A method for composite connection of aluminum-steel dissimilar metals by riveting and welding

A technology of dissimilar metals and composite connections, applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., and can solve problems such as cracking and poor fatigue performance

Active Publication Date: 2019-05-03
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method provided by the invention solves the shortcomings of too many brittle intermetallic compounds produced in the joints during fusion welding of dissimilar materials of aluminum and steel, cracking caused by cold punching in riveting, and poor fatigue performance. It has the dual advantages of riveting and welding, and increases Joint tensile strength and fatigue properties

Method used

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  • A method for composite connection of aluminum-steel dissimilar metals by riveting and welding
  • A method for composite connection of aluminum-steel dissimilar metals by riveting and welding
  • A method for composite connection of aluminum-steel dissimilar metals by riveting and welding

Examples

Experimental program
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Effect test

Embodiment 1

[0042] First, cut the 4mm thick 2A14 aluminum alloy into 100mm×40mm×4mm plates, and also cut the 2mm thick galvanized steel plate into 100mm×40mm×2mm samples to be welded, and use a drill with a diameter of 4mm at the riveting point. Drilling, drill a tapered countersunk hole in the lower part of the steel plate, polish the butt joint surface with 400# sandpaper, and clean the drilling burr with a file, and finally clean the joint with acetone;

[0043] Insert the cleaned rivet with a tapered rivet head from below. The material of the rivet is 2A14 aluminum alloy. The bottom of the rivet is flush with the bottom of the lower plate, and the upper part is 4mm higher than the upper plate. Clamp and wait for welding;

[0044] A 12mm-diameter end surface without a stirring pin is used to rotate and press in the stirring head, and the rotation speed of the stirring head is 1500r / min. When the end surface of the stirring head contacts the upper plate, press down 0.2mm and keep for 30s...

Embodiment 2

[0047] First, cut the 4mm thick 2A14 aluminum alloy into 100mm×40mm×4mm plates, and also cut the 2mm thick galvanized steel plate into 100mm×40mm×2mm samples to be welded, and use a drill with a diameter of 6mm at the riveting point. Drilling, drill a tapered countersunk hole in the lower part of the steel plate, polish the butt joint surface with 400# sandpaper, and clean the drilling burr with a file, and finally clean the joint with acetone;

[0048] Insert the cleaned rivet with a tapered rivet head from below. The material of the rivet is 7A04 aluminum alloy. The bottom of the rivet is flush with the bottom of the lower plate, and the upper part is 4mm higher than the upper plate. Clamp and wait for welding;

[0049] A stirring head with a diameter of 16mm and no stirring needle is used to rotate and press in. The rotating speed of the stirring head is 1500r / min. When the end face of the stirring head is in contact with the upper plate, press down 0.2mm, and the welding ti...

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Abstract

The invention provides a method for riveting and welding composite connections of aluminum-steel dissimilar metals. The invention provides a method for riveting and welding compound connection of aluminum-steel dissimilar metals: pre-drilling is performed at the overlapping joint between the aluminum plate and the steel plate to be connected to obtain a pre-drilled hole; the rivet is inserted into the pre-drilled hole to make the rivet The end face of the rivet is flush with the surface of the aluminum plate, and the other end of the rivet is higher than the surface of the steel plate; use a rotating needleless stirring head to press the rivet above the surface of the steel plate for the first time, so that the end face of the needleless stirring head is in line with the steel plate surface contact; then proceeds with a second press down, causing the rivet to form a countersunk head in the plate. The present invention can obtain aluminum-steel dissimilar metal riveting and diffusion welding composite connection joints, which solves the problem of excessive brittle intermetallic compounds produced in the joints during fusion welding of aluminum / steel dissimilar materials, poor airtightness and poor fatigue performance of the joints during riveting Poor disadvantages, realize the dual advantages of riveting and welding, and increase the tensile strength and fatigue performance of the joint.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a method for riveting and welding composite connections of aluminum-steel dissimilar metals. Background technique [0002] With the development of the automobile and aircraft industries, the requirements for lightweight are getting higher and higher. In the process of structural design, optimizing the structure and selecting lightweight materials have become important design ideas for reducing structural weight. Therefore, the connection of dissimilar metals is more and more widely used, such as the aluminum alloy and high-strength steel that are widely used in the automotive industry. In the design of new aircraft, in order to increase the structural strength of the aircraft, improve the fatigue life, and reduce the weight of the aircraft, a large number of composite structures of high-strength steel and light alloy materials are used. However, when dissimilar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00B23K20/12B23K103/20
CPCB23K20/1225B23K20/1255B23K2103/20B23P15/00
Inventor 陈玉华曹文明冯良清刘颖李树寒
Owner NANCHANG HANGKONG UNIVERSITY
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