| 摘要 |
<p>A welding tool 10, in particular for TIG arc welding, plasma welding or laser welding, includes means for feeding an inert gas to the head of the tool, and means for confining the protective gas around the welding head 12, the confinement means comprising a skirt 32 prefabricated out of semirigid refractory material and means for releasably fastening the skirt on the welding head. The skirt 32 is shaped at its front portion to surround the weld bead with clearance over a predetermined length. The skirt 32 is preferably made of composite material based on ceramic fibres and an elastomer that withstands high temperatures, and may also include a metal sheet 46 for providing thermal protection. A camera 43 may be provided for observing the welding zone.</p> |
