FLASH-BUTT WELDING OF THICK-WALLED PIPES FROM HIGH-STRENGTH STEELS OF K56 STRENGTH CLASS

摘要

Technology was developed for flash-butt welding of 1219 mm diameter pipes with 27 mm wall thickness from 10G2FB steel of strength class K56, designed for construction of off-shore gas pipelines. Admissible limits of variation of the main welding parameters ensuring the required quality of welded joints were determined. Required level of mechanical properties of the joints is achieved by local postweld high-temperature heat treatment in combination with accelerated cooling.