| 摘要 |
PURPOSE:To prevent the deterioration in the quality of a thick steel plate by inserting the welding head having nonconsumable electrode and filler wire inside a groove, then by weaving the nonconsumable electrode in the horizontal direction with ascending the welding head. CONSTITUTION:A welding head 3 is inserted into the groove 2 of a thick steel plate 1 by arranging it so that the beveling face 2a becomes in the vertical direction. The head 3 is made its weaving possible in full width of the beveling face 2a by providing an nonconsumable electrode 6 and filler wire 7 inside the recessed part 5. Moreover, the wire 7 is fed by continuing inside the recessed part 5 through a feeding pipe 9. The welding of the thick plate 1 is performed by weaving the electrode 6 in the horizontal direction with ascending the welding head 3 along the beveling face 2a. Due to the bead 10 being able to be laminated with small heat input the material deterioration of the thick plate 1 at the welding time is prevented.
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