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Powder medium diffusion reaction resistance brazing method of magnesium alloy

A diffusion reaction and resistance brazing technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of high thermal conductivity of magnesium alloys, difficult welding process, large coefficient of linear expansion, etc., to improve metallurgical behavior, formula Flexible, low-cost effects

Inactive Publication Date: 2010-11-17
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] (2) Magnesium alloy has high thermal conductivity and large linear expansion coefficient, which brings certain difficulties to the welding process
To sum up, there is no report on the welding technology with the above characteristics at home and abroad.

Method used

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  • Powder medium diffusion reaction resistance brazing method of magnesium alloy
  • Powder medium diffusion reaction resistance brazing method of magnesium alloy
  • Powder medium diffusion reaction resistance brazing method of magnesium alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Embodiment 1: The clamping and welding process of the materials to be welded are as follows figure 1 , image 3 As shown, it is a single pulse current welding process. The AZ31B magnesium alloy workpiece 1 is the overlapping joint of two flat plates with a thickness of 1 mm. After the magnesium-based powder medium is uniformly mixed with acetone, the pressure sprayer is evenly sprayed on the surface of the magnesium alloy workpiece 1 to be welded to form a powder medium filling layer 2 . Set the main welding parameters as: welding current I=12000A, electrode pressure F=1570N, welding current duration t 2= 1.5s. 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 6 at the welding area, turn on the argon gas protection, and the gas flow rate is 4L / min. Apply electrode pressure F to make the workpieces to be welded t...

Embodiment 2

[0041] Embodiment 2: The clamping of materials to be welded and the welding process are as follows figure 1 , Figure 4 As shown, it is a double pulse current welding process. and image 3 Compared with the process flow shown, Figure 4 The process flow increases the auxiliary welding current I 2 , keep the filling layer of the welded joint at a higher temperature for a certain period of time to facilitate the diffusion of dissimilar metals. The AZ31B magnesium alloy workpiece 1 is the overlapping joint of two flat plates with a thickness of 1 mm. After the magnesium-based powder medium is uniformly mixed with acetone, it is uniformly sprayed on the surface of the workpiece 1 to be welded by a pressure sprayer to form a filling layer 2 . Set the main welding parameters as: main welding current I 1 =12000A, auxiliary welding current I 2 =8000A, electrode pressure F=1570N, main welding current duration t 2 = 1.5s, the auxiliary welding current duration t3 = 1.5s. After ...

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Abstract

The invention discloses a powder medium diffusion reaction resistance brazing method of magnesium and a magnesium alloy material, applying in welding of the magnesium and the magnesium alloy material. In the method, a magnesium base powder medium is used as a filling layer, thus improving the problem that contact resistance of the magnesium alloy material is difficult to be welded at the initial stage of the welding; and resistance heat is used as a welding heat source, under the protection of a protective gas and the action of the resistance heat, the partial melting of the surface to be welded of the material and the rapid melting of the powder medium are synchronized to form an alloy solder. Under the impact action of an electrode voltage with a proper magnitude, an oxide film smashes, the powder medium generates an eutectic reaction on the interface of the material to be welded and an eutectic is formed on the interface by virtue of a diffusion action among dissimilar metals, thereby realizing the reliable connection of the materials. The method is mainly used for achieving the welding under the environment of inert gas protection and has strong flexibility and relative ideal project meaning.

Description

technical field [0001] The invention relates to a powder medium diffusion reaction resistance brazing method for magnesium alloys, which is suitable for welding magnesium and magnesium alloy plates and wires, especially difficult-to-weld magnesium alloy materials. Background technique [0002] Due to the physical and chemical properties of magnesium and magnesium alloys, a series of problems are prone to occur during the welding process, mainly as follows: [0003] (1) Magnesium alloy has a strong oxidation effect during welding, and it is easy to form a magnesium oxide film on the surface. This high melting point magnesium oxide film seriously affects or hinders the formation of the weld. At the same time, magnesium oxide or magnesium nitride slag will also be formed during the welding process, resulting in a decrease in the plasticity of the weld metal. Therefore, protection needs to be strengthened during welding to prevent and reduce the formation of magnesium oxides and...

Claims

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Application Information

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IPC IPC(8): B23K1/00
Inventor 罗怡许惠斌叶宏李晖李春天伍光凤
Owner CHONGQING UNIV OF TECH
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