CN111843167A - Method for ultrasonically welding nickel-titanium shape memory alloy thin plate - Google Patents
Method for ultrasonically welding nickel-titanium shape memory alloy thin plate Download PDFInfo
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- CN111843167A CN111843167A CN202010603880.7A CN202010603880A CN111843167A CN 111843167 A CN111843167 A CN 111843167A CN 202010603880 A CN202010603880 A CN 202010603880A CN 111843167 A CN111843167 A CN 111843167A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/16—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating with interposition of special material to facilitate connection of the parts, e.g. material for absorbing or producing gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/24—Preliminary treatment
Abstract
A method for ultrasonically welding nickel-titanium shape memory alloy sheets comprises the steps of coating mixed particles of nano titanium hydride and nickel formate coated nano nickel between the nickel-titanium shape memory alloy sheets to be welded to form an intermediate layer, mechanically mixing the mixed particles according to the molar ratio of the nano titanium hydride to the nickel formate coated nano nickel particles of 1:1, wherein the thickness of the intermediate layer is 20-40 mu m; ultrasonic welding is carried out on the nickel-titanium shape memory alloy thin plate coated with the mixed particle middle layer, the welding time is 0.55-0.9 s, the welding pressure is 45-70 psi, and the welding amplitude is 40-65 mu m; the method can improve the welding rate of the interface of the nickel-titanium shape memory alloy sheet welded by ultrasonic waves, thereby improving the mechanical property of the nickel-titanium shape memory alloy joint welded by ultrasonic waves, and the maximum shear strength of the joint welded by ultrasonic waves can reach 2890N by adopting the mixed particles of nano titanium hydride and nickel formate coated with nano nickel as the intermediate layer to assist the nickel-titanium shape memory alloy to be welded by ultrasonic waves.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a method for ultrasonically welding a nickel-titanium shape memory alloy thin plate.
Background
The nickel-titanium shape memory alloy has the advantages of superelasticity and shape memory effect, and is widely applied to the fields of medical instruments, aerospace, machinery, instruments and the like; at present, the connection method of the nickel-titanium shape memory alloy mainly comprises laser welding, electron beam welding, TIG welding and the like, when the method is adopted for welding, the nickel-titanium shape memory alloy is melted, then crystal grains in a welding seam are coarsened, the texture is greatly changed, a high-temperature heat source can cause the evaporation of nickel elements, and meanwhile, the welding seam has obvious heat influence, so that the stress distribution near the welding seam is not uniform, and the function of the nickel-titanium shape memory alloy is influenced.
The ultrasonic welding technology is used as a solid welding technology, has the advantages of short welding time, low energy consumption, environmental protection, no welding air hole and the like compared with laser welding, electron beam welding and TIG welding, has small heat input amount and no heat influence area, and can be used for welding the nickel-titanium shape memory alloy; however, the nickel-titanium shape memory alloy has higher hardness, and certain difficulty exists in ultrasonic welding of the nickel-titanium shape memory alloy, so that the welding rate of the interface of the ultrasonic welding nickel-titanium shape memory alloy joint is not high, and the performance of the joint is affected; therefore, a method for improving the interface welding rate and the joint mechanical property of the ultrasonic welding nickel-titanium shape memory alloy thin plate is needed.
Disclosure of Invention
In view of the above, in order to solve the above-mentioned deficiencies of the prior art, the present invention aims to provide a method for ultrasonically welding a nickel-titanium shape memory alloy thin plate, which can improve the welding rate of the interface of the ultrasonically welded nickel-titanium shape memory alloy thin plate, thereby improving the mechanical properties of the ultrasonically welded nickel-titanium shape memory alloy joint.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for ultrasonically welding a nickel-titanium shape memory alloy sheet comprises the steps of coating nanoscale mixed particles between nickel-titanium shape memory alloy sheets to be welded to form an intermediate layer, wherein the thickness of the intermediate layer is 20-40 mu m, the mixed particles comprise nano titanium hydride and nano nickel particles with a layer of nickel formate of which the thickness is 2 nm coated on the surface of the mixed particles; and carrying out ultrasonic welding on the nickel-titanium shape memory alloy sheet coated with the mixed particle middle layer, wherein the welding time is 0.55-0.9 s, the welding pressure is 45-70 psi, and the welding amplitude is 40-65 mu m.
Furthermore, the thickness of the nickel-titanium shape memory alloy thin plate is 0.5-2 mm.
Further, the mixed particles are mechanically mixed in a molar ratio of 1:1 of the nano-titanium hydride to the nickel formate coated nano-nickel particles.
Furthermore, the particle size of the nano titanium hydride particles is 10-100 nm, and the particle size of the nano nickel particles is 10-50 nm.
