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Bonding method of dissimilar materials made from metals and bonding structure thereof

A technology of dissimilar materials and metal materials, applied in metal processing equipment, welding/cutting media/materials, welding/welding/cutting items, etc., can solve problems such as excessive resistance heating

Active Publication Date: 2008-10-01
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, resistive heating in the same material interface becomes excessive when the required heat is supplied to create a sufficiently large nugget at the dissimilar material interface

Method used

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  • Bonding method of dissimilar materials made from metals and bonding structure thereof
  • Bonding method of dissimilar materials made from metals and bonding structure thereof
  • Bonding method of dissimilar materials made from metals and bonding structure thereof

Examples

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Embodiment Construction

[0020] The bonding method disclosed here can sufficiently secure bonding strength in each interface in which a desired nugget diameter can be formed while preventing reduction in material thickness on the low melting point side. This method can be utilized when three or more sheets of dissimilar materials made of metal are laminated and joined by a resistance welding operation. This method can also be utilized for combinations of materials having both a homogeneous material interface and a dissimilar material interface where the resistive heating in the dissimilar material interface is less than the resistive heating in the same material interface due to the difference in contact resistance of the two interface diameters . A bonded structure obtained by such a bonding method is also disclosed. Engagement structures are, for example, components of a vehicle, such as doors, hoods, and the like.

[0021] The present invention is explained based on the following examples, althou...

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Abstract

Disclosed is a bonding method for dissimilar materials made from metals and its resulting structures. The materials to be bonded are formed by layering three or more sheets such that a dissimilar material interface and a same material interface are formed. A first current is conducted between a three-sheet layered plate material wherein an aluminum alloy plate, a zinc plated steel plate and a bare steel plate, for example, are layered in order. A nugget is formed in an interface between the zinc plated steel plate and the bare steel plate, which are the same materials. Then, a second current greater than the first current is conducted, and a nugget is formed in an interface between the aluminum alloy plate and the zinc plated steel plate.

Description

technical field [0001] The present invention relates to joining techniques utilizing resistance welding of dissimilar metal materials such as steel materials, aluminum alloy materials, and the resulting structures. Specifically, the present invention relates to a joint structure in which the material is formed by laminating three or more sheets and has a dissimilar material interface and a same material interface. Background technique [0002] When joining dissimilar metals, if the same joining process is used as that used to join the same materials, sufficient joint strength cannot be obtained due to the formation of weak intermetallic compounds. For example, when joining aluminum alloys and steel materials, brittle intermetallic compounds with high hardness are formed, such as Fe 2 Al 5 or FeAl 3 . Such intermetallic compounds need to be controlled to ensure joint strength. [0003] However, a fine and hard oxide coating is formed on the surface of the aluminum alloy....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/20B23K11/10
CPCB23K11/20B23K11/256B23K11/34B23K35/226B23K2103/15B23K2103/20
Inventor 宫本健二中川成幸
Owner NISSAN MOTOR CO LTD
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