| 摘要 |
<p>In high frequency welding apparatus in which high frequency electrical heating current is supplied to metal surfaces (10, 11; 42-49;52, 54) to be welded together by contacts engaging the metal which is advanced toward a weld point (1; 1a-f), the contacts (8-9; 25-26) engage the metal in advance of the weld point (1; 1a-f) and have contact faces with downstream edges (12-30) contacting the metal. The downstream edge of one of the contacts (8 or 9 or 25 or 26), or the downstream edges of the both of the contacts (8-9; 25-26), is or are skewed with respect to the path or paths of the metal surfaces (10-11; 42-49; 52-54) to be heated so that the downstream edge (12 or 13) or edges (12-13) extend at an acute angle of about 35° to about 55° with respect to the path or paths of the metal surface or surfaces (10-11; 42-49; 52-54), the angle being intermediate the contacts (8-9; 25-26) and the weld points (1; 1a-f).</p> |