Further, before the mixed particle middle layer is coated, the nickel-titanium shape memory alloy sheet is immersed into a dilute hydrochloric acid solution with the concentration of 6-8% and a hydrofluoric acid solution with the concentration of 3-7% for cleaning for 8-25 minutes, and then is cleaned by acetone and dried.
Further, the mixed particles are coated on the surface of the thin nickel titanium shape memory alloy plate to be welded by means of printing.
Furthermore, the connection mode between the nickel-titanium shape memory alloy thin plates is lap joint, and the lap joint is connection between two layers of nickel-titanium shape memory alloy thin plates or between multiple layers of nickel-titanium shape memory alloy thin plates; when two or more thin nickel-titanium shape memory alloy sheets are lapped, the mixed particles are added between the two or adjacent thin nickel-titanium shape memory alloy sheets.
The invention has the beneficial effects that:
the nickel-titanium shape memory alloy sheet added with the nano-titanium hydride and nickel formate coated nano-nickel mixed particle intermediate layer is welded by ultrasonic waves, the nano-titanium hydride and nickel formate coated nano-nickel mixed particle intermediate layer at a welding interface is subjected to a certain pressure and high-frequency shearing force during ultrasonic welding, the temperature of the intermediate layer is increased, firstly, when the temperature reaches the decomposition temperature of nickel formate, nickel formate is decomposed into nano-nickel particles, carbon dioxide and hydrogen, when the temperature reaches the decomposition temperature of the nano-titanium hydride particles, the nano-titanium hydride particles are decomposed into nano-titanium particles and hydrogen, and in the process, the hydrogen generated by the decomposition of the nano-titanium hydride particles and the nickel formate can eliminate oxides of the welding interface;
Then, when the temperature of the welding interface reaches the temperature at which the nano titanium particles and the nano nickel particles generate chemical reaction, the nano titanium and the nano nickel of the welding interface rapidly react, the reaction is an exothermic reaction, a large amount of heat is generated, the temperature of the welding interface is increased, the welding rate of the welding interface can be increased, and the mechanical property of a welding joint is improved;
in summary, the invention adopts the mixed particles of nano titanium hydride and nickel formate coated nano nickel as the intermediate layer to assist the ultrasonic welding of the maximum shear strength of the joint of the nickel-titanium shape memory alloy to reach 2890N, and the method solves the problem of low mechanical property of the ultrasonic welding of the joint of the nickel-titanium shape memory alloy and can meet the requirements of the ultrasonic welding of the joint of the nickel-titanium shape memory alloy in the fields of medical instruments, aerospace, machinery, instrument and the like.
Detailed Description
The following specific examples are given to further clarify, complete and detailed the technical solution of the present invention. The present embodiment is a preferred embodiment based on the technical solution of the present invention, but the scope of the present invention is not limited to the following embodiments.
Example 1
A method for ultrasonic welding nickel titanium shape memory alloy sheet, take two nickel titanium shape memory alloy sheet of thickness 0.5mm to be welded, before carrying on ultrasonic welding, soak in dilute hydrochloric acid of concentration 6% and hydrofluoric acid solution of concentration 3.5% to wash for 9 minutes, then wash with acetone, dry;
coating nano-scale mixed particles between two layers of nickel-titanium shape memory alloy sheets to form an intermediate layer, wherein the mixed particles comprise nano-titanium hydride and nano-nickel particles coated with a layer of nickel formate with the thickness of 2 nm on the surface; the mixed particles are coated on the surface of the nickel-titanium shape memory alloy sheet to be welded in a printing mode; the mixed particles are mechanically mixed according to the molar ratio of nano titanium hydride to nickel formate coated nano nickel particles of 1:1, the particle size of the nano titanium hydride particles is 15nm, the particle size of the nano nickel particles is 18nm, and the thickness of the middle layer is 25 mu m;
Carrying out ultrasonic welding on the nickel-titanium shape memory alloy thin plates coated with the mixed particle middle layers, wherein the connection mode of the nickel-titanium shape memory alloy thin plates is lap joint, the welding time is 0.55s, the welding pressure is 45psi, and the welding amplitude is 40 micrometers; firstly, when the temperature reaches the decomposition temperature of the nickel formate, the nickel formate is decomposed into nano nickel particles, carbon dioxide and hydrogen, when the temperature reaches the decomposition temperature of the nano titanium hydride particles, the nano titanium hydride particles are decomposed into nano titanium particles and hydrogen, and in the processes, the hydrogen generated by the decomposition of the nano titanium hydride particles and the nickel formate can eliminate oxides of the welding interface; when the temperature of the welding interface reaches the temperature at which the nano titanium particles and the nano nickel particles generate chemical reaction, the nano titanium and the nano nickel of the welding interface rapidly react, the reaction is an exothermic reaction, a large amount of heat is generated, the temperature of the welding interface is increased, the welding rate of the welding interface can be increased, and the mechanical property of a welding joint is improved;
The performance parameters of the ultrasonic welding nickel-titanium shape memory alloy joint in the embodiment 1 of the invention are as follows: the shearing force is 523.6N, which is 53.4 percent higher than that of the ultrasonic welding nickel-titanium shape memory alloy joint without the nano-titanium hydride and nickel formate coated nano-nickel mixed particle intermediate layer.
