| 摘要 |
At least one of the two contacting metal areas to be welded are in the form of void-containing disseminated units, such as a bundle of wires, the strands of a wire mesh, the fibres of a metallic fibre mat, or the component elements of a metal foam or sponge. This ensure that the necessary vibration can take place whereby frictional engagement at a multiplicity of points gives rise to heat and fusion with good mechanical and electrical connection. In one example (Fig. 1a) a bundle of wires (3) has a flattened contact area (4) of separated wires ultrasonically welded to a prepared electrode (1). In another example (Fig. 2b) a metal tab (10) is ultrasonically welded to a compressed zone (8) of a fibrous mat electrode (7) utilizing additionally a wire mesh element (9) whose area corresponds to that of the compressed zone (8). The electrode (7) may be a nickel fibre mat. <IMAGE> |
