Friction Stir Welding Probe Recess Layout for Plastic Flow Control
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Solution Overview
Problem
Existing friction stir welding tools face challenges in achieving sufficient plastic flow of softened material towards the probe tip, leading to suboptimal welding quality and machining speed.
Innovation Solution
The tool features a probe with outer circumferential recesses extending to the front end surface and a non-communicating front end recess on the outer circumferential surface, allowing for effective machining and guiding softened material towards the center for improved stirring and welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If only outer circumferential recesses are formed in the probe, then material can be taken into the recesses from the lateral side, but sufficient plastic flow of softened material toward the front end cannot be generated
Solution Approach 1:
The probe surface is segmented into two distinct recess systems: outer circumferential recesses for lateral material intake and front end recesses for forward material flow guidance. This segmentation allows each recess type to specialize in its specific function, ensuring both sufficient plastic flow quantity and proper material distribution for high-quality welding.
Solution Approach 2:
Different regions of the probe are given different structural qualities: the outer circumferential surface has recesses optimized for material intake from the sides, while the front end surface has recesses optimized for guiding material flow forward. This local differentiation ensures that each area contributes optimally to the overall welding process.
2Ease of manufacture
If only edges forming front end edge portions of outer circumferential recesses are formed in the front end surface, then workpiece machining is effective, but machining speed is limited
Solution Approach 1:
The solution adds a new dimensional element by forming front end recesses that extend from the front end surface toward the outer circumferential surface. This creates additional cutting edges in a new spatial dimension, increasing the number of active machining edges without compromising the effectiveness of the original outer circumferential recess edges.
3Productivity
If front end recess does not communicate with outer circumferential recess, then machining speed increases, but material flow guidance must be ensured
Solution Approach 1:
The front end recess is extracted as a separate, non-communicating structure from the outer circumferential recess system. This independence allows the front end recess to focus solely on guiding material flow forward without being constrained by the material intake function of the outer circumferential recesses, thereby increasing machining speed while maintaining precise material flow control.
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 design enhances machining speed and achieves superior welding quality by efficiently generating and guiding plastic flow of softened material, ensuring effective stirring and bonding of workpiece materials.
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. The outer circumferential surface has, formed therein, outer circumferential recesses extending to the front end surface. The friction stir welding tool is configured to rotate the probe about a rotation axis, and embed the probe inside a workpiece during rotation of the probe to thereby weld the workpiece. A front end recess is formed in the front end surface, and the front end recess extends to the outer circumferential surface in a manner that the front end recess does not communicate with the outer circumferential recesses.