| 摘要 |
PURPOSE:To lead a laser light to the groove bottom part side of the inside of a light leading path member by making incident the laser light of high energy density state reduced smaller by using a lens on the incident port of the light leading path member inserted between the relatively opposed welding faces of a welding member. CONSTITUTION:A light leading path member 5 is located at specified position approaching to the back plate 13 covering the space between welding faces 3, 4 by the lower end face thereof and the oscillation of a laser light is executed with feeding a shielding gas through a gas flow path 10. The laser light reduced smaller by being condensed by a lens 9 and of a high energy density state is led into a light leading path 6 through an incident port 7 and led to the outgoing port 8 side with performing multiple reflection on the inner face of the light leading path 6. Due to the light leading path 6 inner face being subjected to mirror working the energy density is slightly reduced compared to the incident port 7 in the outgoing port 8 but the energy density to the extent of melting the member of the groove bottom part side exists and the back plate 13 is outgone from the outgoing port 8, a filler wire 12 or metal powder is melted and the deposition of the groove bottom part side between welding faces 3, 4 is enabled. |
