Device and method for plasma keyhole welding with change of the gas volumic flow and/or the gas composition depending of at least one boundary condition of the welding process

摘要

Plasma keyhole welding of a workpiece using at least one process gas comprises: temporally changing the gas composition and/or at least one gas volume flow rate of the process gas; or temporally changing the gas volume flow rate and/or the gas composition of at least one process gas, during a welding process, as a function of at least one basic condition of the welding process. An independent claim is also included for a device for plasma keyhole welding, comprising an electrode, means for supplying the electrode with welding current, at least one nozzle, and gas provision means for providing at least one process gas with a gas volume flow rate and a gas composition, where: a plasma jet is generated by means of the electrode and the process gas; at least one gas volume flow rate and/or at least one gas composition is temporally changed; and means is provided for changing a gas volume flow rate and/or gas composition of at least one process gas during a welding process as a function of at least one basic condition of the welding process.