Method of laser welding, manufactoring method of control unit, and car electronic control unit

摘要

The invention stabilizes a quality of a laser welding in a terminal in which an outer appearance characteristic is not stabilized, and achieves an improvement of a positioning characteristic at a time of executing the laser welding without generating a cost increase. A hole (8) is formed in a terminal (2) of an integrated circuit sealed by a plastic molding. At a time of welding, a welding operation position is positioned by recognizing the hole (8) in accordance with an image recognition, and a laser welding is executed by irradiating a laser beam to a portion of a terminal (2) and a bus bar (5) positioned near an edge portion of the hole (8). The hole (8) is preferably formed in a circular shape or a similar shape thereto.