| 摘要 |
PURPOSE:To weld satisfactorily the side wall in the groove part of objects to be welded vertically and a molten metal by oscillating an arc at a right angle to the weld line, and blowing a shielding gas to the front and rear sides of the arc in the welding direction from the centerline of the groove toward the lower side. CONSTITUTION:A welding wire 6 is fed and an arc 6 is generated between the wire 5 and objects 5 to be welded and while the arc 6 is maintained at a right angle to the weld line, the arc is moved in an arrow W direction to weld successively the groove in the three o'clock position. The tips of shielding gas nozzles 1, 2 provided on the front and rear sides of the arc 6 in the welding direction are inclined downward at a prescribed angle. A welding pool 7 is then forced upward by the nozzle 1 to trim the sectional shape and the advancing of the pool 7 adhead the arc 6 is prevented by the nozzle 2. The nozzles 1, 2 are provided within about 10mm. backward of the wire 5 and the groove between the objects 8 is kept at about 8-14mm.. |
