Nippon Kokan Kabushiki Kaisha

Yukio Nishino

Tadaaki Taira

Kiyoteru Hirabayashi

Tetsuo Yamaguchi

An arc welding method for manufacture of a welded steel pipe wherein the edges of a steel plate bent into a pipe shape are welded together on one side for forming a pipe and then the seam line of the thus formed pipe is welded by a second welding operation at the side opposite to the side where the first welding was performed. During such second welding, the weld is cooled forcedly from the side where the first welding was performed. Such forced cooling compensates for any physical effects accompanying the welding and imparts elevated toughness to both the weld metal and the heat affected zone.

Growing community of inventors

Fukuyama, Japan

Yukio Nishino