An arc-welding installation comprising a manual electrical arc-welding torch and a flue gas suction system fluidically connected to said welding torch by a flue gas suction line, wherein said torch comprises: - a torch body comprising a manipulation handle, an electrical control gate and a remote control device; - a flue gas discharge conduit that passes through the torch body and is suitable for fluidic connection to the flue gas suction line; - an angled tubular portion that is fixed to said torch body and comprises an internal passage in fluidic communication with the flue gas discharge conduit passing through the torch body, and - a welding nozzle fixed to said angled tubular portion, - connection means suitable and designed for electrical connection of the remote control device of the torch: • to gas passage control means arranged on the suction line or on an additional line fluidically connected to said suction line; and • to management means of the flue gas suction system, characterised in that the remote control device is suitable and designed, when actuated by the operator: - for acting on the gas passage control means arranged on the suction line or on an additional line fluidically connected to said suction line so as to vary the flow of suctioned flue gas circulating in at least part of said suction line, in the flue gas discharge conduit and in the angled tubular portion of the torch, and - for acting on the management means of the flue gas suction system such that the management means act on a motor of said flue gas suction system so as to vary the rotation speed of said motor and to modulate the suction flow rate of the flue gas suction system. - a torch body comprising a manipulation handle, an electrical control gate and a remote control device; - a flue gas discharge conduit that passes through the torch body and is suitable for fluidic connection to the flue gas suction line; - an angled tubular portion that is fixed to said torch body and comprises an internal passage in fluidic communication with the flue gas discharge conduit passing through the torch body, and - a welding nozzle fixed to said angled tubular portion, - connection means suitable and designed for electrical connection of the remote control device of the torch: • to gas passage control means arranged on the suction line or on an additional line fluidically connected to said suction line; and • to management means of the flue gas suction system, characterised in that the remote control device is suitable and designed, when actuated by the operator: • to gas passage control means arranged on the suction line or on an additional line fluidically connected to said suction line; and • to management means of the flue gas suction system, - for acting on the gas passage control means arranged on the suction line or on an additional line fluidically connected to said suction line so as to vary the flow of suctioned flue gas circulating in at least part of said suction line, in the flue gas discharge conduit and in the angled tubular portion of the torch, and - for acting on the management means of the flue gas suction system such that the management means act on a motor of said flue gas suction system so as to vary the rotation speed of said motor and to modulate the suction flow rate of the flue gas suction system.