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Aluminum-steel dissimilar metal riveting and welding composite connection method

A technology for 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: 2017-09-15
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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  • Aluminum-steel dissimilar metal riveting and welding composite connection method
  • Aluminum-steel dissimilar metal riveting and welding composite connection method

Examples

Experimental program
Comparison scheme
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 an aluminum-steel dissimilar metal riveting and welding composite connection method. The aluminum-steel dissimilar metal riveting and welding composite connection method comprises the steps that pre-drilling is conducted at a lap joint position between an aluminum plate and a steel plate to be connected, so that a pre-drilled hole is obtained; a rivet penetrates through the pre-drilled hole, the rivet head end face of the rivet is made flush with the surface of the aluminum plate, and the other end of the rivet is higher than the surface of the steel plate; primary downward pressing is conducted on the rivet higher than the surface of the steel plate with a rotating pin-free stirring head, and the end face of the pin-free stirring head is made to make contact with the surface of the steel plate; and secondary pressing continues to be conducted, the rivet is made to form a countersunk rivet in the steel plate. By the adoption of the aluminum-steel dissimilar metal riveting and welding composite connection method, riveting and diffusive welding composite connector of the aluminum-steel dissimilar metals can be obtained, the problems that during fusion welding of aluminum-steel dissimilar materials, too much brittle intermetallic compounds are generated, and the seal performance and fatigue performance of a connector are poor in riveting are solved, dual advantages of riveting and welding are achieved, and the tensile strength and fatigue performance of the connector are improved.

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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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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