Views: 0 Author: HanTenCNC Publish Time: 2022-01-23 Origin: Site
When it comes to welding, the first thing that comes to mind may be the connection of metal parts. So how are various plastic products seen in daily life welded? Next, the editor will discuss the plastic welding process method, plastic laser welding process
Plastics are classified according to their physical and chemical properties into thermosets and thermoplastics.
Among them, thermosetting plastics are chemical molecular structures, which are generally formed at one time. As shown in the left picture above, the switch panel and the bowl for children are made of thermosetting plastics. They have the characteristics of high temperature resistance.
Another type of thermoplastic has significantly different characteristics. As shown in the picture above, thermoplastic parts are softened or melted when heated, can be flow-formed, and can be heated repeatedly. It follows from this that not all plastic materials can be welded.
(1) Hot plate welding - welding after heating by the hot plate, as shown in the schematic diagram, the product is melted and then the hot plate is taken out, and the product is pressurized to achieve welding;
(2) Ultrasonic welding - using high-frequency vibration waves to transmit to the surface of the object to be welded, under pressure, frictional heat is generated to weld the product;
(3) Vibration friction welding - two plastic parts contact and rub against each other under a certain pressure, amplitude and frequency. Heat generated by friction causes the material to melt at the weld interface. Under pressure, molten plastic flows out of the weld area to form flash. After the vibration ceases, the molten plastic layer solidifies and produces a strong joint;
(4) Laser welding - Laser welding technology is a technology that uses the heat generated by a laser beam to melt the plastic contact surface, thereby bonding thermoplastic sheets, films or molded parts together.
Among them, the advantages of plastic laser welding are particularly obvious. It can process complex parts, and has the characteristics of short welding cycle, online monitoring and low equipment maintenance cost.