Process for performing a synchronous welding process with a final welding device for a 2-step welding process

摘要

Method for carrying out a synchronized welding process with a final welding device for a 2-step welding process of spiral seam steel pipes, comprising: a fixed drive device (3), an external welding device (2), an internal welding device (8) and a movable drive device (1), wherein the movable drive device (1) is mounted on an electric slide rail (4) for the axial movement of the movable drive device (1) and moves on this as a whole in the axial direction, and that the outer welding device (2) on an electric slide rail (7) for the Axial movement of the outer welding device (2) is mounted and moves on this as a whole in the axial direction, characterized in that the method comprises: axially moving the movable drive device (1) on the electric slide rail (4) for the axial movement of the movable drive device ( 1) before the start of the welding process angs so as to bring a drive roller (11) on the movable drive device (1) into contact with the steel pipe while avoiding a weld seam, and preventing the movable drive device (1) from interfering with the external welding device (2); Moving the outer welding device (2) on the electric slide rail (7) for the axial movement of the outer welding device (2), so as to move the welding torches of the outer welding device (2) into a weld seam position, the weld seam position in which the welding torches of the inner welding device (8 ) are located, and the weld seam position in which the welding torches of the external welding device (2) are located differ from one another by a pitch and a half; and driving the steel pipe by the drive roller on the fixed drive device (3) and by the drive roller (11) on the movable drive device (1) to perform 1.5-pitch synchronous welding.