| 摘要 |
PROBLEM TO BE SOLVED: To provide a welding apparatus which can carry out a further more high quality and high efficiency welding operation by performing a low heat input welding than before in butt welding of thick steel plates. SOLUTION: The welding apparatus for carrying out the butt welding of a pair of materials, which are arranged so as to be opposed to each other in a nearly vertical posture and so as to form an I-shaped groove, comprises a welding torch, a wire supplying means for supplying a welding wire to the welding torch at a specified feed speed, an elevating means for elevating the welding torch along the I-shaped groove, a welding electric power source for supplying a specified welding current to the welding torch, and a control means for successively carrying out the build-up welding of the I-shaped groove from below upward by synchronously controlling the wire supplying means, the elevating means, and the welding electric power source, wherein the control means adopts such a means that the welding wire is inserted into the I-shaped groove from the side thereof, and the tip end of the welding wire is reciprocated between the innermost portion and the outermost portion of the I-shaped groove. COPYRIGHT: (C)2007,JPO&INPIT
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