ABSTRACT
A new approach to describing the formation of welded joints was proposed on the basis of the study of copper-tantalum welded joints. Three-layer composites were obtained as follows: first, copper—titanium was welded, and the two-layer composite was welded with copper. The vortices are imperfect compared with those observed for titanium–orthorhombic titanium aluminide welded joints. The surveys were made from the surfaces of thin sections of longitudinal section samples obtained by removing copper layers with abrasive paper until traces of titanium appear. Depending on the melting point of the starting materials, the temperature of formation of intermetallic compounds, the surface energy of the intermetallic–metal, the occurrence of continuous or almost continuous significant volumes of the intermetallic phase can occur under less severe conditions. Since the process leading to the adhesion of particles is fairly general, for various welding conditions and different conditions of subsequent operation there is always the possibility of destruction of the joints due to fragility of intermetallic phases.
