| 摘要 |
PROBLEM TO BE SOLVED: To provide a flux cored wire provided with high precision arc stability, excellent bead shape and high toughness, in gas shielded arc welding using Ar-CO2 based mixed gas. SOLUTION: A wire composed of a steel outer skin 1 seamed by welding is packed with flux 2 that satisfies the following conditions; namely, TiO2 , SiO2 , ZrO2 , Al2 , O3 , and NA2 O+K2 O in which weight % is specified against the total weight of a wire, slag agent composed of metal fluoride and arc stabilizer, alloy agent composed of C, Si, Mn and Mg and metal deoxidizer, and 2% or more of Fe; in addition, the segregation ratio (PFe ) of iron is made 10% of less in the cross section of a wire by quartering prescribed in the formula below. Segregation ratio of iron: PFe (%)=Max.AFe -Min.AFe , in which Max.AFe is the maximum area ratio of iron occupying a quadri sected wire cross section while Min.AFe is the minimum area ratio. |
