| 摘要 |
It is an object of the present invention to provide a laser welding process and a laser welding system, wherein the welding of a fine area can be achieved, for example, with a welding nugget diameter equal to or smaller than 100 mum and a penetration depth equal to or larger than 200 mum, and a reduction in size of the system can be achieved. To this end, a laser welding process according to the present invention comprises the steps of allowing a laser beam outputted from a laser beam generating means 1 to enter into an optical fiber 10 through a light-introducing optical unit 9, and applying the laser beam exiting from the optical fiber 10 to a weld zone through a light-delivering optical unit 11. The laser welding process is characterized in that the optical fiber 10 has a core diameter set to be within 100 mum; an NA value for entrance of light into the optical fiber 10 is set to be equal to or smaller than 0.05, an NA value for exiting of light from the optical fiber 10 is set to be equal to or smaller than 0.1; and an energy of a one-pulse laser beam applied from the light-delivering optical unit 11 is set at a value equal to or smaller than 1 joule (J).
|
