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Changes of the microstructure of the interface in intensification of the explosion welding conditions for the copper – cupronickel alloy, simulating the copper–copper homogeneous pair are investigated. Typical wavy structures were produced at the interface. The results were compared with the special features of the relief of joints such as Cu–Ta, Cu–Ti and titanium–orthorhombic titanium aluminide. Heterogeneities were found at the interface: projections, local melting zones, groups of projections, leading to imperfect interfaces, branching of the interface, intersection and convergence of the bands. A quasi-wave surface was found in the vicinity of the flat interface (slightly above it) which contains sections of bands and almost circular islands, away from the bands. Large unfinished rotated areas (macro-rotations) were found in the solid phase. [ABSTRACT FROM AUTHOR]