Laser welding machine is an efficient precision welding method by using high energy density laser beam as a heat source, which is one of the important aspects of laser material processing technology application. At this stage, with the adjustment of the energy structure and the improvement of environmental protection requirements, the automotive industry is developing in the direction of lightweight, the use of new lightweight materials is one of the effective means to achieve automotive lightweight. Laser welding, with its unique advantages, is playing an increasingly important role in realizing the connection of lightweight materials.

Automobile lightweight is not according to the literal understanding of "reduce the weight of the car", but in ensuring the quality of the car, more new materials are applied to the functional parts and structural parts of the car, so that the performance of the auto parts is more excellent, while the weight is lighter, to ensure that the car reduces the consumption of energy during the driving process, to achieve multiple effects.

At present, automotive lightweight technology is mainly achieved through the following ways:

1. The proportion of lightweight materials is rising, aluminum alloy, magnesium alloy, titanium alloy, high-strength steel, plastics, powder metallurgy, ecological composite materials and ceramics.

2. Structural optimization and modular design of components continue to improve, such as the use of front-wheel drive, high-rigid structure and ultra-light suspension structure to achieve the purpose of lightweight,

3. The development of computer aided integration technology and structural analysis; It makes the automobile manufacturing industry constantly innovate in forming methods and connecting technologies.

Among the above three ways to achieve automotive lightweight, laser cutting and laser welding have become an important technical means to achieve automotive lightweight with their unique advantages.

As far as laser welding is concerned, laser welding machine is non-contact, in the process of processing, you can not touch the product can achieve precision welding, and the traditional connection, some by screw fastening, some by adhesive connection, and can not meet the requirements of precision and robustness in modern automobile manufacturing, and the traditional way is not suitable for connecting new materials. In contrast, laser welding has achieved leapfrog progress in the robustness, seamlessness, precision and cleanliness of the connection, and will become an important molding method in the future.