Floating Electrode Nut Welding with Guide-Pin Self-Alignment
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Solution Overview
Problem
Welding accuracy is compromised when attaching internally-threaded nuts to panels due to misalignment and inconsistent positioning, particularly in applications where external fixtures are impractical, leading to resource waste and rejected parts.
Innovation Solution
An electrode assembly with a guide pin and conductive support that centers the nut and panel openings, allowing for precise alignment and electrical connection to form a weld, enabling the electrodes to clamp and weld the nut to the panel effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If external fixtures are used to position workpieces for welding, then alignment accuracy is improved, but device complexity and practicality worsen
Solution Approach 1:
The patent removes the external fixture from the system and integrates the positioning function directly into the electrode assembly through the guide pin, which is inserted into the panel opening to provide automatic alignment without requiring separate external positioning devices
Solution Approach 2:
The guide pin acts as an intermediary element that transfers the positioning function from the panel opening to the electrode, enabling precise alignment through the pin's physical constraint rather than through complex external fixturing
2Manufacturing precision
If panel openings are positioned with tight tolerances, then welding precision is improved, but manufacturing flexibility worsens
Solution Approach 1:
The electrode assembly is made dynamically adjustable through the guide pin mechanism, which allows the electrode to self-align to variations in opening position rather than requiring fixed, rigid positioning, thereby accommodating tolerance variations without sacrificing weld accuracy
Solution Approach 2:
The system changes the positioning parameter from fixed external fixture coordinates to variable guide pin insertion depth and angle, allowing the electrode to adapt to different opening positions and tolerances while maintaining alignment accuracy
3Ease of operation
If remote fixturing is used to support panels, then ease of operation is improved, but positioning accuracy worsens
Solution Approach 1:
The guide pin serves as an intermediary that bridges the gap between the remote panel support and the electrode, transferring the positioning reference from the panel opening directly to the electrode assembly and eliminating the accumulation of errors from remote fixturing
4Adaptability or versatility
If manual manipulation of fasteners is used, then adaptability is improved, but consistency and precision worsen
Solution Approach 1:
The guide pin enables the electrode assembly to self-align and self-position over the panel opening without requiring manual manipulation or external positioning aids, achieving both consistency through automatic alignment and adaptability through the ability to accommodate varying opening positions
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 ensures accurate alignment and consistent welding of nuts to panels, reducing errors and waste by allowing the electrodes to self-adjust and maintain axial alignment, even with three-dimensional contours and varying fastener sizes, thereby improving the overall welding process.
Implementation Method 1
The conductive support is adapted for electrical connection to a power source when the assembly is installed in the welder to provide a conductive path from one pole of the power source to the electrode such that, when the contact surface contacts the first workpiece and a second electrode connected to an opposite pole of the power source is in electrical contact with the second workpiece, and the workpieces are held together, current flows through the workpieces to form a weld therebetween at the opening.
Implementation Method 2
a guide pin protruding from the first end along an axis; The guide pin fits within the opening in the first workpiece and centers the first electrode relative to the opening by movement of the first electrode relative to the conductive support in a direction transverse to the clamping direction.
Implementation Method 3
current flows through the workpieces to form a weld therebetween at the opening
Data Source
AI summary
A welder having first and second electrodes configured to clamp and weld a fastener to a workpiece at an opening in the workpiece, wherein the first electrode is configured to move in a direction transverse to a clamping direction to center the fastener with the opening. The welder can carry out a method of aligning and welding an internally-threaded nut to a panel at an opening in the panel. The method includes the steps of: centering the opening in the panel relative to a first electrode using a tapered guide pin that extends into the opening; centering the nut relative to the opening using the tapered guide pin; clamping the nut and panel between the first electrode and a second electrode; and welding the nut to the panel by passing current through the nut and panel from one of the electrodes to the other electrode.