Friction Stir Corner Joining with Guided Auxiliary Member
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Solution Overview
Problem
Existing friction stir welding methods face issues with metal shortage and reduced joining strength due to deformation of auxiliary members and deviation of the rotary tool's moving route during friction stirring, leading to poor joining quality.
Innovation Solution
The method involves pressing the outer circumferential face of the base side pin of the rotary tool against the auxiliary member to prevent its separation from the metal members and guide the tool to maintain the set moving route, ensuring stable friction stir welding and preventing metal leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an auxiliary member is disposed at the inner corner portion and friction stir welding is performed with the auxiliary member fixed by a jig, then metal shortage at the joining portion can be prevented, but the auxiliary member may be deformed and separated from the metal members during friction stirring
Solution Approach 1:
The patent changes the auxiliary member from a static fixed component to a dynamic guided component. The auxiliary member is no longer rigidly fixed by a jig but is instead guided by the base side pin of the rotary tool, allowing it to move dynamically while maintaining contact with the metal members. This dynamic arrangement prevents both deformation/separation of the auxiliary member and metal shortage at the joining portion.
Solution Approach 2:
The base side pin of the rotary tool serves as an intermediary element between the rotary tool and the auxiliary member. Instead of directly fixing the auxiliary member with a jig, the base side pin presses against the auxiliary member to guide its movement and maintain its position. This intermediary mechanism resolves the contradiction by providing both support and flexibility.
2Reliability
If an auxiliary member is disposed at the inner corner portion, then metal shortage at the joining portion can be prevented, but the rotary tool may be pushed by the auxiliary member causing deviation from the set moving route
Solution Approach 1:
The patent implements a dynamic guiding system where the base side pin of the rotary tool actively guides the auxiliary member rather than passively being pushed by it. This reverses the force relationship - the rotary tool controls the auxiliary member's movement through the pressing action of the base side pin, preventing deviation from the set moving route while still preventing metal shortage.
Solution Approach 2:
The patent inverts the traditional force relationship between the rotary tool and auxiliary member. Instead of the auxiliary member being a passive element that may push the rotary tool off course, the base side pin of the rotary tool becomes the active guiding element that presses against and controls the auxiliary member's movement. This inversion eliminates the pushing effect while maintaining the beneficial metal prevention function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively prevents metal shortage and ensures suitable joining by maintaining the integrity of the auxiliary member and the rotary tool's path, resulting in improved joining quality and reduced burrs.
Implementation Method 1
friction stir welding is performed in a state where the outer circumferential face of the base side pin of the rotary tool is pressed against the auxiliary member
Implementation Method 2
friction stir welding
Data Source
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AI summary
An object of the present invention is to provide a joining method by which metal members can be suitably joined to each other. The present invention is characterized by including a friction stirring process in which the first metal member (1), the second metal member (2), and the auxiliary member (10) are joined to one another by moving the rotary tool (F) along the inner corner portion in a state where the tip side pin (F3) which is being rotated is inserted into the inner corner portion, is in contact with the first metal member (1), the second metal member (2), and the auxiliary member (10), and an outer circumferential face of the base side pin (F2) is pressed against the auxiliary member (10).