Patent FR-2966757-A1 (FR)
Title: Plasma and laser welding torch useful in welding assembly for inducing welding of material by fusion, comprises nozzle having opening for passage of flow of energy inducing fusion of material, energy flow generation system, and torch body
Inventor: MAZOYER PIERRE
IPC: B23K10/02
Filed: 2010-11-02
Abstract: The plasma and laser welding torch (3) comprises a nozzle having an opening for the passage of a flow of energy inducing fusion of material, an energy flow generation system arranged in a torch body (3) so that the flow of energy passes through the opening, a first gas passage equipped in the nozzle around the opening and intended for the flow of a protection gas, a second gas passage for the flow of an active gas allowing centripetal Marangoni effect, and an infusible electrode. The opening opens into a portion of the torch body intended to be arranged with respect to a welding zone. The plasma and laser welding torch (3) comprises a nozzle having an opening for the passage of a flow of energy inducing fusion of material, an energy flow generation system arranged in a torch body (3) so that the flow of energy passes through the opening, a first gas passage equipped in the nozzle around the opening and intended for the flow of a protection gas, a second gas passage for the flow of an active gas allowing centripetal Marangoni effect, and an infusible electrode. The opening opens into a portion of the torch body intended to be arranged with respect to a welding zone (2) and into a housing laid in a cavity formed in the portion of the torch body intended to be laid opposite to the welding zone. The first passage is arranged to allow the formation of a first gas stream for the protection of the welding area, and comprises a set of openings formed in the nozzle around the second gas passage. The second gas passage is arranged in the nozzle so as to allow an active gas supply to the welding zone between the first gas stream and the energy stream, and comprises openings that are formed in the nozzle. The openings of the first and second gas passages are equipped in the nozzle, and are equidistantly arranged in first and second concentric circles, where a diameter of the second circle is less than a diameter of the first circle. The first and second gas passages comprise a common gas inlet to allow single gas supply of the first and second gas passages. An amount of gas passing through the first gas passage is one to three times an amount of gas pas sing through the second gas passage. The torch body comprises a nozzle present in the cavity formed in the portion of the torch body intended to be laid opposite to the welding zone. The infusible electrode is partially placed in the housing of the nozzle and electrically insulated from the nozzle and the torch body, where the housing and the opening define a third gas passage for the inert gas flow. The infusible electrode has an end for generating an electric arc of welding, where the end is fixed in the housing of the nozzle at a distance from the opening. The energy flow generation system comprises a unit for focusing a laser beam of high power at the welding zone through the opening, where the unit is disposed in the torch body. An independent claim is included for a welding assembly.