| 摘要 |
PURPOSE:To provide excellent welding by making uniform weld bead over the whole circumference and the upper and lower bead shapes same when executing the welding of the edge of thin large plates in the horizontal position without using a filler metal. CONSTITUTION:Plates 1,2 having edge parts 1a,2a which are stepped to center parts 1c,2c are placed opposite to each other to make the edge parts 1a,2a abutted on each other, and the width B of the edge parts 1a,2a is set so that the base materials of the edge parts 1a,2a may be sufficiently melted by the welding heat input, and may have the volume equivalent to the amount of the molten metal to form the desired bead 3. The shape of the groove and the position are recognized by a shape recognizing sensor 10 in executing the horizontal position welding of the edge parts 1a,2a without using a filler metal, and a welding electrode 6 is set to the constant prescribed position. The welding electrode 6 is set to slightly upward of the center of the groove in the vertical direction. |
