Laser welding heads are the most widely used laser welding technology in the automotive industry. In addition, there are laser marking technology, laser cutting technology and so on. It was first used for laser head welding of automotive gearbox gear sets. Use a 213KW CW co2 laser. Equipped with necessary cleaning, compaction, rotary table, laser, water cooling system, light guide system, protective gas system and online testing equipment. The whole set of equipment can weld two pieces per minute. Through long-term operation, a complete set of laser head processing management system has been formed, and a lot of work experience has been accumulated. The feasibility of the welding technology of automobile gear laser welding head has been fully affirmed by the manufacturer, and it has become a mature fixed technology in the automobile manufacturing industry.