1922   Metal type FCW、 Tube type

1941   Arcos Wire (φ3.2,4.0)、Arcos type Cross Section　

1967　To Small dia. （⇒φ2.4）、Heart shape Cross Section　

1972　To Big dia. （⇒φ4.8）、Arcos type Cross Section　

1974～　To Small dia. （⇒φ2.0）、Heart shape Cross Section　

          （⇒φ1,6,1.2,0.9）、O shape Cross Section　

1975　To Big dia. （⇒φ6.0,8.0）、O type Cross Section　for Steel Making

1977   Development, Practical application of φ2.0 FCW for Stainless Steel CO2 welding

         by Nippon Welding Rod, Heart shape Cross Section　

1977～　To Small dia. （⇒1.6、1.2 and φ0.9）for Stainless Steel CO2 welding、O type Cross Section

1978　Improvement of Qualities Pat.s of FCW by Sumikin Welding Industries

             Multiple Flux Feeding System in Manufacturing Machine

            High Temperature Treatment of Natural Rock Powder for Inner Ingredient of FCW

1984　 To Big dia. （⇒φ12.5、13.0）、O type Cross Section　for Steel Making

1984　 To Big dia. of Cu FCW（⇒φ6.0）、O type Cross Section　for Cupper Alloy Making

1985    Ni base Alloy FCW （φ1.2）　Ｏ type Cross Section

1985    Metal　type FCW （MCW φ1.2）　Ｏ type Cross Section

1986    Improvement of Seam Shape of φ13 FCW for Steel Making　Ｏ type Cross Section

2001   Development of Bi free type FCW （φ1.2）for Welding　Ｏ type Cross Section

2008   Development of Multi-layer type FCW by Nippon Welding Rod