A good example cable assembly includes: a plurality of conductors in a Litz cable arrangement; a layer of magnet wire insulation over the Litz cable arrangement; an inner silicone dielectric jacket over the layer of magnet wire insulation; and an outer silicone coating across the inner silicone dielectric jacket.
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BACKGROUND
Induction heating of workpieces to be welded, for example pipe, frequently entails arranging a fixture or one or more conductive cables in proximity to the workpiece. Conventional heating conductors may be liquid-cooled or air-cooled. Conventionalair-cooled cables are constructed by pulling cables through sleeves, such as a PyroSleeve sleeve, for both thermal and mechanical protection. Pulling the cables through sleeves is a difficult and labour intensive process which restricts the period of cable jacketinstalled. Conventional cables are built with 150. degree. C. magnet wire insulation, that requires additional thermal protection from the warmth of the area being inductively heated, which can reach temperatures in excess of 150. degree. C. (e.g.,the temperature rating of the insulation of conventional cables). Cable manufacturers are able to extrude silicone insulation for a coat, but silicone insulating material is soft, cuts or rips easily, and does not hold up to abrasion.
There’s a demand for air-cooled induction heating wires that have improved resistance to wear, abrasion, cuts, rips, and warmth.
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