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Title: A Critical Review Of The Electrofusion Joining Process
Author: K. G. Toll, J. L. Husted, J. J. Scanlon
Source: American Gas Association 1987
Year Published: 1987
Abstract: While the electrofusion process provide the gas engineer with a simple, reliable field joining method, the fusion process is complex and requires careful control of the key variables (time, temperature, and pressure) through fitting design and energy input control. Based on actual laboratory measurement of temperature and pressure in the fusion melt zone of 4-inch coupling joints, the paper describes the key conditions that relate to the melt fusion process under conditions of melt containment. Plots of pressure and temperature in the melt zone vs. time and energy input are included as well as a heat energy balance estimate. The paper also reviews the role of field procedures, performance testing, and future development in providing a reliable joining system for low installed-cost installation of PE gas distribution systems.

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