If aluminum and aluminum alloy products or accessories are welded firmly and the weld is beautiful, of course, it is inseparable from the aluminum alloy laser welding machine. Although the laser welding effect is good, aluminum and aluminum alloy have the characteristics of high reflection and small attraction rate. There are still technical difficulties in welding, so pay attention to 3 points when laser welding.
We know that aluminum and aluminum alloys are the most extensive type of non-ferrous metal structural materials. The metal performance is very good. Compared with general metal alloy materials, they have high strength and good corrosion resistance, and are used only after steel. It has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industries. With the rapid development of industry, the demand for aluminum alloy welded structural parts is increasing. Up to now, aluminum alloy is an alloy material with many applications, and it is a big demand in the laser welding industry.
1. When laser welding aluminum alloy, light reflection occurs on the surface of the aluminum alloy, because the aluminum alloy is a non-ferrous metal, which has a strong reflectivity to various kinds of light. The non-ferrous metal such as aluminum alloy has high reflectivity for laser And smaller absorption rates. Therefore, before welding the aluminum alloy, the surface of the aluminum alloy needs to be cleaned to remove the oil stains on the surface. At the same time, to prevent explosion and other safety threats caused by oxidation during welding, it is also necessary to thoroughly clean the oxide film on the metal surface and completely remove the oxide film.
2. Make full preparations when laser welding aluminum alloys, because aluminum alloys have the characteristics of being lively and easily oxidized, and a large amount of dust and moisture are easily attached to their surfaces. Therefore, in the welding process, if not enough For the preparation, the things attached to the surface are easy to stay on the aluminum alloy surface with the rapid welding of the laser, thereby affecting the quality of the aluminum alloy and the welding effect.
3. In addition, metals all have thermal conductivity, so aluminum alloys also have strong thermal conductivity. It is easy to reflect the laser or quickly dissipate the heat of the laser when welding with laser, which eventually leads to aluminum alloy Welding failed. Therefore, when laser welding aluminum alloys, we must pay close attention to and quickly increase the laser power density to prevent reflection or conduction, and strive to weld aluminum alloys with extremely high density at extreme times, so that reflection can be avoided And other problems.
