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NiTi shape memory alloy adding Al intermediate layer ultrasonic welding method

A technology of ultrasonic welding and memory alloy, which is applied in the field of material processing to achieve the effects of improving mechanical properties, saving costs and reducing pollution

Inactive Publication Date: 2020-12-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, there is very little research on ultrasonic welding of NiTi shape memory alloys, which is still in its infancy, and the thickness and hardness of NiTi shape memory alloy sheets have a great influence on the quality of ultrasonic welded joints, so there is an urgent need for a NiTi shape memory alloy plus Al intermediate. Layer ultrasonic welding method to meet the mechanical performance requirements and functional characteristics of the joints

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  • NiTi shape memory alloy adding Al intermediate layer ultrasonic welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0037] 1. The NiTi shape memory alloy sheet is processed into a welded specimen of 70mm×15mm by wire cutting method.

[0038] 2. Start the SONICS-MW20 ultrasonic welding equipment, and transmit the vibration energy of the ultrasonic welding equipment to the welding head. Under the joint action of the static pressure of the welding head and mechanical vibration, high-speed frictional heat generation and plasticity will occur between the NiTi shape memory alloy and the aluminum foil interface. Deformation and other behaviors break the NiTi oxide film to achieve the combination of metal atoms and complete the welding. The frequency of the ultrasonic wave is 20kHz; the energy of the ultrasonic welding equipment is 500J; the welding amplitude is 55μm; the clamping pressure is 0.38Mpa, the power is 2000w, and the time is 1s.

[0039] 3. Observing the surface morphology of the weld with a super depth-of-field three-dimensional microscope (VHX-2000C), and using a tungsten filament sca...

Embodiment example 2

[0042] 1. The NiTi shape memory alloy sheet is processed into a welded specimen of 70mm×15mm by wire cutting method.

[0043] 2. Start the SONICS-MW20 ultrasonic welding equipment, and transmit the vibration energy of the ultrasonic welding equipment to the welding head. Under the joint action of the static pressure of the welding head and mechanical vibration, high-speed frictional heat generation and plasticity will occur between the NiTi shape memory alloy and the aluminum foil interface. Deformation and other behaviors break the NiTi oxide film to achieve the combination of metal atoms and complete the welding. The frequency of the ultrasonic wave is 20kHz; the energy of the ultrasonic welding equipment is 1500J; the welding amplitude is 60μm; the clamping pressure is 0.35MPa, the power is 1000w, and the time is 1.2s.

[0044] 3. Observing the surface morphology of the weld with a super depth-of-field three-dimensional microscope (VHX-2000C), and using a tungsten filament ...

Embodiment example 3

[0046] 1. The NiTi shape memory alloy sheet is processed into a welded specimen of 70mm×15mm by wire cutting method.

[0047] 2. Start the SONICS-MW20 ultrasonic welding equipment, and transmit the vibration energy of the ultrasonic welding equipment to the welding head. Under the joint action of the static pressure of the welding head and mechanical vibration, high-speed frictional heat generation and plasticity will occur between the NiTi shape memory alloy and the aluminum foil interface. Deformation and other behaviors break the NiTi oxide film to achieve the combination of metal atoms and complete the welding. The frequency of the ultrasonic wave is 20kHz; the energy of the ultrasonic welding equipment is 2500J; the welding amplitude is 40μm; the clamping pressure is 0.32Mpa, the power is 2500w, and the time is 0.6s.

[0048] 3. Observing the surface morphology of the weld with a super depth-of-field three-dimensional microscope (VHX-2000C), and using a tungsten filament ...

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Abstract

The invention discloses an NiTi shape memory alloy adding Al intermediate layer ultrasonic welding method. An NiTi shape memory alloy is overlapped, an aluminum foil is taken as an intermediate layer,vibration energy of ultrasonic welding equipment is transferred to a welding head, under the combined action of static pressure and mechanical vibration of the welding head, interfaces of the NiTi shape memory alloy and the aluminum foil are subjected to high-speed friction heat generation, plastic deformation and other behaviors, a NiTi oxide film is broken, metal atom combination is achieved, and thus welding is completed. According to the technical scheme, the problems that harmful intermetallic compounds are formed and joint phase components are obviously changed in a traditional fusion welding method are solved, the aluminum foil is taken as the intermediate layer, the mechanical property of an NiTi ultrasonic welding joint is improved, and obvious improvement is achieved in remaining the functional characteristics of the NiTi shape memory alloy.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to an ultrasonic welding method of a NiTi shape memory alloy plus an Al intermediate layer. Background technique [0002] NiTi shape memory alloy is a general term for nearly equiatomic ratio Ni-Ti alloys, which have two very different functional properties: shape memory effect and superelasticity. This is due to its reversible martensitic phase transformation. The phase transition temperature of NiTi shape memory alloy is generally between -150 and 200 °C. The high-temperature phase in the martensitic transformation is called the parent phase, or the austenite phase (P), which is a CsCl phase (also known as B2) with a body-centered cubic crystal structure. The low-temperature phase is called the martensite phase ((B19'), which is a low-symmetry monoclinic crystal structure. The phase transition from the parent phase to the martensite phase is called a positive marte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/10B23K20/16
CPCB23K20/10B23K20/16
Inventor 敖三三李春节何思贤王安琪秦向阳吴满鹏罗震
Owner TIANJIN UNIV