About HIRATSUKA SADATO
About HORIE HIROSHI
About KOWATA TOSHINORI
About NAKAMURA MITSURU
About HAREYAMA TAKUMI
About resistance welding
About butt welding
About nodular graphite cast iron
About welded joint
About weld zone
About metal structure (microstructure)
About welding heat input
About pearlite
About hardness
About tensile strength
About elongation percentage
About upset welding
About organization
About mechanical property
About strength
About JISFCD400
About Weld zone
About 球状黒鉛鋳鉄
About アプセット溶接
About 組織
About 入熱量