| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a valve mechanism which can secure stable sealing performance easily at a low cost while integrating a seal member with a valve or a sealing face forming member, a valve gear, a liquid jet device, a laser welding method which can efficiently integrate the seal member with a member to be joined, and a laser-welded joint produced by the laser welding method or the like. <P>SOLUTION: An annular channel 53 with a trapezoidal cross section is formed in the plane part 51 of the seal member 43 made of a laser beam absorbing material, and an annular projection 54 corresponding to the annular channel 53 is formed on the joining plane 55 of a passage forming member 31 made of a laser beam transmitting material. The seal member 43 and the passage forming member 31 are laser-welded together by being irradiated with laser beams which recess-projection engage the annular channel 53 and the annular projection 54, plane-join the plane part 51 and the joining plane 55, and has a cross section of approximately the same shape as a joining interface on the irradiated plane 56 of the passage forming member 31. <P>COPYRIGHT: (C)2007,JPO&INPIT |
