Double-Action Friction Stir Welding With Adhesion-Based Tool Cleaning
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Solution Overview
Problem
Conventional friction stir welding methods face issues with tool longevity and welding strength, particularly when dealing with different materials and the adhesion of materials to the welding tool, leading to premature tool breakage and insufficient joint strength.
Innovation Solution
A double-action friction stir welding method and device that incorporate a cylindrical shoulder member and pin member with a projection/retraction mechanism, rotation mechanism, and advancing/retracting mechanism, along with a controller that monitors and manages an adhesion parameter to determine optimal cleaning times and prevent tool breakage by warning and prohibiting operation when adhesion thresholds are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If friction stir welding is performed continuously without cleaning, then productivity is maintained, but the welding tool breaks due to material adhesion
Solution Approach 1:
The system monitors the adhesion parameter in real-time and provides feedback to the control unit. When the adhesion parameter reaches a predetermined threshold, the system automatically issues a cleaning instruction, enabling continuous welding operation while preventing tool breakage through timely maintenance based on actual adhesion conditions
Solution Approach 2:
The system performs self-monitoring and self-maintenance by automatically detecting when the adhesion parameter reaches critical levels and triggering cleaning operations without external intervention, allowing the welding tool to service itself and maintain reliability during continuous operation
2Reliability
If the welding tool is cleaned frequently, then tool life is prolonged, but productivity decreases due to cleaning interruptions
Solution Approach 1:
The system transitions from fixed-schedule cleaning to condition-based cleaning by monitoring the adhesion parameter. Cleaning operations are performed only when the adhesion parameter reaches the predetermined threshold, optimizing the balance between tool life extension and productivity maintenance
Solution Approach 2:
The system performs cleaning operations in advance when the adhesion parameter reaches the threshold before actual tool breakage occurs, preventing catastrophic failures while minimizing interruptions to welding operations
3Productivity
If material adhesion is allowed to increase, then less frequent cleaning is needed, but welding strength decreases due to tool breakage
Solution Approach 1:
Real-time monitoring of the adhesion parameter provides feedback to determine the optimal cleaning timing, ensuring cleaning is performed at the precise moment when adhesion reaches the threshold, thereby maintaining welding strength while minimizing cleaning frequency
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 preventing tool breakage and ensuring consistent joint quality across various materials.
Implementation Method 1
welding by softening the welding object with frictional heat, the double-action friction stir welding device includes... operation (A) of performing friction stir welding for the welding object through rotation of the welding tool
Data Source
Figure 1
Figure 2
Figure 3(a)~3(f)
AI summary
A method for operating a double-action friction stir welding device including a welding tool (51) having a pin member (11) and a shoulder member (12), a projection/retraction mechanism for causing the pin member (11) to project/retract relative to the shoulder member (12), a rotation mechanism (533) for rotating a welding tool (51), and an advancing/retracting mechanism (532) for advancing/retracting the welding tool (51), the method including (B) cleaning at least one of the outer circumferential surface of the pin member (11) and the inner circumferential surface of a through hole (13) of the shoulder member (12) on the basis of the level of an adhesion parameter correlated with the degree of adhesion of the material of a welding object (60), caused by friction stir welding, on the outer circumferential surface of the pin member (11) and the inner circumferential surface of the through hole (13) of the shoulder member (12).