The purpose of this study was to determine the feasibility of the Hyde welding process and its effect upon the structures of 1020 and 1045 steel, with a view toward adoption of the process for engine cylinder construction. The welding action of this process is satisfactory as regards formation of a uniform bond and effect upon the structure of the steel. As compared to other methods of joining steel for high strength, such as torch and arc welding or torch brazing, the Hyde process has some distinct advantages, among which are (a) Absence of local overheating. (b) More uniform joint. (c) Freedom from warpage due to localized heating or nonuniform cooling.