Experimental investigations of the high-strength steel welded samples

Abstract

The subject of the research, results of which are presented in this paper, was experimental investigation of welded samples of the high strength steel S690 QL. In order to establish the optimal welding procedure, one has to check and/or verify different parameters of the chosen technology. That includes verifying the chemical composition of the delivered base metal, determining its weldability, deciding on the type of eventual heat treatment(s) and then checking that the executed welded joints possess the required mechanical and metallurgical properties. This paper reports results from only a part of the performed tests the tensile test for establishing the mechanical properties, the Charpy impact toughness test and the weldability verification by the TTT diagrams of samples welded by the two different welding technologies.