Stirring head for hybrid connection of aluminum-copper dissimilar metal objects, and welding technology

A technology of dissimilar metals and welding processes, which is applied in metal processing equipment, welding equipment, welding/welding/cutting items, etc., can solve problems such as difficult to break dispersed welded joints and welding defects, and achieve the reduction of intermetallic compounds Effects of generation, improved welding stability, and expanded welding parameter range

Inactive Publication Date: 2019-04-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This welding method mainly controls the interface temperature of the joint to be welded to keep it at 570-580°C, and stirs with the stirring head, so that the liquefied intermetallic compound at this temperature is broken and evenly dispersed in each area of ​​the joint to be welded. The liquid phase has good fluidity and fills the gap of the joint to be welded due to the capillary effect, reducing defects such as material segregation and holes in the joint to be welded, thereby improving joint performance. However, there are two difficulties in this welding method. The first is welding During the process, the temperature of 570-580°C at the interface of the joint to be welded is better for intermetallic compounds, but for the aluminum to be welded, because the temperature is higher than the ideal plasticizing state temperature, it may cause welding Defects; Secondly, for friction stir welding, it is difficult to break up the liquid phase intermetallic compound and evenly distribute it in the welded joint

Method used

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  • Stirring head for hybrid connection of aluminum-copper dissimilar metal objects, and welding technology
  • Stirring head for hybrid connection of aluminum-copper dissimilar metal objects, and welding technology
  • Stirring head for hybrid connection of aluminum-copper dissimilar metal objects, and welding technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Step 1: Use alcohol to clean the surface of the dissimilar metal plate and the oil stains and oxides on the interface that hinder the welding process, place the cleaned plate on the workbench, and fix the plate on the workbench by pressing the plate and other tooling superior.

[0052] Step 2: Start the friction stir welding equipment, adjust the position of the stirring head, first place the center point of the stirring end face directly above the center of the weld, and then move the stirring needle so that the stirring needle is completely placed on the aluminum side, and the contour line of the edge of the stirring needle is in line with the welding seam The center line is tangent, and finally adjust the distance between the contour line of the edge of the stirring needle and the center of the weld seam to determine the welding position.

[0053] Step 3: Set the welding parameters. The rotation speed of the stirring head is set between 400rpm, the welding speed is s...

Embodiment 2

[0058] Step 1: Use alcohol to clean the surface of the dissimilar metal plate and the oil stains and oxides on the interface that hinder the welding process, place the cleaned plate on the workbench, and fix the plate on the workbench by pressing the plate and other tooling superior.

[0059] Step 2: Start the friction stir welding equipment, adjust the position of the stirring head, first place the center point of the stirring end face directly above the center of the weld, and then move the stirring needle so that the stirring needle is completely placed on the aluminum side, and the contour line of the edge of the stirring needle is in line with the welding seam The center line is tangent, and finally adjust the distance between the contour line of the edge of the stirring needle and the center of the weld seam to determine the welding position.

[0060] Step 3: Set the welding parameters. The rotation speed of the stirring head is set between 600rpm, the welding speed is s...

Embodiment 3

[0065] Step 1: Use alcohol to clean the surface of the dissimilar metal plate and the oil stains and oxides on the interface that hinder the welding process, place the cleaned plate on the workbench, and fix the plate on the workbench by pressing the plate and other tooling superior.

[0066] Step 2: Start the friction stir welding equipment, adjust the position of the stirring head, first place the center point of the stirring end face directly above the center of the weld, and then move the stirring needle so that the stirring needle is completely placed on the aluminum side, and the contour line of the edge of the stirring needle is in line with the welding seam The center line is tangent, and finally adjust the distance between the contour line of the edge of the stirring needle and the center of the weld seam to determine the welding position.

[0067] Step 3: Set the welding parameters. The rotation speed of the stirring head is set between 650rpm, the welding speed is s...

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PUM

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Abstract

The invention relates to the field of dissimilar metal welding, in particular to a stirring head for hybrid connection of aluminum-copper dissimilar metal objects, and a welding technology. A stirringpin of the stirring head is cylindrical, the edge contour line of the stirring pin is tangent to a dissimilar metal interface in the welding process, the stirring pin is completely arranged on the aluminum side, and an aluminum alloy is located on the retreating side. The stirring pin drives metal on the aluminum side to flow, metal on the copper side is subjected to in-situ deformation under theextrusion action to enable internal metal to be exposed, internal metal of copper is in interatomic contact with the flowing metal on the aluminum side, the diffusion action is achieved under the action of friction heat and extrusion force, and finally metallurgical bonding is achieved. The stirring pin does not directly act on the copper side, and thus mixing between aluminum and copper is avoided.

Description

technical field [0001] The invention belongs to the welding technology, and in particular relates to a stirring head for mixed connection of aluminum-copper dissimilar metal objects and a welding process. Background technique [0002] The welding of dissimilar metals is very difficult compared with the welding of the same metals. Unlike the welding of the same metals, when welding dissimilar metals, it is necessary to consider the characteristics of the two metals and the characteristics of the two dissimilar metals. There are many factors such as metallurgical compatibility between metals, similarity in physical state, and surface tension state. There are great differences in resistivity, thermal expansion coefficient, thermal conductivity, and melting point between dissimilar metals, and due to the existence of this difference, when welding dissimilar metals, there will be areas that are very different from the base metal. These areas The existence of the metal will great...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/24B23K103/18
CPCB23K20/12B23K20/1255B23K20/24
Inventor 周琦孙宏宇时孝东孙智鸣王克鸿周明马新蕊
Owner NANJING UNIV OF SCI & TECH
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