With the increasing use of metal products, the demand for metal welding has increased dramatically, and the traditional welding technology is increasingly difficult to meet the actual demand. In recent years, the rapid development of laser technology makes laser more prominent in industrial metal processing. The application of laser technology combined with metal welding head is also facing new challenges.
In order to deal with the current quality of laser welding and welding surface,WSX introduces swing joint. The welding head combines laser beam swing and welding tracking technology to adjust the transverse position of the welding head when the welding position changes and to provide excellent welding quality on highly reflective materials. The standard welding spot is designed to focus the collimated laser beam to the desired spot size and keep the beam path stationary and the stationary spot on the focal plane during the beam propagation. This standard configuration limits each setting to a specific application. In contrast, swing solder joints incorporate scanning galvanometer technology in standard solder joints. By moving the light beam through the endoscope, the focus is no longer stationary, but can be changed by changing the shape, amplitude and frequency of various patterns. For dynamic adjustment, frequency setting provides the best results based on spot size, swing diameter and linear welding speed. In addition, this welding technology is compatible with standard coaxial nozzles and auxiliary gas devices to suppress metal vapor generated during welding and to help suppress plasma phenomena and control slag splashing.
When using smaller laser spots, the benefits of this oscillating welding head are more obvious. When near infrared ( NIR ) wavelength is used, a smaller spot will obtain a larger power density, thus overcoming the high reflectivity of materials such as copper and aluminum. When these parameters are used, the generation of voids and cracks is avoided. This opens up new applications for infrared fiber lasers in the fields of electric vehicles and battery manufacturing.
In addition, different metal material manufacturers often need to weld different parts, which requires the flexibility of welding equipment to meet the specific requirements of each part. Changing the swing diameter will change the weld width and penetration without changing any optical structure or spot size. For a constant energy input, with the increase of swing amplitude, the shape of the weld seam changes from the traditional nail head shape to a rectangle. This welding cross section allows custom control and can be used for welding battery connectors of high-power battery packs, resulting in a large welding contact area, which reduces the resistance in the welding joint and provides good mechanical connection performance.
When dissimilar materials ( such as copper and aluminum ) are welded in an overlapping manner, dilution of the materials can be controlled by controlling penetration. The amount of molten material can be minimized by shallow melting of the underlying metal foil, and dilution can be controlled to reduce the generation of intermetallic compounds without the use of filler materials.
Traditional laser welding head requires high precision clamps, but in many cases, the welded parts are not really clamped to the required position. Beam swing technology can greatly reduce the clamping requirements of these welded parts. The welding gap and offset of swing welding are 2 - 3 times that of common laser welding.
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