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Point welding technique of magnesium alloy filled with reactive powder

A technology of active powder and process method, applied in metal processing equipment, manufacturing tools, welding equipment and other directions, can solve the problems of high equipment and maintenance and operating costs, coarse magnesium alloy grains, and high energy consumption, and achieve ideal engineering practicality. Significance, improved weldability, the effect of flexible formulation

Inactive Publication Date: 2013-06-26
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, TIG, laser beam, electron beam, and friction stir spot welding are researched on magnesium alloy spot welding. The above spot welding methods consume a lot of energy, have low production efficiency, and high equipment, maintenance and operation costs.
Therefore, resistance spot welding of magnesium alloy is an excellent choice, but resistance spot welding of magnesium alloy requires a high welding current (greater than 15KA), so many researchers now add steel between the electrode and magnesium alloy for small current conditions. Welding, but the grains of the welded magnesium alloy are relatively coarse, so it is urgent to develop a method that can obtain fine grains under low current conditions
[0004] After searching the literature of the existing technology, it was found that Lang Bo (Jilin University doctoral dissertation, 2008) welded with a current between 15-23KA, the joint grains were larger, and the energy consumption was larger; Ren Xinlei et al. (Light Alloy Processing Technology, 7 , 2011) used the method of thermal compensation to achieve low current welding of magnesium alloys, but the joint grains are still large, so it is urgent to develop a method that can obtain fine grains under low current conditions

Method used

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  • Point welding technique of magnesium alloy filled with reactive powder

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0029] Embodiment 1: The clamping of the materials to be welded is as follows figure 1 As shown, it is a single pulse current welding process. Thermal compensation block 2 is No. 45 steel with a thickness of 1mm. The AZ31 magnesium alloy workpiece 3 is the overlapping joint of two flat plates with a thickness of 0.8mm. Mix 38 parts of active powder 50-mesh titanium dioxide, 42 parts of 50-mesh silicon dioxide, and the rest 50-mesh calcium fluoride medium with alcohol, and then evenly spray it on the surface of the magnesium alloy workpiece 3 to be welded by a pressure sprayer to form a powder Dielectric fill layer 4. The main welding parameters are set as follows: welding current I = 4000A, electrode pressure = 1860N, welding current duration t2 = 1.3s. After the acetone in the powder filling layer is volatilized, the flat plate workpieces to be welded are overlapped and clamped between the upper and lower electrodes 3 and 4 . Aim the protective gas nozzle at the welding ...

Embodiment approach 2

[0030] Embodiment 2: The clamping of the materials to be welded is as follows figure 1 As shown, it is a single pulse current welding process. Thermal compensation block 2 is No. 45 steel with a thickness of 1mm. AZ31 magnesium alloy workpiece 3 is the overlap of two flat plates with a thickness of 0.4mm. Mix 38 parts of active powder 100 mesh titanium dioxide, 42 parts of 50 mesh silicon dioxide, and the remaining 150 mesh calcium fluoride medium with alcohol, and then evenly spray it on the surface of the magnesium alloy workpiece 3 to be welded by a pressure sprayer to form a powder Dielectric fill layer 4. The main welding parameters are set as follows: welding current I = 5000A, electrode pressure = 1560N, welding current duration t2 = 1.3s. After the acetone in the powder filling layer is volatilized, the flat workpieces to be welded are lapped and clamped between the upper and lower electrodes. Aim the protective gas nozzle at the welding area, turn on the argon gas...

Embodiment approach 3

[0031] Embodiment 3: The clamping of the materials to be welded is as follows figure 1 As shown, it is a single pulse current welding process. The thermal compensation block is 45 steel with a thickness of 1mm. AZ31 magnesium alloy workpiece 3 is the overlap of two flat plates with a thickness of 1mm. Mix 38 parts of active powder 50-mesh titanium dioxide, 42 parts of 100-mesh silicon dioxide, and the rest 50-mesh calcium fluoride medium with alcohol, and then evenly spray it on the surface of the magnesium alloy workpiece 3 to be welded by a pressure sprayer to form a powder Dielectric fill layer 4. The main welding parameters are set as follows: welding current I = 5500A, electrode pressure = 1960N, welding current duration t2 = 2s. After the acetone in the powder filling layer is volatilized, the flat workpieces to be welded are lapped and clamped between the upper and lower electrodes. Aim the protective gas nozzle at the welding area, turn on the argon gas protection...

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Abstract

The invention relates to a point welding technique of magnesium alloy filled with reactive powder, and belongs to the welding field of magnesium and the magnesium alloy material. The point welding technique of the magnesium alloy filled with the reactive powder is characterized in that the reactive powder is used as a filled layer to improve the contact resistance of magnesium alloy material which is difficult to weld in an early welding period. Resistance heat serves as a welding heat source, under the actions of protection of protective gas and resistance heat of added thermal compensation blocks, partial melting of surfaces to be welded of material happens simultaneously. Under the action of appropriate electrode pressure impact, oxidation films are crushed, refining action of the reactive powder medium is promoted on the interface of the material to be welded, nuggets are formed on the interface, so that the effect that nugget grains are refined under a relatively small current is achieved. Welding is achieved under thermal compensation, flexibility is relatively strong, and the point welding technology of the magnesium alloy filled with the reactive powder is of relatively ideal project significance.

Description

technical field [0001] The invention discloses a magnesium alloy filling active powder spot welding process, which belongs to the field of magnesium alloy welding, and in particular relates to a technical scheme of a magnesium alloy filling active powder spot welding process. [0002] Background technique [0003] As a green engineering material, magnesium alloy has been valued by the industry. Spot welding is one of the key factors for the application of magnesium alloys in modern vehicles. At present, TIG, laser beam, electron beam, and friction stir spot welding are researched on magnesium alloy spot welding. The above spot welding methods consume a lot of energy, have low production efficiency, and have high equipment, maintenance and operation costs. Therefore, resistance spot welding of magnesium alloy is an excellent choice, but resistance spot welding of magnesium alloy requires a high welding current (greater than 15KA), so many researchers now add steel between t...

Claims

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Application Information

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IPC IPC(8): B23K1/19B23K1/20
Inventor 丁敏刘士森何宏伟胡连海
Owner TAIYUAN UNIV OF TECH
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