Keyword: «high-strength pipe steel»

The paper studies welded joints of high-strength pipe steels in twin-arc automatic welding in a shielding gas. The microstructure, transverse and longitudinal macro- and microhardness distribution in various zones of welded joints are studied. Mechanical tests for static tension and impact toughness at low temperatures are carried out. The causes of heterogeneity and the degree of softening in the heat-affected zone are established. The principles of reducing microstructural and mechanical heterogeneity are formulated.