Insulated Resistance Welding Electrodes for Narrow Flange Access

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current resistance welding systems are limited to welding flanges with a minimum dimension of 10 millimeters or more due to accessibility and cooling constraints, hindering the ability to weld narrower flanges that could offer weight reduction and design flexibility in automotive applications.

Innovation Solution

The development of welding electrodes with a maximum diameter of 13 millimeters or less, featuring insulative materials and cooling fluid channels, along with a tailored welding schedule, enables the resistance welding of flanges as narrow as 10 millimeters or less by mitigating current shunting and controlling heat distribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional welding electrodes with larger diameters are used, then adequate accessibility and cooling effects are provided, but flanges with widths of 10 millimeters or less cannot be welded

Engineering Contradiction:

Improvecapability to weld narrow flangesVSAvoidaccessibility and cooling effects

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent changes the physical parameters of the welding electrode by reducing its diameter to 13 millimeters or less, enabling access to narrow flanges that were previously inaccessible to conventional larger electrodes while maintaining functional effectiveness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The insulative material is applied locally to specific portions of the electrode body to mitigate current shunting only where necessary, rather than coating the entire electrode, thus maintaining electrical conductivity where needed while preventing harmful current paths

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If the electrode diameter is reduced to enable welding of narrow flanges, then accessibility to flanges 10 millimeters or less is improved, but current shunting occurs upon contact with the workpiece stack-up

Engineering Contradiction:

Improvecapability to weld narrow flangesVSAvoidcurrent shunting mitigation

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

An insulative material is introduced as an intermediary component between the electrode body and the workpiece stack-up to prevent harmful current shunting paths, allowing the reduced-diameter electrode to function reliably on narrow flanges

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The insulative material is positioned to extract or remove harmful current paths from the electrical circuit, directing current flow through the intended path rather than shunting through the workpiece stack-up

Inventive Principle:

Principle #2Taking out (Extraction)

3Weight of moving object

If flange width is reduced for weight reduction and design flexibility, then vehicle weight decreases and design possibilities increase, but the minimum flange width requirement of 10 millimeters cannot be met

Engineering Contradiction:

Improvevehicle weightVSAvoidweldability of narrow flanges

Core Design Contradiction:

Weight of moving objectVSAdaptability or versatility

Solution Approach 1:

The invention changes the critical parameter of electrode diameter to enable welding operations on flanges with widths of 10 millimeters or less, thereby allowing design optimizations that reduce vehicle weight without being constrained by previous minimum flange width requirements

Inventive Principle:

Principle #35Parameter changes

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

Enables effective welding of narrow flanges, reducing vehicle weight and enhancing design possibilities while maintaining electrode integrity and weld quality.

Implementation Method 1

The insulative material is configured to mitigate current shunting upon contact between the insulative material and a workpiece stack-up

Methodology Applied

Scientific EffectElectrical insulation: Electrical Resistance

Implementation Method 2

An electrical current is then passed through the workpieces from one welding electrode to the other. Resistance to the flow of the electrical current generates heat within the metal workpieces and at their faying interface

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 3

The body of the welding electrode includes interior surfaces that define a cavity configured to receive a cooling fluid

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS12409508B2Resistance welding electrodes, methods of welding flanges therewith, and vehicles

Publication Date: 2025.09.09 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

Welding electrodes, methods, and vehicles are provided. The welding electrodes include a body that includes a weld face on a distal end of the body configured to contact a workpiece and apply an electrical current thereto. The body has a maximum diameter of 13 millimeters or less. The welding electrode includes an insulative material covering at least a portion of the body, the insulative material configured to mitigate current shunting upon contact between the insulative material and a workpiece of a workpiece stack-up while using the welding electrode to resistance weld the workpiece stack-up.