| 摘要 |
PURPOSE:To form a sound welding bead by welding with directing welding torch to both welding proceeding and its opposite directions, gradually moving to the welding proceeding direction and stopping welding arc after welded with directing the welding torch between a backing and weld zone until the oval shape of crater becomes semicircle. CONSTITUTION:After completing joint welding from the leg part to belly part of facing rails 1, 1 with arranging groove, the enclosed arc multi layer welding of the head part of the rail 1 is executed with butting a backing 2 along the contour shape of head side of the rail 1. The arc of covered electrode 4 is directed to the opposite direction of the welding proceeding direction to weld, moving to the crater part in melted state generated near bead's end, moving in the welding proceeding direction, welding until the oval shape of crater becomes semicircle with butting welding arc between the weld zone and backing and then stopping the welding arc. This welding method is repeated for each layer to weld the head part of the rail 1. |
