A gas shielding method and a gas shielding apparatus for laserwelding

摘要

The present invention relates to a gas shielding method and apparatus for laser welding plural bodies to be welded. The method comprises the steps of: blowing an inert gas onto a part to be welded (5) from a coaxial nozzle (6); blowing a compressed shielding gas around the part to be welded (5) so as to cover the inert gas from at least one discharging nozzle (7) provided at the outer side of the coaxial nozzle (6); wherein the inert gas and the compressed shielding gas are blown off in parallel with one another. The gas shielding apparatus comprises: a coaxial nozzle (6) to blow an inert gas onto a part to be welded; and at least one discharging nozzle (7), provided at the outer side of the coaxial nozzle, to blow a compressed shielding gas around the part to be welded so as to cover the inert gas, whereby the inert gas and the compressed shielding gas are adapted to be blown off in parallel with one another.