Patent EP-2556914-A1 (EP)
Inventor: MAOCEC CHRISTIAN
IPC: B23K9/32
Filed: 2012-07-18
Abstract: The installation comprises a manual torch for electrical arc welding, a flue gas suction system (10) fluidly connected to the torch by a flue gas suction line (8), and a connection unit. The torch comprises: a torch body (1) comprising a manipulation handle, an electrical control gate and a distance control device (4); a flue gas discharge conduit that passes through the body and is adapted to be fluidly connected to the suction line; and a curved tubular portion that is attached to the body and comprises an internal passage present in fluid communication with the flue gas discharge conduit. The installation comprises a manual torch for electrical arc welding, a flue gas suction system (10) fluidly connected to the torch by a flue gas suction line (8), and a connection unit. The torch comprises: a torch body (1) comprising a manipulation handle, an electrical control gate and a distance control device (4); a flue gas discharge conduit that passes through the body and is adapted to be fluidly connected to the suction line; a curved tubular portion that is attached to the body and comprises an internal passage present in fluid communication with the flue gas discharge conduit passing through the torch body; and a welding nozzle fixed to the curved tubular portion. The connection unit is adapted for electrically connecting a control device to: a gas passage control unit (9) arranged on the suction line and on an additional line fluidly connected to the suction line; and a driving unit (13) of flue gas suction system. The distance control device is adapted to: act on the gas passage control unit arranged on the suction line or the additional line fluidly connected to the suction line so as to vary the flow of flue gas circulating in a part of the suction line, the flue gas discharge conduit and the curved tubular portion; act on the driving unit of the flue gas suction system such that the driving unit acts on a motor of the flue gas suction system so as to vary a rotation speed of the motor and to modulate the suction flow rate of the flue gas suction system; act on the driving unit of the suction system so as to switch on and switch off the suction system; act on the gas passage control unit arranged on the suction line or the additional line fluidly connected to the suction line such that the gas passage control unit is close off the line on which the gas passage control unit reduces the suction flow rate. The flue gas suction system is a motorized turbine. The gas passage control unit comprises a register or a closing valve. The curved tubular portion comprises a first internal pipe coming to be connected to a second internal pipe of the torch body. The first and second internal pipes are arranged to convey a welding wire and a shielding gas. The torch body is further connected to a welding current generator and/or to a wire feeder having a coil wire by an electrical connection and/or connected to a gas welding source by a fluid connection. The electrical and fluid connections are assembled together in a bundle of cables and ducts. The distance control device is electrically connected to the welding current generator or the wire feeder. The additional line is fluidly connected to the suction line by a downstream end and fluidly connected to the ambient atmosphere by an upstream end. The connection unit comprises electrical cables. The driving unit comprises a frequency converter that supplies an electrical current of the motor. The distance control device comprises a push button, a step switch or a potentiometer actuated by the operator. Independent claims are included for: (1) a torch for electrical arc welding; and (2) a process for electrical arc welding.