Example 2
A method for ultrasonic welding of nickel-titanium shape memory alloy thin plates comprises the steps of taking two nickel-titanium shape memory alloy thin plates to be welded with the thickness of 1mm, immersing the two nickel-titanium shape memory alloy thin plates into a dilute hydrochloric acid solution with the concentration of 6.5% and a hydrofluoric acid solution with the concentration of 4% for cleaning for 15 minutes before ultrasonic welding, cleaning with acetone, and airing;
coating nano-scale mixed particles between two layers of nickel-titanium shape memory alloy sheets to form an intermediate layer, wherein the mixed particles comprise nano-titanium hydride and nano-nickel particles coated with a layer of nickel formate with the thickness of 2 nm on the surface; the mixed particles are coated on the surface of the nickel-titanium shape memory alloy sheet to be welded in a printing mode; the mixed particles are mechanically mixed according to the molar ratio of nano titanium hydride to nickel formate coated nano nickel particles of 1:1, the particle size of the nano titanium hydride particles is 50nm, the particle size of the nano nickel particles is 25nm, and the thickness of the middle layer is 30 microns;
Carrying out ultrasonic welding on the nickel-titanium shape memory alloy thin plates coated with the mixed particle middle layers, wherein the connection mode of the nickel-titanium shape memory alloy thin plates is lap joint, the welding time is 0.7s, the welding pressure is 60psi, and the welding amplitude is 55 micrometers; firstly, when the temperature reaches the decomposition temperature of the nickel formate, the nickel formate is decomposed into nano nickel particles, carbon dioxide and hydrogen, when the temperature reaches the decomposition temperature of the nano titanium hydride particles, the nano titanium hydride particles are decomposed into nano titanium particles and hydrogen, and in the processes, the hydrogen generated by the decomposition of the nano titanium hydride particles and the nickel formate can eliminate oxides of the welding interface; when the temperature of the welding interface reaches the temperature at which the nano titanium particles and the nano nickel particles generate chemical reaction, the nano titanium and the nano nickel of the welding interface rapidly react, the reaction is an exothermic reaction, a large amount of heat is generated, the temperature of the welding interface is increased, the welding rate of the welding interface can be increased, and the mechanical property of a welding joint is improved;
The performance parameters of the ultrasonic welding nickel-titanium shape memory alloy joint in the embodiment 2 of the invention are as follows: the shearing force is 1945.7N, which is improved by 58.9 percent compared with the shearing force of the ultrasonic welding nickel-titanium shape memory alloy joint without the nano titanium hydride and nickel formate coated nano nickel mixed particle intermediate layer.
Example 3
A method for ultrasonic welding of nickel-titanium shape memory alloy thin plates comprises the steps of taking two nickel-titanium shape memory alloy thin plates to be welded with the thickness of 2mm, immersing the two nickel-titanium shape memory alloy thin plates into a dilute hydrochloric acid solution with the concentration of 7.5% and a hydrofluoric acid solution with the concentration of 5% for cleaning for 11 minutes before ultrasonic welding, cleaning with acetone, and airing;
coating nano-scale mixed particles between two layers of nickel-titanium shape memory alloy sheets to form an intermediate layer, wherein the mixed particles comprise nano-titanium hydride and nano-nickel particles coated with a layer of nickel formate with the thickness of 2 nm on the surface; the mixed particles are coated on the surface of the nickel-titanium shape memory alloy sheet to be welded in a printing mode; the mixed particles are mechanically mixed according to the molar ratio of nano titanium hydride to nickel formate coated nano nickel particles of 1:1, the particle size of the nano titanium hydride particles is 100nm, the particle size of the nano nickel particles is 50nm, and the thickness of the middle layer is 40 mu m;
Carrying out ultrasonic welding on the nickel-titanium shape memory alloy thin plates coated with the mixed particle middle layers, wherein the connection mode of the nickel-titanium shape memory alloy thin plates is lap joint, the welding time is 0.9s, the welding pressure is 70psi, and the welding amplitude is 65 micrometers; firstly, when the temperature reaches the decomposition temperature of the nickel formate, the nickel formate is decomposed into nano nickel particles, carbon dioxide and hydrogen, when the temperature reaches the decomposition temperature of the nano titanium hydride particles, the nano titanium hydride particles are decomposed into nano titanium particles and hydrogen, and in the processes, the hydrogen generated by the decomposition of the nano titanium hydride particles and the nickel formate can eliminate oxides of the welding interface; when the temperature of the welding interface reaches the temperature at which the nano titanium particles and the nano nickel particles generate chemical reaction, the nano titanium and the nano nickel of the welding interface rapidly react, the reaction is an exothermic reaction, a large amount of heat is generated, the temperature of the welding interface is increased, the welding rate of the welding interface can be increased, and the mechanical property of a welding joint is improved;
The performance parameters of the ultrasonic welding nickel-titanium shape memory alloy joint in the embodiment 3 of the invention are as follows: the shearing force is 2776.8N, which is increased by 65.8% compared with the shearing force of the ultrasonic welding nickel-titanium shape memory alloy joint without the nano titanium hydride and nickel formate coated nano nickel mixed particle intermediate layer.
