Author(s)

H. Bugłacki

Abstract

Heat treatment influence on HV^^ hardness of welded joints in offshore constructions H. Bugiacki Faculty of Ocean Engineering & Ship Technology Technical University of Gdansk, Poland Abstract The work presents the results of measurements of Hl'max hardness of butt welded joints for thermally improved 18G2A and 18G2AV steel plates before and after heat treatment 580°C/1 hour/25mm of joint thickness with cooling in air. 1 Introduction For offshore constructions plates are used that are either quenched and tempered or obtained as a result of thermo-mechanically controlled rolling process, with the end of rolling temperature below that of austcnite rccrystallization [1-3]. At the same time the rules of classification societies and norms [2,4] for offshore constructions require heat treatment after welding 600_+20"C/1 hour/25mm of thickness with cooling in air of plates g=50mm thick, placed in the area of water spindrift, and joints gf=63mm thick in the underwater part of offshore

Keywords