| 摘要 |
<p>The present invention is a tungsten inert gas or similar welding torch (2) which is readily adjustable in length for different welding situations. The torch has a relatively conventional head (4) with a heat shield (26) attached at the lower end. The heat shield (26) serves as a resilient telescopic mounting for the gas cup (24) which surrounds the electrode (20). It further serves to give thermal and mechanical isolation between the torch head (4) and gas cup (24). A gas diffusion screen pack (32) is located within and bears against an inner circumference of the gas cup (24) to provide resilient support and center the cup about the longitudinal axis of the electrode (20). The gas cup (24) may be extended or retracted a limited distance within the heat shield (26) and may also be rotated if desired. Alternatively, longer or shorter electrode collet bodies (30, 70, 84) can be screwed into the head to provide almost unlimited adjustment of torch length. A gas cup (24, 68, 82) of appropriate length is used with each collet body (30, 70, 84).</p> |
