Patent ID: 9533378
Date: 2017-01-03
CPC Classifications: B23K,F01P,F02F,Y10T

Claim:
1. A laser welding method for welding a first member and a second member to each other with the use of a laser beam, comprising: subjecting at least one of the first and second members to a pre-irradiation process in preparation for irradiation of the laser beam and then connecting the first and second members to each other in order to carry out welding with the use of the laser beam; and causing laser beam irradiated members to melt by irradiating the laser beam to connected portions of both the first and second members, and welding both the first and second members to each other through the melting, wherein in the pre-irradiation process, a plurality of small absorption portions, which have a smaller absorption of the laser beam than both the first and second members, are formed at the connected portion of at least one of the first and second members at an interval in a direction in which the irradiated laser beam travels, and in the pre-irradiation process, recesses that respectively serve as the small absorption portions are formed at the connected portion of the first member and/or the connected portion of the second member, which are objects at which the small absorption portions are formed, intermittently in the direction in which the irradiated laser beam travels.