| 摘要 |
PROBLEM TO BE SOLVED: To provide such a hot-rolled wire that the feedability is improved and the generation of spatter is decreased without adding any process in a manufacturing process of a solid wire used for an arc welding. SOLUTION: The hot rolled wire for the solid wire used for the arc welding is characterized by that the diameter of the hot rolled wire is 3 to 6 mm, the depth of the intercrystalline oxidation is 3 to <12μm, and further dG/εis in the range of 1.3 to <4.5, where dGμm stands for the depth of intercrystalline oxidation of the hot rolled wire,ε(ε=2×ln(d0/d)) stands for the real strain occurring in a working process where the diameter of the hot rolled wire is reduced to the diameter of the solid wire, d0 mm stands for the diameter of the hot rolled wire, and d mm stands for the diameter of the solid wire. The method for manufacturing the hot rolled wire for the solid wire used for the arc welding is characterized by that the heating index HI which is derived from the heating history after rolling the wire and calculated by the equation shown below is controlled in the range from 700 to 4000. HI=1/2×(maximum temperature of wire deg.C-600)×holding time (min) under 600 deg.C or higher.
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