A friction stir joining method and device based on electroplastic effect

A technology of friction stir and electroplasticity, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of limited auxiliary effect, insufficient heat input, easy failure of stirring tools, etc., and achieves easy implementation and simple loading method , Improve the effect of Joule heating effect

Active Publication Date: 2021-04-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of insufficient heat input and easy failure of stirring tools in the existing high-melting point metal friction stir connection, as well as the limited auxiliary effect in the existing electric-assisted friction stir connection. Based on the advantages of technology and electroplastic effect, a method of friction stir joining based on electroplastic effect is invented, and a corresponding device is provided at the same time

Method used

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  • A friction stir joining method and device based on electroplastic effect
  • A friction stir joining method and device based on electroplastic effect
  • A friction stir joining method and device based on electroplastic effect

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Experimental program
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Embodiment 1

[0030]Such asfigure 1 ,figure 2 withimage 3Indicated.

[0031]A mixing frictional connection method based on electrical plastic effect, the specific steps are as follows:

[0032]1) Before stirring friction, it is first to be pretreated, and the sheet 7 to be connected to the plate material 7 is applied to remove the oxide layer, and the cleaning of alcohol and acetone is cleaned, and chemical vapor deposition, or physical vapor deposition, or cathode discharge or ion Plating, etc., the titanium carbide film 11 (e.g.,image 3), The thickness of the titanium carbide film 11 is controlled at 50-200 nm.

[0033]2) After the titanium carbide film 11 is prefabricated, two pieces of the titanium carbide film 11 connecting the surface of the titanium carbide film 11 are fixed to the insulating pad 3 while the electric guide rail 4 is fixed according to the size of the sheet to be welded. On the insulating pad 3, it is ensured that the conductive block 6 is slid on the electric rail 4, and can always...

Embodiment 2

[0037]A stirring friction connection device based on electroplative effect, comprising a stirring tool insulating layer 1, a stirring tool 2, an insulating pad 3, an electric rail 4, a rail support, a conductive block 6, a plate 7, a servo motor 8, pulse power supply 9, controller 10 and titanium carbide film 11, such asfigure 1 Demolivable; a titanium carbide film 11 (egimage 3), Each side of each of the non-deposited plate 7 unduminated titanium carbide film 11 is mounted, and the electric rail 4 is mounted on the insulating pad 3, the stirring tool insulating layer 1 and the insulating pad 3 are The entire stirring frictional connection is insulated from the stirring friction equipment, and the stirring tool 2 is driven by the host drives high speed and moves along the weld; the conductive block 6 is mounted on the guide rail support seat 5, the rail support seat 5 is in the servo motor 8 The drive is moved under the electric rail 4, and between the conductive block 6 is insulate...

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Abstract

A method and device for friction stir joining based on electroplastic effect, characterized in that the method includes the following steps: 1) Prefabricate a nanocrystalline titanium carbide film on the connecting surface of plates to be joined. 2) Fix the connecting surface with titanium carbide film on the insulating backing plate by butt clamping, and fix the electric guide rail on the insulating backing plate at the same time, so that the conductive block can contact the plate to be connected. 3) Connect the two electrodes of the pulse power supply to the two conductive blocks respectively. During the friction stir connection, the controller is started and a high-density pulse current is applied. The current flows through the plate to be welded and the titanium carbide film in the connection area, generating a large amount of Joule heat. The invention promotes the dislocation movement of the metal in the connection area through the coupling of the Joule heating effect, the magnetic compression effect, the skin effect and the pure electroplastic effect, reduces the flow stress in the connection area, and combines the friction stir connection process to obtain high-quality connection welding Seam to achieve friction stir joining of high melting point alloys.

Description

Technical field[0001]The present invention relates to a metal material connection technique, in particular a high melting point metal material, a frictional connection technique, specifically, a stirring frictional connection method and apparatus based on an electroplative effect.Background technique[0002]Stirring friction is a novel and environmentally friendly solid phase connection technology, which is a stirring tool (stirring head) at a constant rotational speed to the shoulder and stirring needle of the stirring tool and the mixture to be attached. When heat is hot, the temperature of the wrapped around the stirring needle is rapidly rising, reaching the thermoplastic state, while the stirring tool itself rotates, the stirring tool is also moved forward in front of the weld at a certain connection speed, the thermoplastic material around the mixing needle The rear of the stirring needle is driven downwards to the rear of the stirring needle, and a reliable weld is formed under...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B23K20/12B23K20/24
CPCB23K20/122B23K20/1245B23K20/126B23K20/24
Inventor左敦稳左立生李泽阳王子琨黎向锋
OwnerNANJING UNIV OF AERONAUTICS & ASTRONAUTICS