Regarding device size, there are two opposite trends in the market: on the one hand, the device is getting smaller and smaller, and the weld is complex; on the other hand, the device is larger and three-dimensional. The continuous development of laser welding equipment can meet both of these requirements, provided by Laser Laser Welding.
At present, medical diagnostic products continue to develop toward miniaturization, which requires welding technology to simultaneously integrate several functional devices in a minimum space. It is very difficult or impossible to weld capillary microfluidic structures by other methods, and now, even today's inexpensive SEM scanning laser systems can solder such products. Previously, people chose Nd:YAG lasers that were easy to focus on, but the technology was very expensive and the technology was not flexible enough. In contrast, fiber laser or fiber-coupled diode laser welding technology can not only meet the weld width of 0.1mm, but also is not limited by the shape of the weld and the size of the chamber.
If the inner diameter of the fiber is reduced, the SEM scanning laser system can also weld smaller welds or larger weld areas while achieving high speed welding. In order to adapt to the changing trend of device size, LPKF (Lopco Optoelectronics Co., Ltd.) has developed an electron microscope scanning and welding system suitable for three-dimensional welding (as shown in Figure 3). The focal depth variation of the system is up to 80mm, so that diodes are used together. The laser can enlarge the welding area of ​​the welded workpiece to 370 mm × 370 mm and the weld width is less than 2 mm. Currently, this technology has been applied to large three-dimensional automotive parts such as welding engine compartments or automotive interiors.
However, the application processing of the SEM scanning system has certain limitations. Complex three-dimensional components such as automobile taillights may obstruct the laser irradiation due to the concave or reverse beam angle, so the contour welding method must be selected. Contour welding has very strict requirements on the workpiece, and the welding cycle is long, which limits its application in this respect.
LPKF has invented a hybrid welding method that compensates for many of the shortcomings of contour welding and has great advantages when welding three-dimensional large parts. The method uses a flexible, flexible robot to guide the laser, while the pressure required by the fixture comes from the weld head. The rollers used generate a lot of pressure without indentation of the workpiece and it is not sensitive to dirt. More importantly, the technology uses a laser with a chlorine lamp with a wider spectrum. The chlorine lamp directly heats the upper workpiece while absorbing heat from the underlying workpiece to form an integral heating of the workpiece. Compared with the conventional welding method, the heat transfer of the workpiece welding surface is more uniform, and the hardness of the upper workpiece is reduced. If there is a gap error, it can be processed earlier, thereby ensuring a higher and more stable welding quality, and at the same time shortening. Welding time. The addition of a chlorine lamp effectively reduces the power of the laser required and correspondingly reduces the cost. In addition, when the composite welding is applied, the inherent residual stress of the workpiece is small, and the subsequent tempering treatment can be greatly simplified or even unnecessary, which is of great benefit to the amorphous thermoplastic material.
In addition to innovations in device welds, a number of new material combinations have emerged, and laser welding techniques are no longer limited to combinations of hard/hard materials. New laser welding materials are emerging, including thermoplastic fabrics, thermoplastic elastomers, and sheet materials for packaging and medical catheters, expanding the range of applications for laser welding. Now, even laser cleaners or coatings can be used to achieve clean welding of amorphous plastics, which is simple and reliable. The emergence of other laser sources, such as CO2 lasers, provides a new opportunity for laser welding technology because its long-wavelength light can be absorbed by any transparent plastic.
From an economic point of view, innovations in diode lasers and process technologies ensure efficient laser welding, and the reduction in laser costs also means lower investment costs. More importantly, by continuously extending the maintenance interval and the service life of the equipment, the working hours of the machine are further improved by laser welding.
Contact information
Company Name: Laser laser marking for laser welding
Address: 100m south of the intersection of Shuixiu Road and 339 Provincial Road, Kunshan City
Tel: 0512-57731013 13773169338
Fax: 0512-55194018
mailbox:
Website:
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