A Prewelding Pipe-Heating System

Abstract

The computation of the parameters and operating mode of the induction heater for large-diameter pipes for preventing thermal stresses in welding is considered. Thermal processes at various ambient temperatures and with an arc moving along the welded butt combined are analyzed. Increased accuracy of the computations is provided using the nonlinear thermal task model taking into account phase transitions. The proposed split-face inductor design provides convenient installation and high reliability. The inductor’s selected frequency and power make it possible to solve the problem of matching with the power source without any transformer. The inductor design includes a ferrite-magnet wire, which has made it possible to use double-section loop winding.