Keyword: «preheating»

The paper studies the evolution of the thermal process during electrofusion welding of polyethylene pipes at low ambient temperatures. It is proposed to preheat the pipe assembly with a coupling by means of a built-in heater mounted in the body of the connecting part. To obtain a temperature distribution close to uniform in the heat-affected zone, alignment is carried out. The duration of heating and leveling are determined by calculation. It is proposed to control the cooling process using a built-in heater. The power of the embedded heater with controlled cooling is determined by the solution of the inverse problem of controlling the thermal regime of the technological process.