| 摘要 |
PURPOSE:To prevent thermal influence to a flux by the cavity formed in the part right under the weld line and to obtain a flux cored wire having good quality by depressing the central part of the surface of the flux packed in a curved hoop in the longitudinal direction thereof prior to seam welding. CONSTITUTION:The crest-shaped surface of a flux 4 charged onto a U-shaped hoop 3 is pushed by a shaping jig 8 to form a trough 9. The hoop 3 is then curved by squeezing rolls and is seam-welded along the longitudinal direction thereof. The shaping of the peak surface of the flux 4 in this case may be accomplished by using a block-shaped shaping jig 8 or a roller-shaped shaping jig 8 or feeding forcibly a gas such as Ar or CO2, etc. and shaping the peak part. Any means is usable as far as such can shape the peak of the flux to a hollow line. |
