Joining method

Abstract

A joining method for joining metal members (1), which are a first metal member (1a) and a second metal member (1b) butted on each other, by friction stir welding by moving a rotation tool (G) relativeto the metal members. The method includes a first final welding step for applying friction stir welding from the front surface (A) side of the metal members (1) to a butted section (J1) between the first metal member (1a) and the second metal member (1b), a second final welding step for applying friction stir welding from the rear surface (B) side, a third final welding step for applying frictionstir welding from one side surface side (C), and a fourth final welding step for applying friction stir welding from the other side surface side (D). A front surface-side plasticized region (W1) anda rear surface-side plasticized region (W2), and a first side surface-side plasticized region (W3) and a second side surface-side plasticized region (W4) are superposed on each other.

Description

technical field [0001] The present invention relates to a joining method of metal members utilizing friction stirring. Background technique [0002] Friction stir welding (FSW=Friction Stir Welding) is known as a method for joining metal members to each other. Friction stir welding rotates a rotary tool and moves along the butt joints of the metal members, and the metal at the joint is plastically flowed by the frictional heat of the rotary tool and the metal members, thereby solid-state joining the metal members. In addition, in the rotary tool, a stirring pin (probe) is generally protruded from the lower end surface of the cylindrical shoulder. [0003] hereby, Figure 29 and Figure 30 It is a perspective view showing a conventional joining method of performing friction stir welding on a pair of metal members. Such as Figure 29 As shown, when the thickness of the metal members 101, 101 to be joined is greater than the length of the stirring pin of the rotary tool not ...

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

[0008] 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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