CONTROLLING METHOD FOR WELDING CURRENT OR WELDING ERECTRIC POWER CORRES PONDINGLY TO WELDING SPEAD AND ITS CIRCUIT

摘要

PURPOSE: To control the welding current or the welding electric power according to the welding speed in a welding device performing continuous longitudinal- seam welding to a metallic band plate to be formed into a cylindrical tube. CONSTITUTION: As the control input value of a controller 6 igniting a transistor unit 7 conducting the control of the welding current, a voltage value depending on a speed to be supplied from a rotational speed generator 11, is added to an adjustable fixed voltage value to be supplied from an adjustable power supply.