Joining method

Abstract

A joining method for joining metal members, which are a first metal member and a second metal member butted on each other, by friction stir welding by moving a rotation tool relative to the metal members. The method includes a first permanent joining step; a second permanent joining step; a side permanent joining step; a preparing step, arranging a pair of protruding materials at two sides of a butted section before at least one of the permanent joining steps, and carrying out preliminary friction stir on the butted section of the protruding materials and metal members to be joined; and a bottom hole forming step, forming a bottom hole in advance on an insertion preset position of a permanent joining rotary tool used in one permanent joining step, wherein the permanent joining rotary tool includes a cylindric shoulder and a stir pin arranged in a protruding manner in the center of the lower end face of the shoulder, the stir pin shapes like a cone frustum with a thin front end, and a plastification zone formed by the first permanent joining step and the second permanent joining step overlaps with the plastification zone formed by the side permanent joining step.

Description

[0001] The invention patent application is a divisional application of the invention patent application whose international application number is PCT / JP2008 / 060523, the international filing date is June 9, 2008, the application number that entered the Chinese national phase is 200880020211.4, and the name is "joining method" . Technical field [0002] The present invention relates to a joining method of metal members using friction stirring. Background technique [0003] The method of joining metal members to each other is known as friction stir welding (FSW=Friction Stir Welding). The friction stir welding causes the rotating tool to rotate and move along the butting portion of the metal members, and the metal in the butting portion is plastically flowed by the frictional heat between the rotating tool and the metal member, thereby solid-phase bonding of the metal members. In addition, a rotating tool generally has a stirring pin (probe) protruding from the lower end surface of ...

AI Technical Summary

Problems solved by technology

However, since the rotating tool buries the stirring pin in the metal member 111 and moves while rotating at a high speed, when the length of the stirring pin increases, the load acting on the driving device of the friction stirring device and the stirring pin increases, causing the device to The problem of short life

[0009] Also, if Figure 29 and Figure 30 As shown, in the plasticized regions 105, 106, there may be a continuous cavity defect 109 from one side 107 to the other side 108

The above-mentioned cavity defect 109 is one of the reasons for the reduction of watertightness and airtightness between the side surfaces 107 and 108 of the metal members 101 and 111

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