WELDING METHOD FOR SUPERPOSED PART

PURPOSE:To form a welded zone excellent in strength with excellent workability at the time of welding plural metal plate members by fitting a cutting means and a welding means of metal plates at a prescribed interval on a wrist of a robot and cutting the metal plates to form a bevel by the movement of the robot and continuously, welding the bevel by the welding means. CONSTITUTION:A plasma arc cutting torch 3 as the cutting means and a welding torch 4 as the welding means are fitted at the prescribed interval on the wrist 2 of the robot 1. A groove 7 as the bevel is then subjected to build-up welding by the welding torch 4 to move by following the cutting torch 3 while forming the prescribed groove 7 as the bevel at the time of welding on the metal plate members 5 and 6 by the cutting torch 3 by playing back the robot 1. High strength welding is performed with excellent workability on the optional position of a superposed part of the plural metal plate members.