| 摘要 |
PURPOSE:To prevent rupture of a steel strip in a weld zone in the stage of welding the trailing end part of the preceding steel strip and the top end part of the succeeding steel strip and passing the strip to a treating line by checking the tensile strength to be exerted on the weld zone. CONSTITUTION:The trailing end part 6 of a preceding steel strip coil and the top end part 7 of a succeeding steel strip coil are set between a stationary base 4, a moving base 3 and welding electrodes 2. While the strips 6, 7 are controlled by an electric power monitor 8, the strips are heated and the base 3 is brought into press contact with the base 4 by means of a hydraulic cylinder 1 controlled by a monitor 9 for the extent of movement, by which the two strips are welded. Weld beads are cut by cutting tools 10, and a hydraulic cylinder 1 is controlled with a tensile force setter 5 to energize the tensile force corresponding to the tension and bending force acting on the steel strip during passage through the treating line on the cylinder 1 in the direction opposite from the direction in the stage of the press contacting and welding to check the presence or absence of the rupture in the weld zone of the steel strip during the passage. |
