1.Aluminum alloy laser self-melting welding

For laser welding of aluminum alloy, the initial reflectivity of aluminum alloy surface to laser is high, which requires larger laser power, smaller spot diameter, poorer adaptability of the workpiece to the middle and gap, higher requirements for precise adjustment of the welding equipment and beam, fast heating and cooling speed of the welding process, the small hole effect leads to the evaporation of alloying elements, and the welding of more defects of air holes, the laser energy density is concentrated, the small hole effect leads to the Serious volatilization and burning of alloying elements, and the weld is prone to biting edges and biting edges. Thin-walled structural parts of the forming accuracy is difficult to accurately control, welding assembly gap is large, there are inevitably some wrong edges,battery pilot line laser self-melting welding technology is difficult to promote the application of aluminum alloy thin-walled structure.

For the above characteristics of aluminum alloy laser self-melting welding, laser self-melting welding technology is generally only used for thin structure sealing welding, welding quality requirements are not high.

2. Aluminum alloy laser wire filling welding

Compared with the laser self-melting welding, laser filler welding relaxes the welding production process design requirements; by filling their own different economic composition of the wire, improve the weld can be organized structural mechanical system performance, change the weld metal flow assets characteristics, improve the weld shaping, inhibit porosity,laser welding machine for lithium ion batteries cracks and other defects; the use of changes in the smaller power of the laser to achieve the thick plate narrow weld channel multi-layer welding; laser filler efficiency and the conventional Self-melting welding is about the same, the parameters need to choose the appropriate, greater than the laser self-melting welding welding efficiency P. Aircraft wall plate is the development of laser filler wire welding construction technology is the most typical application.

3. aluminum alloy laser - arc composite welding

Laser - arc composite welding technology is by the British Imperial College, Professor W. Steen in the 1970s proposed a composite heat source welding method. Laser-arc composite welding has both the advantages of laser and arc, but also to make up for their shortcomings.ESS lithium battery machine Its characteristics are as follows:The heating of the arc extends the single-pass laser welding solidification speed, which is conducive to reducing porosity and crack defects. The role of the arc wire can improve the weld metallurgy, and improve the process adaptability of the laser to the gap and dislocation. Therefore, laser-MIG arc composite welding technology is one of the best methods to achieve high efficiency, high adaptability and high quality welding of aluminum alloy thin-walled structures. In foreign countries, aluminum alloy laser-MIG arc composite welding technology has been widely used in aerospace, automotive, high-speed trains and other fields.

4. aluminum alloy laser - arc double-sided welding technology

Aluminum alloy using laser - arc composite welding (i.e., general same side composite welding). Since the laser can only act on the workpiece after passing through the arc, the arc plasma absorption of laser light, scattering and refraction inevitably leads to the loss of laser energy. Studies have shown that, according to the laser and arc heat input, showing three typical joint shapes: small girdle "X" type, medium girdle "X" type, large girdle "X" type. At the same time, the welding process is stable, the welding efficiency is greatly improved, compared with the traditional single laser welding, process adaptability is significantly enhanced.

5. Aluminum alloy dual-beam laser welding technology

In order to solve the limitations of the traditional single-beam laser welding, the single-beam laser is divided into two laser beams, which can conveniently and flexibly adjust the temperature field and flow field of the laser welding, change the way of the existence of the small holes and the flow of the molten pool, improve the process adaptability of the single-beam laser welding, and provide a wider range of choices for the laser welding process.