Welding torch with a neck comprising an insulated conduit

摘要

The welding torch (1) comprises a protective gas supply, a torch terminal block (2), a torch neck (3) connected to one end of the torch terminal block, a torch head (4) provided at the other end of the torch neck, where the torch neck has an inner tube, an outer tube (5) and an insulating tube, and an insulating body, through which the inner tube guides into the torch terminal block, provided in the torch terminal block. The inner tube has structures forming gas guiding channels at its side turned towards the outer tube and/or the insulating tube has structures forming gas guiding channels. The welding torch (1) comprises a protective gas supply, a torch terminal block (2), a torch neck (3) connected to one end of the torch terminal block, a torch head (4) provided at the other end of the torch neck, where the torch neck has an inner tube, an outer tube (5) and an insulating tube, and an insulating body, through which the inner tube guides into the torch terminal block, provided in the torch terminal block. The inner tube has structures forming gas guiding channels at its side turned towards the outer tube and/or the insulating tube has structures forming gas guiding channels at its side turned towards the inner tube and the inner tube has recesses formed as gas guiding channels. The insulating body has an internal thread at its side turned away from the torch neck for engaging into an external thread formed to the inner tube. A liquid sealing is provided between the internal thread of the insulating body and the external thread of the inner tube. The insulating body has an arrester or a stop for the insulating tube, is formed by the insulating tube and a polygonal axial cross-section. The torch terminal block is formed as insulating body. A mechanical fixed connection is provided between the torch terminal block and the outer tube of the torch neck, and is a metallic welding connection, a soldering connection, an adhesive connection or a screw connection. A torch head stop is provided in the torch head for the insulating tube. The insulating body is sealed towards the torch terminal block by the liquid sealing or O-ring. The gas guiding channels are present in an area nearer to the torch terminal block, are formed by grooves axially running into the inner tube and/or in the insulating tube, and are formed by holes radially running into the inner tube. The gas guiding channels are formed by a thread-like structure running to the outer side of the inner tube. Each gas guiding channels is arranged to the other gas guiding channel. The insulating tube is made of glass fiber mesh.