Friction Stir Welding Gradual Cooling High-Frequency Heating
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Solution Overview
Problem
Conventional friction stir welding techniques fail to achieve high-quality welds due to inadequate control over welding conditions, leading to suboptimal results, especially when welding high-tensile strength steel plates or materials with significant differences.
Innovation Solution
A friction stir welding apparatus equipped with a gradual cooling device that post-heats the weld site using a contactless high-frequency heat source, delaying natural cooling and maintaining the weld temperature to prevent structural alterations, thereby enhancing weld quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional friction stir welding is performed with controlled welding temperature, then welding temperature control accuracy is improved, but welding quality remains inadequate
Solution Approach 1:
The gradual cooling device is activated immediately after welding to preemptively manage the cooling process. By applying controlled heating during the natural cooling phase, the system prevents harmful rapid temperature changes before they can cause welding defects, thus improving welding quality while maintaining temperature control accuracy.
Solution Approach 2:
The invention changes the thermal parameter dynamics by transitioning from static temperature control during welding to dynamic temperature management during cooling. The gradual cooling device adjusts heating parameters in real-time based on the cooling phase, enabling precise control over the temperature evolution curve to achieve high welding quality.
2Measurement precision
If welding temperature is controlled within a predetermined range, then temperature control precision is improved, but weld site structural integrity deteriorates due to rapid cooling
Solution Approach 1:
The gradual cooling device applies preliminary anti-action by heating the weld site during the natural cooling process. This counteracts the harmful rapid cooling effect before it can cause structural deterioration, preventing cracking and maintaining tensile strength while preserving temperature control precision achieved during welding.
Solution Approach 2:
The invention converts the harmful rapid cooling effect into a beneficial controlled gradual cooling process. By applying controlled heating during cooling, the system transforms what would be a damaging thermal shock into a manageable thermal evolution that maintains structural integrity while preserving the precision temperature control established during welding.
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 solution effectively delays natural cooling of the weld site, preventing defects like cracking and maintaining the tensile strength of high-tensile strength steel plates, while ensuring high-quality friction stir welding across various material combinations.
Implementation Method 1
post-heats the weld site using a contactless high-frequency heat source
Implementation Method 2
welds a plurality of to-be-welded members to each other by friction stir
Data Source
AI summary
A friction stir welding apparatus includes a FSW tool that is held by a housing and welds to-be-welded members to each other by friction stir, and a gradual cooling device that gradually cools a weld site of the to-be-welded members welded by the FSW tool. The gradual cooling device is a contactless heat source that heats the weld site without coming into contact with the weld site. The contactless heat source is a high-frequency heat source.