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ELECTRETHUSION ACCESSORY HAVING A TUBULAR EXTENSION OF THERMOPLASTIC MATERIAL, AND METHOD OF FORMATION OF A BOARD BETWEEN TWO EXTENSIONS OF METAL PIPING, EACH PROVIDED WITH AN INTERNAL COATING OF THERMOPLASTIC MATERIAL
ELECTRETHUSION ACCESSORY HAVING A TUBULAR EXTENSION OF THERMOPLASTIC MATERIAL, AND METHOD OF FORMATION OF A BOARD BETWEEN TWO EXTENSIONS OF METAL PIPING, EACH PROVIDED WITH AN INTERNAL COATING OF THERMOPLASTIC MATERIAL
Electrofusion fitting having a tubular extension of thermoplastic material, and method of forming a joint between two metal tubing extensions, each provided with an internal coating of thermoplastic material The invention relates to electrofusion fittings. electrical terminals (13) for electrofusion fittings were passed through the space between the ends (1) of adjacent metal tubing extensions, which are subsequently welded. Electrical terminals remain in welded metal as a contaminant that may be detrimental to weld integrity, and the object of the invention is to eliminate this problem. This objective is achieved by an electrofusion fitting construction comprising a tubular extension of thermoplastic material (3) with an outer diameter measurable with the inside diameter of the ends of a compatible thermoplastic material coating of adjacent metal tubing extensions (1), having at each end of the connector at least two heating coils on or near the outer surface of the connector, with electrical terminals extending from the heating coils through the connector to emerge on the inner surface of the tubular extension for connection to a source. of electric power.
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