| 摘要 |
PURPOSE:To improve the drawability and weldability of a wire by granulating the flux for filling to a steel tube so that the ratio of the length to the breadth becomes within the specified ratio in wet state and by prevending the defect generation at the steel tube drawing time by unifying the filling rate of the flux in the steel tube longitudinal direction. CONSTITUTION:The steel pipe filling flux of the flux cored wire for welding is granulated so that the ratio of the length to the breadth becomes within 1-4 in its wet state. The unevenness in filling of the generation of a void, etc. is prevented in case of the flux inside the steel tube being uniformly filled for the longitudinal direction of the steel pipe and the steel tube being worked in the prescribed wire with its drawing. The disconnection during the wire drawing due to the constraint of the flux is therefore prevented and the defect generation of a pin hole, etc. due to the gas blow in the inner part cavity can be prevented as well.
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