| 摘要 |
<p>The leak-tight welding of elongated joints, particularly of circular, interlocked joints, such as, for example, the fluid-tight welding of plugs on drums is achieved by folding over the edge (11), or the circular margins around a circular opening, of the sheet (1) onto which, e.g., a plug (27) or other workpiece is to be welded liquid-tightly, laying the workpiece against the folded-over edge (11), and then applying electrodes (28, 30) on opposite sides of the workpiece and sheet, with sufficient pressure that the folded-over sheet margin (11) is further deformed. In this way, the surface-parts not lying flat against each other at the contact-surface (35/32) of the workpiece and sheet margins are forced into accommodation and an even distribution of pressure along the contact-surface results. When the welding-current is switched on, the current density is essentially uniform throughout the contact-surface and hence a simultaneous welding along the entire contact-surface occurs, producing a a leak-tight joint.</p> |
