Grounding Lug for Electric Welding Systems
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Solution Overview
Problem
Existing electric welding systems face issues with excessive mechanical interfaces and electrical discontinuities between workpieces and grounding cables, leading to increased electrical resistance and potential sparks or arcing, especially when workpieces shift on support members.
Innovation Solution
A work stand with a base plate and integral or separate grounding lugs that provide a reliable electrical connection, featuring a design with a grounding lug that is accessible for cable clamps and can be integrated or non-integral with the support member, allowing for reduced mechanical interfaces and improved stability during welding operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the grounding cable is attached to the workpiece itself, then the electrical connection is established, but workpiece movement disrupts the connection and the cable becomes entangled
Solution Approach 1:
The grounding system is segmented into separate components: a grounding component attached to the work stand and a grounding cable clamp that attaches to the grounding component. This separation allows the workpiece to be moved independently without disrupting the grounding connection, as the cable remains connected to the stationary grounding component rather than the movable workpiece.
Solution Approach 2:
A grounding component serves as an intermediary element between the work stand and the grounding cable. This intermediate component provides a stable attachment point for the cable while allowing the workpiece to be positioned and moved freely on the work stand without affecting the grounding connection.
2Reliability
If mechanical assemblies are used to attach grounding cables to support members, then reliable electrical connection is ensured, but excessive mechanical interfaces increase electrical resistance
Solution Approach 1:
The invention extracts and eliminates unnecessary mechanical interfaces from the grounding path. By providing a grounding component with a built-in cable clamp attachment, the design removes intermediate clamps and connection mechanisms that would otherwise create multiple mechanical interfaces and increase electrical resistance along the grounding path.
Solution Approach 2:
The grounding component combines multiple functions into a single integrated element: it serves as both the electrical connection point and the cable attachment mechanism. This merging eliminates the need for separate mechanical assemblies and multiple interfaces, thereby reducing electrical resistance while maintaining reliable connection.
3Reliability
If grounding cables are attached to support members, then electrical discontinuities are reduced, but the cables interfere with workpiece placement and movement
Solution Approach 1:
The system is segmented so that the grounding component is fixed to the work stand while the workpiece is independently positionable on the work stand. This segmentation allows the grounding cable to remain stationary and connected to the grounding component, while the workpiece can be placed and moved freely without the cable interfering, as the cable is not attached to the workpiece itself.
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 reduces electrical resistance and minimizes the occurrence of sparks or arcing by providing a stable and direct electrical path, enhancing the reliability of the welding process even when workpieces are moved or rotated.
Implementation Method 1
a grounding path for the grounding or work cable... establish a grounding path... reduced mechanical interfaces and electrical discontinuities along a grounding path
Data Source
AI summary
A variety of work stands and support assemblies for supporting workpieces such as pipes, are described. The work stands include a base plate and a welding stand-off or grounding lug, at which an electrical grounding cable can be readily attached.