At present, many products (including the automotive semiconductor industry, the pharmaceutical and food industry, etc.) have very high requirements for processing accuracy and aesthetic appearance, which makes laser welding a necessary process for the production of these products and promotes the further development of laser welding technology.
The closer the compatibility, fusion temperature, and matching of plastic laser welding are, the better the effect will be. The application method of plastic laser welding is different from that of metal welding
1.Contour welding
The laser moves along the contour of the plastic welding layer and melts it, gradually bonding the plastic layers together; or the sandwiched layer is moved along the fixed laser beam to achieve the purpose of welding.
In practical applications, contour welding has higher quality requirements for injection molded workpieces, especially applications with complex welding lines such as oil and gas separators. Contour welding can achieve a certain penetration depth of the welding line during the plastic laser welding process, but this penetration is very small and uncontrollable, which requires that the deformation of the injection molded parts should not be too large.
2. Simultaneous welding
The laser beam from multiple diode lasers is shaped by optical elements. The laser beam is guided along the contour of the welding layer, while generating heat at the weld, so that the entire contour melts and bonds at the same time. Together.
Simultaneous welding is mainly used in automotive lighting and medical industries. Simultaneous welding is a multi-beam, optically shaped light spot that presents the welding trajectory. Its characteristic is to reduce internal stress. Because the requirements are relatively high and the overall price is relatively high, it is widely used in medical treatment.
