Method for low temperature brazing aluminium alloy to obtain brazed joint with high temperature use performance

A technology for welding joints and aluminum alloys, which is used in welding/welding/cutting items, welding media, welding equipment, etc., and can solve the problems of long welding cycle, difficulty in welding complex structural parts, and corrosion of workpieces.

Active Publication Date: 2009-07-29
哈尔滨工大光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem that the existing TIG welding, MIG welding, laser welding, electron beam welding, diffusion welding and instantaneous liquid phase welding methods have large deformation after welding, and it is difficult to realize welding of complex structural parts, and there is residual flux after welding in the brazing method. There are problems of corrosion to the workpiece, high operating cost, long welding cycle, low strength of soldered brazed joints, and poor high-temperature serviceability of welded joints. A method for low-temperature brazing aluminum alloys to obtain high-temperature serviceable welded joints is proposed

Method used

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specific Embodiment approach 1

[0004] Specific Embodiment 1: In this embodiment, the method for brazing aluminum alloys at low temperature to obtain high-temperature serviceable welded joints is realized through the following steps: 1. The brazing filler metal is made into thin slices of 50-500 μm or rods or wires with a diameter of 1000-5000 μm Put it into the weld gap of two parts to be welded or the gap port; 2. Under the conditions of ultrasonic frequency of 20-100kHz, amplitude of 1-50μm, and brazing temperature of 190-450℃, perform ultrasonic brazing on the brazing part Weld for 0.1-60s, complete the preliminary brazing and form a welded joint at the welding place; 3. Adjust the temperature of the welded joint to 190-550°C and keep it for 1-60 minutes, and then use ultrasonic frequency of 20-100kHz and amplitude of Ultrasonic vibration is carried out on the welded joint under the condition of 1-50 μm, that is, the method of realizing low-temperature brazing aluminum alloy to obtain high-temperature per...

specific Embodiment approach 2

[0006] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, the solder for brazing aluminum alloy at low temperature is a Sn-Zn alloy, Zn-Al with a mass percentage of Zn of 50% to 99.99%. One of alloy or pure zinc. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0007] Specific embodiment three: the difference between this embodiment and specific embodiment one is that in step one, the brazing material is made into a thin sheet of 100-400 μm or a rod or wire with a diameter of 2000-4000 μm is put into the welding of two parts to be welded. slot gap or gap port. Other steps are the same as in the first embodiment.

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Abstract

The invention relates to a method for brazing an aluminum alloy at a low temperature to obtain a welded joint with high-temperature performance, and the invention relates to a welding method. It is to solve the large deformation after welding in the existing method, and it is difficult to realize the welding of complex structural parts. In the brazing method, the residual flux after welding has a corrosive effect on the workpiece, high operating cost, long welding cycle and the strength of the soldering joint. Low, poor performance of welded joints at high temperatures. The method for obtaining welded joints with high-temperature serviceability by low-temperature brazing of aluminum alloys is realized through the following steps: 1. Putting brazing filler metal into the weld gap or the gap port; 2. Preliminary brazing; 3. Ultrasonic treatment. When the aluminum alloy is brazed by the method of the invention, there is no corrosion effect on the workpiece, and the method of the invention has short welding cycle, low welding temperature and low operation cost. The method of the invention improves the strength of the welded joint, and improves the performance of welding at high temperature.

Description

technical field [0001] The invention relates to a welding method. Background technique [0002] Aluminum alloy has the characteristics of low density, high strength and corrosion resistance, so it is widely used in automobiles, high-speed railway vehicles, and aerospace industries. In particular, the price of copper metal materials is soaring. Many traditional copper alloy structural parts have been replaced by aluminum alloys, which makes the application range of aluminum alloys wider than before. As a result, more and more attention is paid to the welding technology of aluminum alloys. The requirements are also more stringent. For aluminum alloy structural parts, ensuring a small amount of denaturation is the key point, so people expect that the lower the welding temperature, the better, TIG welding, MIG welding, laser welding, electron beam welding, diffusion welding and instantaneous liquid phase welding methods There are problems of large deformation after welding and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/06B23K35/14B23K35/24B23K35/28B23K103/10
Inventor 闫久春赵维巍马志鹏许志武杨士勤
Owner 哈尔滨工大光电科技有限公司
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