| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a gas sensor, capable of surely welding/fixing a main metal and an outer cylinder member, without lowering its yield rate, by using a noncontact poor weld determining method. <P>SOLUTION: The method includes: a welding step of irradiating an overlap part 11b of the main metal 4 and the outer cylinder member 11 with laser light in the circumferential direction, thereby forming a weld part 13, carrying out a welding all around so as to make a circuit of the overlap part from a start point 811, and performing the irradiation beyond the laser-light start point, thereby forming a overlap weld part 813; a poor weld determining step of determining whether or not a poor weld is produced, based on a monitored result; a rewelding step of making a circuit on the weld part 13 again by using a position as a start point which is shifted by a prescribed distance from the overlap weld part 813 in the circumferential direction, and then performing the irradiation beyond the start point, thereby forming another overlap weld part 823 being not overlapped by the overlap weld part 813, when the poor weld is produced; and a poor reweld determining step of determining whether or not a poor weld is produced, based on a monitored result of the laser irradiation. <P>COPYRIGHT: (C)2010,JPO&INPIT |
