Device, useful for welding an electric arc, comprises a contact tube that is passed through a welding wire and is adapted for supplying the wire with electric current, and a guiding piece, where the welding wire has a protruding portion

摘要

The device comprises a contact tube (2) that is passed through a welding wire (3) and is adapted for supplying the welding wire with electric current, and a guiding piece (8). The welding wire has a protruding portion (4) that leaves the contact tube and is designed to be located next to parts (5) to be welded. The guiding piece is configured for guiding the protruding portion of the welding wire, comprises a guiding tube penetrated by the welding wire, and is made of electrically insulating material and ceramic. The guiding tube is connected to the contact tube. The device comprises a contact tube (2) that is passed through a welding wire (3) and is adapted for supplying the welding wire with electric current, and a guiding piece (8). The welding wire has a protruding portion (4) that leaves the contact tube and is designed to be located next to parts (5) to be welded. The guiding piece is configured for guiding the protruding portion of the welding wire, comprises a guiding tube penetrated by the welding wire, and is made of electrically insulating material and ceramic. The guiding tube is connected to the contact tube. The guiding tube and the contact tube are coaxial. The welding wire passes through the contact tube along a longitudinal channel having a first section and through the guiding tube along the longitudinal channel having a second section that is equal to the first section. The protruding portion of the welding wire has a length of 20-40 mm. The guiding piece and the protruding portion are configured for leaving a free working portion of the welding wire beyond a free end of the guiding piece. The working portion has a length of 15-20 mm. A gas nozzle (10) is arranged around the guiding piece of the welding wire. An independent claim is included for a process for welding an electric arc.