| 摘要 |
PURPOSE:To reduce the contamination of slag in molten metal and the micro segregation in the molten metal by forming a cross sectional shape of a hallow part to the shape to satisfy a formula to shorten the extension of a flux column. CONSTITUTION:An inscribed circle 4 with the maximum diameter to touch internally the periphery 3 of the hollow part 2 formed by the sheath 1 is described and this radius is denoted by R. The distance from the center O of this circle 4 to a point A on the farthermost periphery 3 is denoted by L and the cross-sectional shape of the hollow part 2 is determined so that L/R is made to >=1.1. SPCC material is used as the sheath and wires with various hollow part cross-sectional shapes are manufactured and the welding is performed under prescribed welding conditions. By this method, the extension of the flux column is shortened and the contamination of the slag and the micro segregation are also reduced. |
