Application of high strength steels to responsible welded structures on motor vehicles

Abstract

For considered vehicle several very responsible assemblies are made, and the aim of this paper is to propose welding technology which will ensure obtaining reliable welds. In paper is estimated the weldability of high strength steel on which number of factors have influence. Some of them are chemical composition of the base metal (BM), type of filler material (FM) and welding method, amount of diffusible hydrogen from weld metal into base metal, thickness, type and positions of welds, heat input, type of applied heat treatment, sequence of welding, etc. The optimal welding parameters are based on the results obtained from the mechanical tests performed at room as well as at elevated temperatures, visual inspection of joint and measured hardness and metallographic examinations of some zones of welded joints, and special with regards on results obtained for impact toughness.