Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Stir friction eutectic reaction welding method for lap joint of dissimilar metal

A eutectic reaction, friction stir technology, used in metal processing, metal processing equipment, welding/welding/cutting items, etc., can solve the problems of cracks in the interface structure, uneven weld bead, low fracture load, etc., to reduce tool Wear, process simplification, effect of increased soldering temperature

Inactive Publication Date: 2016-06-01
XI AN JIAOTONG UNIV
View PDF5 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] The purpose of the present invention is to solve a series of problems that exist when the friction stir brazing of copper / aluminum combination is carried out at copper surface friction: (1) poor surface formation (when using Sn solder, the bead is not smooth, and there are corrosions of different sizes pits and surface cracks), (2) cracks in the interfacial structure (Zn solder), (3) low fracture load (the joint cracks automatically when Zn solder is used for sample preparation; the fracture is smooth when Sn solder is used), (4) brazing Materials and their pre-cleaning consumables are time-consuming, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Stir friction eutectic reaction welding method for lap joint of dissimilar metal
  • Stir friction eutectic reaction welding method for lap joint of dissimilar metal
  • Stir friction eutectic reaction welding method for lap joint of dissimilar metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1: Preparation of Cu / Al lap joints by single pass friction stir eutectic reaction welding

[0054] Commercially available pure copper plate T2 and pure aluminum 1060 with a thickness of 2mm (measured 1.96mm) are selected as the parts to be welded, and the specifications are 100×60×2mm. The assembly method of lap joint is adopted, the area of ​​the lap area is 100×30mm, the upper plate is copper plate, and the lower plate is aluminum plate, such as figure 1 shown. The material of the stirring head is 1Cr13 martensitic stainless steel, the diameter D=20mm, and no needle. The joint quality was evaluated by surface forming quality, shear strength and interface compactness. The welding process parameters are shown in Table 1.

[0055] Table 1. Process parameters of joint preparation by Cu / Al friction stir eutectic reaction welding

[0056]

[0057] Surface forming quality: under the conditions of welding process parameters (1180-150-3°-0.2-20) the joint appear...

Embodiment 2

[0062] Example 2: Preparation of Cu / Al composite plate by multi-pass friction stir eutectic reaction welding

[0063] image 3 (b) Untreated Cu / Al composite plate prepared by friction stir eutectic reaction welding technique. Commercially available pure copper plate T2 and pure aluminum 1060 with a thickness of 2mm (measured 1.96mm) are selected as the parts to be welded, and the specifications are 100×60×2mm. The stirring head is a needleless stirring head with a diameter of D=20mm, and the material is 1Cr13 martensitic stainless steel. For the assembly method and welding process during welding, see figure 2 (a), (b), (c) and (d), the copper plate completely covers the aluminum plate, and the area of ​​the overlapping area is 100×60mm. When welding, the welded area is on the retreat side, and the unwelded area is on the On the advancing side, start the first weld seam from ~5mm from the pressure block (see figure 2 (a)), perform the second welding in the direction of th...

Embodiment 3

[0066] Example 3: Fabrication of Al / Zn joints by friction stir eutectic reaction welding

[0067] Commercially available pure aluminum 1060 with a thickness of 2mm (measured 1.96mm) and pure zinc with a thickness of 3mm are selected as the parts to be welded, and the specifications are 100×60×2mm and 100×60×3mm respectively. The material of the stirring head is 1Cr13 martensitic stainless steel, the diameter D=20mm, and no needle. The assembly method of the lap joint is adopted, the area of ​​the lap area is 100×25mm, the upper end is an aluminum plate, and the lower end is a zinc plate, such as figure 1 shown. The welding process parameters are shown in Table 3.

[0068] Table 3. Process parameters of Al / Zn joints prepared by friction stir eutectic reaction welding

[0069]

[0070] See image 3 (c): The joint is formed smoothly, without obvious flash and burrs, and there are extruded eutectic liquid phase solidified metal balls on the edge of the overlapping area, ind...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Shear strengthaaaaaaaaaa
Shear strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a stir friction eutectic reaction welding method for lap joint of dissimilar metal. A needle or no-needle tool is adopted in the welding process; brazing filler metal has no need to be preset on an interface; the annealing or preheating is not needed before welding; friction heat between a shaft shoulder of the tool and the surface of base metal is used; an eutectic liquid phase is obtained by using high interface temperature on the interface and the caused eutectic reaction; and the shaft shoulder is used for extruding the eutectic reaction to break an oxide film and to discharge a low-melting-point brittle eutectic structure so as to finally form a diffusion structure. The method is suitable for a base metal composition with the eutectic reaction, such as aluminum / copper and aluminum / zinc compositions, in particular, suitable for the working condition of large-area lap joint, and comprises preparation of a composite board.

Description

technical field [0001] The invention relates to lap joint welding of heterogeneous eutectic metals (such as Cu / Al combination, Cu / Ti combination, Al / Zn combination, Al / Mg combination) and a composite plate preparation method thereof. Background technique [0002] Copper / aluminum large-area lap joints (thin copper on the top, thick aluminum on the bottom) are widely used in the radiator industry (such as the CPU industry), the power industry (transmission busbar), the metallurgical industry (power supply busbar) and other industries. Improving the heat dissipation effect of the radiator is of great significance to improving the CPU operation speed of large-scale computers. Usually, a layer of 5-6mm thick copper plate is brazed on the reverse side of the aluminum alloy heat dissipation fin, or a copper heat pipe is used to wrap the aluminum alloy fin structure. , in order to improve the heat dissipation effect, the copper-aluminum joint adopts the plate-plate or tube-plate lap...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B23K20/12B23K103/18
CPCB23K20/122B23K20/1275B23K20/129B23K2101/14B23K2103/18
Inventor 张贵锋倪显清张林杰牛靖
Owner XI AN JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com