish it on 500#, 1000#, 1500#, 2000# and 2500# water sandpaper in turn, and then ultrasonically clean it in acetone and alcohol for 15 minutes, and cool air Blow dry; Lap the plates to be welded, from bottom to top, they are magnesium alloy, Zr foil and aluminum alloy. The thickness of the foil is 0.10mm, the length and width of the Zr foil are consistent with the size of the overlapping area, and then the welding consumables after the overlapping are fixed.

[0038] Step Two: Friction Stir Welding

[0039] Fix the welding consumables after the first step of overlapping on the welding workbench. During the welding process, immerse the welding consumables in a water cooling device to cool down. The temperature of the cooling water is 15°C; then use a small gantry friction stir welding machine for welding. Carry o...

Embodiment 2

[0052] The first step: Pretreatment before welding

[0053] The surface of the 5086 aluminum alloy sheet and the AZ31 magnesium alloy sheet to be welded are pretreated, polished on 500#, 1000#, 1500#, 2000# and 2500# water sandpaper in turn, and then ultrasonically cleaned in acetone and alcohol for 15 minutes, cold air Blow dry; Lap the plates to be welded, from bottom to top, they are magnesium alloy, Zr foil and aluminum alloy. The thickness of the foil is 0.15mm, the length and width of the Zr foil are consistent with the size of the overlapping area, and then the welding consumables after the overlapping are fixed.

[0054] Step Two: Friction Stir Welding

[0055] Fix the welding consumables after the first step of overlapping on the welding workbench. During the welding process, immerse the welding consumables in a water cooling device to cool down. The temperature of the cooling water is 20°C; then use a small gantry friction stir welding machine for welding. Carry ou...

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Abstract

The invention relates to a high-strength aluminum / magnesium dissimilar alloy connector containing an intermediate layer, and a preparation method thereof. The connector sequentially comprises an aluminum alloy, a Zr intermediate layer and a magnesium alloy from top to bottom, wherein the intermediate layer is a Zr foil with the thickness ranging from 0.05 to 0.25mm. According to the preparation method, the combined action of a solid-phase welding technology, the intermediate layer and environment cooling is adopted for preparing a dissimilar light metal connector, namely, the aluminum / magnesium dissimilar alloy connector containing the Zr intermediate layer is prepared in a water-cooling environment by utilizing a friction stir welding technology, so that the target dissimilar alloy is obtained. According to the high-strength aluminum / magnesium dissimilar alloy connector containing the intermediate layer, and the preparation method thereof provided by the invention, the welding heat input is reduced, and a tissue structure of the connector is improved, so that a mechanical property of the connector is improved.

Description

technical field [0001] The invention belongs to the technical field of connection of dissimilar materials, and in particular relates to a preparation method of dissimilar joints of aluminum alloy and magnesium alloy. Background technique [0002] Automobile lightweight is of great significance to reduce emissions, reduce fuel consumption, and promote the sustainable development of the automobile industry, and has become an important development direction of automobile technology at this stage. Studies have shown that for every 10% reduction in vehicle weight, fuel consumption will decrease by 6% to 8%, and exhaust emissions will decrease by 4%. It can be seen that vehicle lightweight is an effective way to promote vehicles to achieve energy saving and emission reduction. [0003] Optimizing the body structure, adopting advanced manufacturing technology, and applying high-strength and lightweight materials are the three major ways to achieve lightweight vehicles. Among them, ...

Claims

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Application Information

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IPC IPC(8): B23K33/00B23K20/12B23K20/233B23K20/24
CPCB23K20/122B23K20/2333B23K20/24B23K33/00
Inventor 马英磊郑洋张建军陈勇
Owner HEBEI UNIV OF TECH
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