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Grounding device for electric welding

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TLDR
In this article, a grounding device designed to fit into the weld groove between two adjacent work pieces, such as lengths of pipe, is held in place by having one end anchored under a firm holder in form of a tight band surrounding one of the work pieces and annularly spaced therefrom.
Abstract
A grounding device designed to fit into the weld groove between two adjacent work pieces, such as lengths of pipe, is held in place by having one end anchored under a firm holder in form of a tight band surrounding one of the work pieces and annularly spaced therefrom Contact at the joint is maintained by use of a selectively movable eccentric which can be released to break the contact and for shifting the ground to another location The grounding contacts (a plurality are preferred) is shaped to fit the surface of the welding grove accurately, minimizing resistance at the points of contact and avoiding pitting due to arcing

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References
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Electrical grounding connector

TL;DR: In this paper, a new and useful electrical grounding connector was proposed for enclosing and protecting electrical wires in electrical raceway systems or assemblies, which can be used in connection with wiring raceway system or assemblies.
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Safety live line electrical connector

O'neil Thomas
TL;DR: In this article, electrical connectors designed for use in forming a service connection with a live line are described, and the object of the invention is to obtain a construction which will conform to all of the underwriter's requirements and which is capable of being very quickly attached to any...