Method of laser welding

摘要

A method of laser welding is disclosed. The method may be performed after an upper steel plate and a lower steel plate are overlapped. The method may include: forming a molten pool at the upper steel plate and the lower steel plate and welding the upper steel plate and the lower steel plate by irradiating a laser beam of focal region to a welding portion of the upper steel plate and the lower steel plate along a main welding pattern; and melting a peripheral portion of a keyhole formed at an end of the main welding pattern and welding the upper steel plate and the lower steel plate by irradiating the laser beam of the focal region along a fine welding pattern added to an end portion of the main welding pattern.

主权项

1. A method of laser welding by applying a main welding pattern and a fine welding pattern in sequence to an upper steel plate and a lower steel plate that are overlapped, the method comprising:
forming a molten pool at the upper steel plate and the lower steel plate; welding the upper steel plate and the lower steel plate by irradiating a main welding pattern having a continuous sine wave form to a welding portion of the upper steel plate and the lower steel plate along the main welding pattern; and irradiating a fine welding pattern proceeding in sequence from the end of the main welding pattern in a direction opposite to a moving direction of the main welding pattern, the fine welding pattern being irradiated with zigzag crossing along the main welding pattern subsequent to the end of the main welding pattern being irradiated, wherein a peripheral portion of a keyhole formed at an end of the main welding pattern is additionally melted to suppress pin holes generated at an end of the main welding pattern.