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Laser brazing method for TiNi (titanium-nickel) shape memory alloy and dissimilar light metal

A memory alloy and light metal technology, applied in the field of ultrasonic-assisted laser brazing connection, can solve the problems of affecting shape memory performance, low welding temperature, not yet seen, etc., to eliminate the influence and improve the mechanical properties.

Active Publication Date: 2013-08-07
TIANJIN BEIBANG COATING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In general, the microstructure and properties of TiNi shape memory alloys are extremely sensitive to changes in temperature and composition. There are two key problems in the connection with dissimilar metals: 1) The welding temperature close to or exceeding the melting point of TiNi shape memory alloy will seriously affect its shape. memory performance, but the welding temperature is low and it is difficult to obtain a high-strength joint; 2) A certain amount of diffusion at the connection interface between the TiNi shape memory alloy and the dissimilar metal is conducive to improving the strength of the joint, but the interface elements are excessively dispersed and the diffusion layer is too thick. Affecting the shape memory properties of TiNi shape memory alloy base metal and joints
At present, there is no report on the ultrasonic vibration assisted laser brazing technology of TiNi shape memory alloy and titanium alloy.

Method used

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  • Laser brazing method for TiNi (titanium-nickel) shape memory alloy and dissimilar light metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Cut the TiNi shape memory alloy and TC4 titanium alloy into strips of 50mm×10mm×3mm respectively, polish them flat and have a metallic luster on the surface, put them into an alcohol solvent for ultrasonic cleaning for 15 minutes, wipe them and dry them;

[0021] 2. After polishing the Al85Si10Zn2Ag2Ti1 solder with a size of 10mm×3mm×3mm on sandpaper to make it smooth, put it into an alcohol solvent for ultrasonic cleaning for 15 minutes, wipe it and dry it;

[0022] 3. The welding adopts the lap joint method. The TC4 titanium alloy is used as the upper plate, which is lapped on the TiNi shape memory alloy of the lower plate. Turn on the laser, aim the light spot at the solder, and adjust the laser heat input power to 500W. After the solder sags and melts, the laser continues to heat for 4 minutes, and ultrasonic vibration is applied to the edge of the base metal of the lower plate. The ultrasonic time is 1.0s to promote the filling of the solder. After the ultrasoni...

Embodiment 2

[0025] 1. Cut the TiNi shape memory alloy and TC4 titanium alloy into strips of 50mm×10mm×3mm, polish it flat and have a metallic luster on the surface, put it into an alcohol solvent for ultrasonic cleaning for 15 minutes, wipe it and dry it;

[0026] 2. After polishing the Al83Si12Zn2Ag2Ti1 solder with a size of 10mm×3mm×3mm on sandpaper to make it smooth, put it into an alcohol solvent for ultrasonic cleaning for 15 minutes, wipe it and dry it;

[0027] 3. The welding adopts the lap joint method. The TC4 titanium alloy is used as the upper plate, which is lapped on the TiNi shape memory alloy of the lower plate. The solder block is placed on the base material of the lower plate and close to the gap between the upper and lower plates. For quasi-soldering material, adjust the laser heat input power to 500W. After the solder material collapses and melts, the laser continues to heat for 4 minutes, and then apply ultrasonic vibration to the edge of the base metal of the lower pla...

Embodiment 3

[0030] 1. Cut the TiNi shape memory alloy and TC4 titanium alloy into strips of 50mm×10mm×3mm, polish it flat and have a metallic luster on the surface, put it into an alcohol solvent for ultrasonic cleaning for 15 minutes, wipe it and dry it;

[0031] 2. After polishing the Al80Si10Zn6Ag2Ti2 solder with a size of 10mm×3mm×3mm on sandpaper to make it smooth, put it into an alcohol solvent for ultrasonic cleaning for 15 minutes, wipe it and dry it;

[0032] 3. Use TC4 titanium alloy as the upper plate, lap it on the TiNi shape memory alloy of the lower plate, place the solder block on the base material of the lower plate, and close to the gap between the upper and lower plates, turn on the laser, align the light spot with the solder, and adjust the laser The heat input power is 500W. After the solder slumps and melts, the laser continues to heat for 2 minutes, and the ultrasonic vibration is applied to the edge of the base metal of the lower plate. The ultrasonic time is 1.0s to...

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Abstract

The invention discloses a laser brazing method for a TiNi shape memory alloy and a dissimilar light metal, and belongs to the technical field of dissimilar material connection. To-be-brazed surfaces of the TiNi shape memory alloy and the dissimilar light metal are cleaned and dried after polished and leveled; a lap joint manner is adopted in welding, the dissimilar light metal is taken as an upper plate and is in lap joint onto the TiNi shape memory alloy which is a lower plate, and a brazing filler metal is placed on the TiNi shape memory alloy which is the lower plate and is closely attached to a lap joint end of the dissimilar light metal; the brazing filler metal is heated by lasers, and ultrasonic vibration is loaded on an edge of the TiNi shape memory alloy which is the lower plate after the brazing filler metal comes down and is melted, so that welding seams are filled with the brazing filler metal; and finally a product is taken out after air cooling. According to the method, the brazing joint which is high in strength and has no defects can be obtained.

Description

technical field [0001] The invention belongs to the technical field of connection of dissimilar materials, and in particular relates to an ultrasonic-assisted laser brazing method for connecting TiNi shape memory alloys and dissimilar light metals. Background technique [0002] The research and application of new materials has become an important part of modern high technology. TiNi shape memory alloy has a high energy density and will not cause a significant increase in weight. At the same time, it has two functions as a temperature sensor and an actuator. Compared with high-alloy steel or aluminum alloy, titanium alloy has low density, high strength, Due to their good heat resistance and corrosion resistance, these two materials are widely used in the aerospace industry, such as deformation drivers for aircraft inlets, aircraft frames, and aeroengine blades. The connection between the shape memory alloy driver and the titanium alloy structure of the aircraft fuselage is m...

Claims

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Application Information

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IPC IPC(8): B23K1/19B23K1/20B23K1/005B23K1/06
Inventor 李红陶博浩聂海杰郭福栗卓新
Owner TIANJIN BEIBANG COATING MATERIAL
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