METHOD OF ARC WELDING WITH REVERSE SIDE COOLING FOR OBTAINING HIGHLY TOUGH LARGE-DIAMETER ED STEEL PIPES

摘要

Method of arc welding with reverse side cooling for obtaining highly tough large-diameter welded steel pipes There is disclosed a novel arc welding method for manufacture of a welded steel pipe wherein the edges of a steel plate bent into a pipe are welded together on one side for forming a pipe and then the seam line of the thus formed pipe is welded by second welding 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.