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Cable splice investigation points to improve flexibility.
Coal Age 1977 Mar; 82(3):101-102
Soldered, brazed, and thermit-welded splices, contained in test sections of coal mine shuttle car trailing cable, were flexed to failure on a laboratory apparatus. The fractured joints were analyzed by visual and microscopic observation to determine the modes of fracture. Fractures occurred normally in the copper wires adjacent to the welds. In a few cases misalinement of the ground conductor resulted in premature failure remote from the welds. The copper at the brazed and welded joints had a coarse, recrystallized structure; that in the soldered joints did not. Scanning electron microscopy showed 50 to 75 percent of the individual wire fractures to be fatigue failures. Fatigue experiments showed a higher fatigue life in the fine-grained wire than in the coarse-grained wire. These results indicated the need for a solder or braze of adequate strength which would not recrystallize the wire. Low-melting-point zinc-based solder joints were prepared which met these requirements.
Mining-industry; Underground-mining; Coal-mining; Cables
OP; Journal Article
Issue of Publication
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division