1. A device for combined laser-arc welding, comprising a laser unit for producing a laser beam at a selected laser beam power, a manual welding torch for producing an electric arc at a selected electric arc power, a first energy supply unit for supplying energy to the laser unit and a second energy supply unit for supplying energy to the welding torch, at least one control unit for controlling the laser unit and the welding torch, a control device for controlling the laser unit as a function of the welding torch, a detector for detecting the welding voltage and/or the welding current of the welding torch connected with the control device, a device for the temporally delayed activation of the laser beam after ignition of the electric arc, and an adjustment member for adjustment of the laser beam power as a function of the electric arc power.