Portable Friction Welding Tool With Automated Thrust Control
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Solution Overview
Problem
Existing welding methods for attaching fastening elements to substrates, such as stainless steel or aluminum, are inefficient, hazardous, and require specialized skill, limiting their use in environments like underwater applications.
Innovation Solution
An automated portable friction welding system using pneumatic, hydraulic, or electrical power to automate the welding process, featuring a tool housing with a rotary motor, actuator, and collet, which includes a control system for precise thrust and forging phases to create high-quality welds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional welding methods (arc welding, oxyfuel gas welding) are used to attach fastening elements to substrates, then strong weld bonds can be achieved, but hazardous conditions (open flame, arc, electrical discharge) are created that are unsafe in environments with combustible gases
Solution Approach 1:
The patent replaces thermal welding processes (arc welding, oxyfuel gas welding) with friction welding, which uses mechanical friction and pressure to create metallurgical bonds. The friction welding device rotates the fastening element against the substrate under controlled pressure, generating heat through friction rather than external flame or arc, thereby eliminating fire hazards while maintaining strong weld bonds
Solution Approach 2:
The invention changes the fundamental parameters of the welding process by using controlled rotational speed, axial pressure, and friction time instead of thermal parameters like flame temperature or arc voltage. This allows the welding process to be conducted without open flame or electrical discharge, making it safe for use in environments with combustible gases while still achieving strong metallurgical bonds
2Strength
If conventional welding methods are used, then weld bonds can be formed, but structural integrity of adjacent material is compromised due to heat generation
Solution Approach 1:
The friction welding process concentrates heat generation strictly at the interface between the rotating fastening element and the substrate. The localized friction heat only affects the immediate contact zone where metallurgical bonding occurs, while adjacent materials remain unaffected and retain their original structural integrity and material properties
Solution Approach 2:
By replacing external thermal sources (flame, arc) with internally generated friction heat, the patent achieves welding without the broad thermal field that would otherwise heat and compromise adjacent materials. The mechanical friction process confines thermal energy to the precise location needed for bonding
3Ease of manufacture
If drilling and tapping methods are used to attach fastening elements, then mechanical attachment can be achieved, but excessive time is required for the installation process
Solution Approach 1:
The friction welding process performs attachment in a continuous operation where the fastening element is rotated against the substrate under pressure, creating a metallurgical bond in seconds. This eliminates the multiple discrete steps of drilling, chip removal, and tapping required in mechanical attachment methods, dramatically reducing installation time while maintaining strong attachment
Solution Approach 2:
The invention utilizes the phase transition of material at the friction interface from solid to plasticized state and back to solid, creating a metallurgical bond in a single continuous process. This phase change mechanism allows direct attachment without the multiple steps of hole creation and thread formation required in conventional mechanical attachment
4Productivity
If friction welding systems are used to attach fastening elements, then efficient and consistent welds can be achieved, but highly specialized skilled labor is required to operate them successfully
Solution Approach 1:
The friction welding device is designed to be self-regulating, where the friction process itself provides feedback on progress. As the fastening element rotates and friction heat is generated, the process naturally progresses through defined stages (burn-off, upset, cool-down) that can be automatically controlled, reducing the need for highly skilled operators to manually manage complex welding parameters
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 system enables efficient, consistent, and high-quality welds in various environments, including underwater, without the need for specialized labor, by automating the friction welding process.
Implementation Method 1
Friction induces very localized heating from rotating a workpiece held against a substrate to which it is being joined
Implementation Method 2
After the material at this intersection has plasticized, rotation stops and forging pressure holds the workpiece against the substrate
Implementation Method 3
After the material at this intersection has plasticized, rotation stops and forging pressure holds the workpiece against the substrate until the localized plasticized material fully solidifies
Implementation Method 4
holding that thrust or forging force from the actuator at the interface of the workpiece and substrate until the localized plasticized material fully solidifies and the weld is complete
Data Source
AI summary
An automated system, method and tool for portable friction welding is disclosed for joining a rotatable workpiece to a substrate. A control system is disclosed receiving a start input to cause a motor to rapidly spin the workpiece and initiate a first thrust building cycle acting through an actuator to progressively force the spinning workpiece against the substrate. The materials at this intersection heat and plasticize and the actuator translates toward the substrate until the end of the desired actuator stroke operates to cut the motor off and to initiate and then hold a second axial thrust cycle on the actuator and there through to the interface of the workpiece and substrate. A reset input at the end of a cool off phase releases the thrust in the actuator.