Joining method of aluminum members and aluminum structure joined by the joining method

Abstract

The present invention provides a simple joining method of aluminum members that does not require molten materials or brazing filler metals, and an aluminum structure that does not have stress concentration at a joint portion and has sufficient strength. At least one of the first and second aluminum members is joined at a temperature at which the mass ratio of the liquid phase generated in the aluminum member to the total mass is 5% or more and 35% or less, and the first and second aluminum members are joined together. The joint width of the joint portion of the aluminum member is larger than the minimum width of the cross-section of the main body portion of the second aluminum member along a plane parallel to the joint plane of the first and second aluminum members.

Description

technical field [0001] The present invention relates to a method of joining aluminum members, and an aluminum structure joined by the joining method. Background technique [0002] Conventionally, various methods have been used for joining metal members. In Non-Patent Document 1, metal joining methods are roughly classified into material joining methods, chemical joining methods, and mechanical joining methods. Any of these methods is used for joining aluminum members, and specifically, material joining methods such as welding, soldering, and brazing have been used. [0003] The welding method is a method of heating, melting, and alloying joints by electricity or flames to join them. When the gap at the joint is large or when joint strength is required, the filler is melted at the time of joining to fill the gap. In this way, reliable joining is achieved due to fusion of the joining portion. On the other hand, since the joint is melted and joined, the shape near the joint...

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Problems solved by technology

On the other hand, since the joint is melted and joined, the shape near the joint may be greatly deformed, and the metal structure may also locally change greatly, resulting in a different structure and local weakening.

In addition, since only the joint part needs to be heated locally, there are also problems such as difficulty in joining multiple points at the same time.

In addition, there are problems such as residual stress due to remaining unjoined parts and weight increase due to the addition of filler materials.

[0004] In addition, in the brazing method, there are problems such as a change in shape due to flow caused by melting of the brazing material.

Even when brazing material is used in addition to the members to be joined, or when brazing material is coated and integrated on the material to be joined, a certain degree of brazing material is required, so even in the presence of, for example, Even in the case of a narrow flow path, there is a problem that the gap will be filled.

In addition, when brazing filler metal is separately prepared, assembly becomes troublesome, and there is a problem that the material cost becomes high in the case of clad material.

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