Patent
Laser welding device
Masanori Moribe,正典 森部 +1 more
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TLDR
In this article, the clean air is fed from an air feeding port 8 into the beam transmission line 3 and discharged from the opening 18 under a converging mirror 2, and the shield gas is blown against the weld zone 4 from a shield gas nozzle 6.Abstract:
PROBLEM TO BE SOLVED: To surely shield a welding part by providing an opening with a clean air filled in a beam transmission line and blowing a shield gas against the laser beam converged from the opening and the welding part through a special shield gas feedling section. SOLUTION: The clean air is fed from an air feeding port 8 into the beam transmission line 3 and discharged from the opening 18 under a converging mirror 2. The clean air is filled in the beam transmission line 3 to keep cleanliness in the beam transmission line 3. Furthermore, the shield gas is blown against the weld zone 4 from a shield gas nozzle 6. The weld zone 4 is separated from the atmosphere with an inert gas such as Ar, He or the like used as the shield gas to prevent the generation of welding defects such as oxidation in the weld zone and voids owing to the air entrupment or the like. In addition, the reduction of the generating laser inductive plasma in the weld zone is restrained with the function of the inert gas, whereby the generation of a burn through is prevented.read more
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