Abstract
Technique for determining technological parameters of electrofusion welding of polyethylene pipes at ambient temperatures below standard, based on analysis of temperature field dynamics in heat-affected zone, is proposed. Mathematical model of thermal welding process used in calculations is presented, considering temperature dependence of phase transformation heat and crystallinity degree of polymer material. Results of determining parameters for electrofusion welding of polyethylene pipes and welding of branch saddle topload to polyethylene pipe are presented. Effectiveness of calculated determination of welding parameters is confirmed by tests of welded joints made according to proposed welding technology at naturally low temperatures.
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