| 摘要 |
Welding operations on a grid support 1 housed in a welding chamber 23 is carried out using a laser welding apparatus placed outside the welding chamber. In the interior space of the chamber, a pair of supply nozzles 44 are disposed on each of the mutually orthogonal edge sections of two top and bottom glass surfaces 27a, 27b of the roughly cubic chamber 23. An inert gas is ejected in a planar stream from the blast slot openings 45 provided on each supply nozzle 44 along the top and bottom glass surfaces and side glass surfaces. The glass surfaces 27a, 27b that face many welding sections of the grid support are shielded by the sweeping action in two directions, and the glass surfaces 27c that oppose lesser number of welding sections are shielded by the sweeping action in one direction with the inert gas. Fumes and plasmas produced from welding sections are thus swept away before they can reach the glass surfaces, and are discharged with the spent inert gas.
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