Friction Stir Welding Probe Recesses for Smooth Plastic Flow
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Solution Overview
Problem
Friction stir welding tools with outer circumferential recesses struggle to achieve desired welding quality due to the lack of a surface to guide softened material from the recesses to the front end of the probe, resulting in incomplete plastic flow.
Innovation Solution
A friction stir welding tool with a probe featuring outer circumferential recesses extending to the front end surface, where a central front end recess is formed to store and guide the softened material, ensuring smooth plastic flow and improved welding quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If outer circumferential recesses are formed in the probe, then material can be taken into the recesses from the lateral side, but the softened material cannot flow smoothly toward the front end because there is no storage surface at the front end
Solution Approach 1:
The front end recess is formed in advance on the front end surface of the probe, creating a pre-prepared storage space for softened material before the welding process begins. This allows the material to be directed and stored in the intended location, ensuring smooth plastic flow and proper joint formation during welding.
2Device complexity
If the front end surface is kept flat without recesses, then the structure is simple, but the plastic flow of softened material cannot be generated smoothly
Solution Approach 1:
The front end surface is segmented by forming a recess that separates the storage function from the surrounding flat surface. This segmentation creates a dedicated space for material accumulation while maintaining the overall simplicity of the probe structure, allowing the flat surface to remain for other functions while the recess specifically handles material storage.
3Ease of operation
If outer circumferential recesses extend to the front end surface, then material can be guided laterally, but without a front end recess the material cannot be stored and directed forward
Solution Approach 1:
The front end recess acts as an intermediary element between the outer circumferential recesses and the front end of the probe. It receives the softened material from the lateral recesses and provides a storage space that enables the material to be properly directed forward, mediating the transition from lateral material intake to forward material flow.
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 tool effectively generates and directs the plastic flow of softened material, enhancing the welding quality by providing a dedicated surface for material storage and guidance, leading to improved joint formation.
Implementation Method 1
material of the workpiece softened by friction heat of the probe
Implementation Method 2
generate plastic flow of the softened material toward the front end of the probe
Data Source
AI summary
A friction stir welding tool includes a probe having a front end surface and an outer circumferential surface. Outer circumferential recesses are formed in the probe. The outer circumferential recesses extend along the rotational axis of the probe up to the front end surface. The friction stir welding tool rotates the probe about the rotation axis, and embeds the probe inside a workpiece during rotation of the probe to weld the workpiece. A front end recess is formed in the front end surface. The front end recess is positioned at the central part of the front end surface, and connected to the outer circumferential recesses.