With the development of laser technology and aluminum alloy research technology, it is particularly important to further study the basic application technology of aluminum alloy laser welding, develop new technology of aluminum alloy laser welding, expand the application potential of aluminum alloy laser welding structure more effectively,battery pilot line and understand the current status and development trend of the application of aluminum alloy laser welding technology.

High-strength aluminum alloy with high specific strength, high specific stiffness, good corrosion resistance, good processing performance, excellent mechanical properties, etc., has become an indispensable metal material for lightweight manufacturing in the fields of aerospace and shipbuilding.laser welding machine for lithium ion batteries Welding technology has unique advantages in improving the utilization rate of structural materials, reducing structural weight, and realizing the low-cost manufacturing of the overall structure of complex dissimilar materials.

Compared with other welding methods, laser welding has the advantages of centralized heating, small thermal damage, large weld depth-to-width ratio, and small welding distortion. The welding process is easy to integrate, automation and flexibilization, can realize high-speed, high-precision welding, especially suitable for high-precision welding of complex structures.

With the development of science and technology of building materials, a variety of high-strength and high-toughness aluminum alloys continue to innovate and launch, especially the third generation of aluminum-lithium alloys, the emergence of new high-strength aluminum alloys, aluminum alloy laser welding production technology puts forward its own more with higher requirements, while the diversity of aluminum alloys also brought about the realization of a variety of new problems of laser welding, so we must be more in-depth analysis of the research to discover these social issues, so that we can more effectively expand the aluminum alloy laser welding.ESS lithium battery machine In order to more effectively expand the application of aluminum alloy laser welding structure market potential.

High Power Laser

Laser welding is a high-intensity laser radiation to the metal surface, through the laser and the thermal coupling between the metal to make the metal melt and then cool the crystallization of the formation of weld technology. According to the thermal mechanism of laser welding can be divided into two kinds of thermal conductivity welding and deep fusion welding, the former is mainly used in precision parts of the package welding or micro-nanometer welding; the latter in the welding process often produces similar to the electron beam welding hole effect, the formation of deep and wide relatively large weld seam. Laser deep fusion welding to realize the need for high laser power, the technology is currently applied to laser deep fusion welding of high-power laser there are four main types.

1.CO2 gas laser

Working medium for the CO2 gas, the output wavelength of 10.6μm, according to the laser excitation structure is divided into two types of cross-flow and axial flow. Cross-flow CO2 laser output power has reached 150kW, but the beam quality is poor, not suitable for welding. Axial CO2 laser beam quality is good, can be used for welding aluminum alloy with high laser reflectivity.

2.YAG solid-state laser

Working medium for ruby, neodymium glass and neodymium-doped yttrium aluminum garnet and so on. Output wavelength of 1.06 μm. YAG laser than CO2 laser is more easily absorbed by the metal, less affected by the plasma. It has the advantages of fiber optic transmission, flexible welding operation, good accessibility of weld position, etc. It is the main laser for aluminum alloy structure welding.

3.YLR fiber laser

It is a new type of laser developed after 2002. It is based on optical fiber, doped with different rare earth ions. The output wavelength range is around 1.08μm, also fiber transmission. Fiber laser revolutionized the use of double cladding fiber structure, increased the pumping length, improve the pumping efficiency, thus greatly improving the output power of the fiber laser.YLR fiber laser appeared later compared to the YAG laser, but has the advantages of small size, low operating costs, high beam quality, high laser power and so on.