AUTOMATIC CONTROLLING METHOD OF FORGE WELDING TEMPERATURE OF FORGE-WELDED STEEL PIPE

摘要

PURPOSE:To manufacture a product which is satisfactory in a quality of a butt welding part, by measuring a temperature of a pipe-like skelp edge part before forge welding, and adjusting an output of a heating coil so that a temperature of both edge parts becomes within a target range. CONSTITUTION:A control device 11 inputs and operates a signal from a forge welding thermometer 7 and a signal from a skelp thermometer 9, and sends a control signal to a thyristor voltage regulator 14. A voltage level is controlled by the thyristor voltage regulator 14, a high frequency current is generated by a high frequency oscillator 13, thereby a current flowing to a high frequency induction heating coil 6 is controlled. Also, a control signal is sent to a left and right adjusting device 15 for adjusting the left and right position of the high frequency induction heating coil 6, and the left and right position of the high frequency induction heating coil 6 forming one body structure with a transformer 12 is controlled.