The principal features, principles and advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to explain the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as expressed in the following claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The method for ultrasonically welding the nickel-titanium shape memory alloy thin plate is characterized in that nanoscale mixed particles are coated between the nickel-titanium shape memory alloy thin plates to be welded to form an intermediate layer, the thickness of the intermediate layer is 20-40 mu m, wherein the mixed particles comprise nano titanium hydride and nano nickel particles coated with a layer of nickel formate with the thickness of 2 nm on the surface; and carrying out ultrasonic welding on the nickel-titanium shape memory alloy sheet coated with the mixed particle middle layer, wherein the welding time is 0.55-0.9 s, the welding pressure is 45-70 psi, and the welding amplitude is 40-65 mu m.
2. The method of claim 1, wherein the thickness of the thin nickel titanium shape memory alloy sheet is 0.5-2 mm.
3. The method of claim 1, wherein the mixing particles are mechanically mixed in a molar ratio of nano-titanium hydride to nickel formate coated nano-nickel particles of 1: 1.
4. The method of claim 1, wherein the nano-titanium hydride particles have a particle size of 10 to 100nm, and the nano-nickel particles have a particle size of 10 to 50 nm.
5. The method of claim 1, wherein the ni-ti shape memory alloy sheet is dipped in a solution of 6-8% diluted hydrochloric acid and 3-7% hydrofluoric acid for 8-25 minutes, washed with acetone, and dried before the intermediate layer of mixed particles is applied.
6. A method of ultrasonically welding a sheet of nitinol shape memory alloy according to claim 1 wherein the mixed particles are applied by printing to the surface of the sheet of nitinol shape memory alloy to be welded.
7. The method of claim 1, wherein the thin nickel titanium shape memory alloy sheets are connected by overlapping, wherein the overlapping is formed by connecting two or more thin nickel titanium shape memory alloy sheets; when two or more thin nickel-titanium shape memory alloy sheets are lapped, the mixed particles are added between the two or adjacent thin nickel-titanium shape memory alloy sheets.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112935508A (en) * | 2021-01-31 | 2021-06-11 | 王书杰 | Large-size titanium alloy bar processing method |
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| JP2004356319A (en) * | 2003-05-28 | 2004-12-16 | Fujikura Ltd | Ultrasonic jointing copper material |
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| CN109759741A (en) * | 2019-03-13 | 2019-05-17 | 重庆理工大学 | A kind of ultrasonic wave added soldering brazing powder and method for welding |
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| CN1337295A (en) * | 2001-08-11 | 2002-02-27 | 无锡威孚吉大新材料应用开发有限公司 | Nano metal solder and its prepn |
| JP2004356319A (en) * | 2003-05-28 | 2004-12-16 | Fujikura Ltd | Ultrasonic jointing copper material |
| CN109365982A (en) * | 2018-11-29 | 2019-02-22 | 华北水利水电大学 | A kind of copper thin material ultrasonic spot welding connection method |
| CN109759741A (en) * | 2019-03-13 | 2019-05-17 | 重庆理工大学 | A kind of ultrasonic wave added soldering brazing powder and method for welding |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112935508A (en) * | 2021-01-31 | 2021-06-11 | 王书杰 | Large-size titanium alloy bar processing method |
| CN112935508B (en) * | 2021-01-31 | 2022-06-10 | 宝鸡瑞熙钛业有限公司 | Large-size titanium alloy bar processing method |
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