components it is to be understood that components 4 6 can be plates bars or thick cylindrical shells it is to be noted that the height of the patterns 8 10 will be determined by the material ductility the initial microstructure and the degree of local plastic strain needed for a quality bond micro asperities within components 4 6 are the source of voids which are aligned essentially along a bond plane a purposely machined roughened surface is used in a way to control and enhance the local plastic deformation at elevated temperatures in order to eliminate these voids in addition more surface is made available by this process and dynamic grain growth would occur in both longitudinal and transverse directions at elevated temperatures again the material near the center of the components to be welded experiences essential local flow and rearrangement whereas by conventional processing the surface material in this region has little or no displacement which results in a stagnation zone with a plane of weakness during the operation of joining system 2 fig2 a and 2b components 4 and 6 are machined by conventional machining techniques with surface patterns 8 and 10 respectively components 4 and 6 can either be constructed of similar or dissimilar.