Patent FR-2987295-A1 (FR)
Title: Welding torch, useful as e.g. plasma type welding torch, comprises deflecting unit arranged to guide and deflect flow of active gas from second opening and to guide flow of active gas so that active gas converges at base of first opening
Inventor: MAZOYER PIERRE
IPC: B23K9/167
Filed: 2012-02-29
Abstract: The welding torch comprises a unit for generation of a flow of energy, a first channel centrally emerging by a first opening (88) arranged to face opposite of a part to be welded for the passage of the energy flow, a second channel (58) laterally emerging by a second opening, provided for the flow of an active gas flow, a deflecting unit arranged to guide and deflect the flow of active gas from the second opening and to guide the flow of active gas so that the active gas converges at a base of the first opening, and a body equipped with a housing and the second channel. The welding torch comprises a unit for generation of a flow of energy, a first channel centrally emerging by a first opening (88) arranged to face opposite of a part to be welded for the passage of the energy flow, a second channel (58) laterally emerging by a second opening, provided for the flow of an active gas flow, a deflecting unit arranged to guide and deflect the flow of active gas from the second opening and to guide the flow of active gas so that the active gas converges at a base of the first opening, a body equipped with a housing and the second channel, and a conduit that is laid out in the housing and provided with the first channel, where the first channel is envisaged for the flow of an inert gas flow. The unit for generation of energy includes an electrode (90) presenting an infusible free end (94) laid out in the first channel of the conduit in withdrawal compared to the first opening. The conduit includes an end portion arranged to be turned compared to the part to be welded. The end portion is formed to guide the active gas so that the active gas converges at the base of the first opening. The deflecting unit is arranged to deviate the active gas from the second opening in a direction of the end portion from the conduit. The end portion is present in a truncated cone in an outside. The conduit extends according to an axis. The outside of the end portion forms an angle of higher than 45[deg] compared to the axis of the conduit. The torch further comprises a shield equipped with a facing and arranged on the body so that the facing is turned compared to the body and centered with the first opening, and delimits with the body. An annulus is arranged to collect the active gas from the second opening and to distribute the active gas around the first opening. The torch is conceived to be moved in a direction and a direction parallel to the part to be welded. The body is equipped with a third channel provided for the flow of an inert gas flow. The third channel emerging by a third opening (98) is arranged to be turned compared to the part to be welded and laid out behind the first and second openings in a direction of given displacement. The unit for generation of energy includes a laser source to generate a laser beam and a unit for focusing the laser beam so that the laser beam passes the first channel. Independent claims are included for: (1) a welding assembly; and (2) a process for welding by a torch.