Double-Action Friction Stir Welding Tool Cleaning by Adhesion Feedback
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Solution Overview
Problem
Conventional double-action friction stir welding methods face issues with tool longevity due to inadequate cleaning techniques and insufficient welding strength, especially when working with different materials.
Innovation Solution
A method and device that utilize a cylindrical shoulder member and pin member with a projection/retraction mechanism, rotation mechanism, and advancing/retracting mechanism, where the welding tool is cleaned based on an adhesion parameter to prolong tool life and enhance welding strength by monitoring and analyzing the degree of material adhesion during friction stir welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional cleaning methods are used for the welding tool, then the cleaning process is simple, but the life of the welding tool is insufficient
Solution Approach 1:
The adhesion parameter monitoring system detects material adhesion on the welding tool before it reaches critical levels that would cause tool breakage. By performing cleaning operations based on monitored adhesion thresholds rather than waiting for failure, the system proactively maintains tool integrity and extends tool life.
Solution Approach 2:
The system continuously monitors the adhesion parameter during welding operations and uses this feedback to determine when cleaning is required. This closed-loop control ensures cleaning is performed at optimal moments to prevent tool failure while avoiding unnecessary cleaning operations.
2Strength
If only aluminum alloy plate is caused to plastically flow in friction stir welding, then the process is simple, but the welding strength is insufficient
Solution Approach 1:
The system changes the welding process parameters by controlling the relative projection/retraction of the pin member to enable sequential plastic flow of different materials (aluminum alloy first, then steel plate). This parameter adjustment transforms a simple single-material flow process into a controlled multi-material flow process that achieves superior welding strength.
Solution Approach 2:
The pin member's dynamic projection and retraction relative to the shoulder member creates varying welding conditions during the process. This dynamic adjustment allows the system to first cause aluminum alloy plastic flow, then induce steel plate plastic flow, resulting in enhanced welding strength through controlled multi-stage material deformation.
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
The method effectively prolongs the life of the welding tool and enhances welding strength by strategically cleaning the tool based on adhesion parameters, preventing breakage and ensuring robust joints even with dissimilar materials.
Implementation Method 1
welding a welding object by softening the welding object with frictional heat through rotation of a welding tool
Data Source
AI summary
A method for operating a double-action friction stir welding device including a welding tool having a pin member and a shoulder member, a projection/retraction mechanism for causing the pin member to project/retract relative to the shoulder member, a rotation mechanism for rotating a welding tool, and an advancing/retracting mechanism for advancing/retracting the welding tool, the method including cleaning at least one of the outer circumferential surface of the pin member and the inner circumferential surface of a through hole of the shoulder member on the basis of the level of an adhesion parameter correlated with the degree of adhesion of the material of a welding object, caused by friction stir welding, on the outer circumferential surface of the pin member and the inner circumferential surface of the through hole of the shoulder member.