| 摘要 |
<p>Two or more arms are mounted in a rotary array on a central pillar, each arm carrying a differently profiled welding plate, where the heating circuit can be switched on or off under operator control. - This provides a variety of welding zones to join the sections of plastic window and door frames with a 45 degrees angle for corners or adjacent zones of 90 degrees to give a T shaped butt weld.</p> |
