LASER AND LASER WELDING METHOD

摘要

Oxygen is included in auxiliary gases, and zinc-plated steel plates (3a, 3b) with no blow holes can be welded. As the auxiliary gases, an oxygen gas bomb (4a) for O₂ is provided in addition to an argon gas bomb (4b), argon gas and oxygen gas are mixed in a mixer (6), the mixture is delivered to a working head (7) and injected to a working point (9) via a nozzle (8). Oxygen oxidizes zinc of the zinc-plated steel plates (3a, 3b) to produce zinc oxide and zinc peroxide, which do not evaporate, the spatters are decreased in quantities and laser welding with a fewer blow holes can be performed.