| 摘要 |
PURPOSE:To execute satisfactory three o'clock welding without weld defects by injecting an inert gas toward the lower part of the molten pool of weld beads and executing multi-layer building-up while preventing the sagging of the beads. CONSTITUTION:A welding torch 5 and a gas nozzle 6 are directed from a three o'clock position to a groove 1 in a horizontal direction formed of upper and lower vertical plates 3, 4. A welding wire 7 is led together with a shielding gas out of the top end of the welding torch 5 to form the molten pool 8 in the groove. An inert gas such as Ar similar to the shielding gas is injected at 5Nl/min flow rate from the gas nozzle 6 toward the lower part of the molten pool 8. As a result, the sagging of the molten pool like a dotted line shown in the figure is prevented and since the molten pool is formed to a concave shape, the lack of fusion and slag inclusion are eliminated and the satisfactory three o'clock welding is executed.
|
