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Preparation method of titanium and aluminium dissimilar metal thick plate overlapping structure

A technology of dissimilar metals and joining structures, applied in metal processing equipment, welding equipment, metal processing and other directions, can solve the problems of cracking and welding of cladding, difficult dissimilar metal structures, difficulties, etc., to achieve reliable structural quality, avoid direct contact, Simple and controllable preparation process

Inactive Publication Date: 2017-01-11
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
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Problems solved by technology

However, based on the principle of explosive welding, the greater the thickness of the cladding to be welded, the more explosives are needed; and, generally, when the thickness exceeds 20mm, due to excessive explosives, it is easy to cause cracking of the cladding and difficulty in welding
Therefore, it is difficult to obtain a dissimilar metal structure with a cladding thickness greater than 20 mm by conventional explosive welding

Method used

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  • Preparation method of titanium and aluminium dissimilar metal thick plate overlapping structure
  • Preparation method of titanium and aluminium dissimilar metal thick plate overlapping structure

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preparation example Construction

[0024] Such as Figure 1-2 As shown, the present invention provides a kind of preparation method of titanium and aluminum dissimilar metal plate overlapping structure, comprises the following steps:

[0025] (1) Explosive welding is used to connect the titanium alloy substrate 1 and the thin aluminum alloy cladding plate 2 to obtain a composite plate, and the thickness of the thin aluminum alloy cladding plate is 1.5-3mm;

[0026] (2) Friction stir welding is used to connect the composite plate obtained in the step (1) and the thick aluminum alloy cladding plate 3 to obtain a lap joint structure of titanium and aluminum dissimilar metal plates; number 4 is a stirring head.

[0027] The thick aluminum alloy plate is in contact with the thin aluminum alloy cladding layer in the composite plate.

[0028] The invention adopts friction stir welding to connect the clad plate obtained in the step (1) and the thick aluminum alloy plate to obtain a step-by-step connection method of th...

Embodiment 1

[0051] 1. Pretreatment before explosive welding: Grinding the TC4 titanium alloy substrate with a thickness of 20mm and the 2A12 thin aluminum alloy cladding with a thickness of 2mm by grinding with a wire brush to remove the titanium alloy substrate and aluminum Oxide film on the surface of the alloy cladding plate; then use sandpaper to polish the surface after grinding to make the surface clean and smooth, and ensure that the surface roughness is Ra1.25-2.5μm; then clean the surface with absolute ethanol to ensure that the surface is clean.

[0052] 2. Explosive welding: place the processed titanium alloy substrate on a soft and flat sandy soil foundation, and place the processed thin aluminum alloy cladding plate on top of the titanium alloy with the surface to be welded facing up; the prefabricated explosive frame Put it on the aluminum alloy in parallel; install and fix the discharge detonator at the corner of the explosive frame; use the electric detonator detonator to d...

Embodiment 2

[0058] 1. Pretreatment before explosive welding: use wire brush to grind the TC4 titanium alloy substrate side with a thickness of 30mm and the 2A12 thin aluminum alloy cladding plate side with a thickness of 2mm to fully grind to remove the titanium alloy substrate and aluminum alloy. Oxide film on the surface of the alloy cladding plate; then use sandpaper to polish the surface after grinding to make the surface clean and smooth, and ensure that the surface roughness is Ra1.25-2.5μm; then clean the surface with absolute ethanol to ensure that the surface is clean.

[0059] 2. Explosive welding: place the processed titanium alloy substrate on a soft and flat sandy soil foundation, and place the processed thin aluminum alloy cladding plate on top of the titanium alloy with the surface to be welded facing up; the prefabricated explosive frame Put it on the aluminum alloy in parallel; install and fix the discharge detonator at the corner of the explosive frame; use the electric d...

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Abstract

The invention provides a preparation method of a titanium and aluminium dissimilar metal thick plate overlapping structure. The preparation method comprises the steps of firstly, connecting a titanium alloy substrate with a thin aluminium alloy cover plate through adopting explosive welding to obtain a composite board, wherein the thin aluminium alloy cover plate is 1.5 to 3 mm in thickness; and then, connecting the obtained composite board with a thick aluminium alloy plate through adopting friction stir welding to obtain the titanium and aluminium dissimilar metal thick plate overlapping structure, wherein the thick aluminium alloy plate is connected with the thin aluminium alloy cover plate layer in the composite board. According to the preparation method provided by the invention, through a step-by-step connecting method, the problem that the cover plate cracks and is difficult to weld due to the fact that much explosive is utilized during direct explosive welding of titanium and aluminium thick plates is avoided, besides, the problem that a stirring needle is abraded due to the fact that the stirring needle is in direct contact with the titanium alloy substrate during direct friction stir welding of the titanium and aluminium thick plates is avoided, respective advantages of explosive welding and friction stir welding are fully utilized, and a titanium alloy and aluminium alloy dissimilar metal thick plate structure is successfully prepared. The invention further provides the titanium and aluminium dissimilar metal overlapping structure prepared through the technical scheme.

Description

technical field [0001] The invention belongs to the technical field of dissimilar metal welding, and in particular relates to a method for preparing a lap joint structure of titanium and aluminum dissimilar metal thick plates. Background technique [0002] Dissimilar metal welded joints have the properties of the two metals, achieving the effect of complementary advantages between dissimilar metals, enhancing strengths and avoiding weaknesses, and are widely used. For example, in the field of the automobile industry, when the weight of the car is reduced by 25%, the fuel consumption can be saved by 50%. The use of aluminum / steel bimetallic joints can greatly reduce the structure itself on the premise of ensuring the bearing capacity of the joints. Weight, which lays the foundation for reducing the weight of the vehicle body and reducing fuel consumption; in the field of aviation industry, "reducing weight and increasing the thrust-to-weight ratio" has become an important des...

Claims

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Application Information

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IPC IPC(8): B23K28/02B23K20/12B23K20/233B23K20/08B23K101/18B23K103/18
CPCB23K28/02B23K20/08B23K20/122B23K20/2333B23K20/2336B23K2101/18B23K2103/18
Inventor 陈玉华曹文明谢吉林
Owner NANCHANG HANGKONG UNIVERSITY
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