According to BMW the company's experts, when the  Welding Flux, BMW has used a dual-focus laser welding technology. Because of this technology in the process of welding aluminum alloy has good performance, it is widely used in BMW's high-volume production process.

In laser welding, laser welding technology dual focus can be a very small distance between welding material to form the two focal point, enabling the laser beam splitting and stacking. Superposition of two laser light sources to form a laser beam, can greatly improve the laser power, the stability of production, product quality and production flexibility. Laser welding power increases on the one hand can increase the depth of laser welding seam; the other hand, can also increase the welding speed of laser welding; but can also avoid common Rongdong aluminum Low Alloy Steel Electrode and welding defects such as burn.