Friction Stir Corner Joining With a Two-Pin Guided Tool
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Solution Overview
Problem
Friction stirring in existing methods often results in metal shortage and reduced joining strength due to deformation of auxiliary members and deviation of the rotary tool's moving route during friction stir welding, especially when auxiliary members are fixed with a jig.
Innovation Solution
A joining method that uses a rotary tool with a base side pin and a tip side pin, where the tapered angle of the base side pin is larger than the tip side pin, and the outer circumferential face of the base side pin is pressed against an auxiliary member to prevent deformation and guide the tool during friction stirring, ensuring proper alignment and metal distribution.
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 only a stirring pin inserted, then metal shortage at the joining portion is prevented, but the auxiliary member is deformed and separated from the metal members during friction stirring
Solution Approach 1:
The rotary tool is divided into two distinct pins: a base side pin for stabilizing against the auxiliary member and a tip side pin for friction stirring. This segmentation allows each pin to perform its specific function without interfering with the other, resolving the contradiction between preventing metal shortage and maintaining auxiliary member stability.
Solution Approach 2:
The base side pin acts as an intermediary element between the rotary tool and the auxiliary member. By pressing the outer circumferential face of the base side pin against the auxiliary member, it provides stabilizing contact that prevents deformation and separation, while the tip side pin performs the friction stirring function.
2Device complexity
If friction stirring is performed with only a stirring pin inserted into the inner corner portion, then the process is simple, but the rotary tool moving route deviates from the set moving route
Solution Approach 1:
The rotary tool is segmented into two pins with distinct functions: the base side pin for guidance and stabilization, and the tip side pin for friction stirring. This segmentation enables precise control of the moving route while maintaining relative structural simplicity.
Solution Approach 2:
The base side pin automatically guides the rotary tool along the inner corner portion by pressing against the auxiliary member during the friction stirring process. This self-guiding mechanism maintains moving route precision without requiring additional external guidance systems or complex control mechanisms.
3Stability of the object's composition
If the auxiliary member is fixed with a jig during friction stir welding, then the auxiliary member position is initially stable, but the auxiliary member is still deformed and separated during the friction stirring process
Solution Approach 1:
The base side pin serves as an intermediary that provides continuous stabilizing contact with the auxiliary member during friction stirring. This direct contact prevents deformation and separation more effectively than initial jig fixation alone, ensuring both position stability and joining strength.
Solution Approach 2:
The invention changes the stabilization mechanism from external jig fixation to direct contact stabilization through the base side pin. This parameter change in the stabilization approach provides continuous support during the dynamic friction stirring process, preventing auxiliary member deformation and maintaining joining reliability.
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 method effectively prevents metal shortage and maintains the rotary tool's intended moving route, ensuring a suitable and strong joining of metal members by stabilizing the auxiliary member and guiding the tool accurately.
Implementation Method 1
a friction stirring process in which the first metal member, the second metal member, and the auxiliary member are joined to one another by moving the rotary tool along the inner corner portion in a state where the tip side pin which is being rotated is inserted into the inner corner portion
Data Source
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, the second metal member, and the auxiliary member are joined to one another by moving the rotary tool along the inner corner portion in a state where the tip side pin which is being rotated is inserted into the inner corner portion, is in contact with the first metal member, the second metal member, and the auxiliary member, and an outer circumferential face of the base side pin is pressed against the auxiliary member.