Segmented Grounding Prongs for Pipe Welding
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Solution Overview
Problem
Existing grounding techniques for pipe welding and other unwieldy shapes are inadequate, resulting in fragile contact angles and high resistance, which can weaken weld integrity and cause defects, and lack a means to verify connection quality.
Innovation Solution
A grounding system using conductive prongs with a centertap ground lead that securely fastens to the workpiece via a magnet or other means, coupled with an electronic circuit for measuring and indicating connection quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional work clamps are used for grounding, then grounding is achievable for workpieces with straight or flat sides, but the method is unfeasible for pipe welding or unwieldy shapes due to limited contact areas
Solution Approach 1:
The grounding device is segmented into multiple independent conductive prongs (typically three) that can be positioned separately to contact different surfaces of the workpiece. This segmentation allows the device to adapt to various geometries including pipes and unwieldy shapes while maintaining multiple contact points for reliable grounding.
Solution Approach 2:
The grounding device transitions from traditional two-dimensional clamp contact to three-dimensional multi-point contact through vertically extending prongs. The prongs can contact the workpiece at multiple locations and angles, enabling grounding on cylindrical surfaces and complex geometries that traditional clamps cannot accommodate.
2Adaptability or versatility
If grounding devices are inserted into gaps or placed on top of pipe joints secured only through gravity, then grounding can be established for pipe welding, but fragile contact angles are created that touch only a small surface resulting in high resistance
Solution Approach 1:
The grounding device incorporates a positioning mechanism that preliminarily establishes proper contact orientation before welding begins. The prongs are designed to be inserted or positioned into predetermined locations on the pipe joints, ensuring optimal contact angles and surfaces are achieved before the welding process starts, preventing fragile contacts.
Solution Approach 2:
The grounding device changes the contact parameters by using multiple prongs at different angles and positions rather than a single contact point. This distributes the electrical contact across multiple surfaces and angles, reducing overall resistance and improving connection stability for pipe welding applications.
3Ease of manufacture
If existing grounding techniques are used, then grounding connection can be established, but there is no means of measuring critical parameters such as current, voltage, and resistance to verify acceptable connection
Solution Approach 1:
The grounding device merges the grounding function with measurement and verification functions into a single integrated system. The same conductive prongs that establish the ground connection also serve as sensor leads to measure critical parameters, combining multiple functions without increasing complexity.
Solution Approach 2:
The grounding device is designed with multi-functionality, serving both as the grounding connection element and as the measurement sensor. The conductive prongs simultaneously provide electrical grounding and enable measurement of current, voltage, and resistance, eliminating the need for separate verification equipment.
4Reliability
If work clamps are used for grounding, then grounding connection can be established, but the work clamps are only suitable for workpieces of limited size and shape
Solution Approach 1:
The grounding device divides the contact function into multiple independent prongs that can be independently positioned and oriented. This segmentation allows each prong to contact different surfaces or orientations of the workpiece, enabling the device to adapt to various geometries including pipes, cylinders, and unwieldy shapes while maintaining reliable grounding connection.
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
Establishes a robust grounding connection and provides real-time feedback on connection quality, ensuring reliable welds by reducing resistance and allowing for immediate correction of faulty connections.
Implementation Method 1
A grounding system body is secured to the workpiece by a magnet
Data Source
AI summary
A grounding system is provided for welding applications. The system comprises a pair of contacts that are brought into close grounding contact with a workpiece, and a measurement circuit coupled to the contacts. The contacts may be urged into intimate contact with the workpiece by a biasing structure that pulls the contacts tightly against the workpiece. The measurement circuit may include a center-tap transformer having a secondary coupled to a ground lead and to the contacts. A primary winding of the transformer is coupled to an oscillator that executes a measurement test. The system may provide an indication of the quality of the ground in the form of an operator perceptible notification, a digitized value, or any other suitable form.