| 摘要 |
<p>Apparatus and method for spot welding including a pair of opposed electrodes (42, 54) mounted respectively on arms (34, 32) which are mechanically fixed against displacement apart during application of the welding current. One arm (32) includes a pneumatic cylinder (48) with a piston rod (50) for moving an electrode (54) toward and away from the workpieces (12). Brake wedges (80) are moved radially outward against a brake rod (76) contained in the piston rod (50). Apparatus used to equalize pressure from the electrodes during welding includes a spring (22) connected by a threaded rod (24) to a slide bar (26). The slide bar (26) is reciprocally movable between a pair of rails (28) along the top surface (20) of a frame (14).</p> |
