Plastic welding is for the welding of semi-finished plastic materials. Plastic welding joins together softened surfaces of materials, usually with heat (except solvent welding). Welding of thermoplastics has three sequences, surface preparation, application of heat and pressure, and cooling. There are many welding techniques available for joining plastic semi-finished materials.
Hot gas welding, ultrasonic welding, and pulse current hot melt riveting are the most common.
Hot gas welding, also called hot air welding, is a traditional manual welding method. Generally, hot gas with a pressure of a.1~a5P uses to heat the plastic and the electrode. At the same time, the welder presses the electrode by hand to form the action pressure or uses auxiliary tools to exert force and achieve welding. However, labor costs and requirements for welding workers are relatively high.
Ultrasonic welding, the principle of plastic ultrasonic welding, is similar to ultrasonic metal welding. If the distance between the ultrasonic vibration head and the plastic welding surface is very close, it is generally called short-range welding. Otherwise, it is called remote welding. Due to the significant energy loss when ultrasonic waves are transmitting in plastics, the effect of remote welding is not suitable for soft plastics, and short-distance welding can be instead. The performance of plastic ultrasonic welding is usually related to the hardness or modulus of the material. Compare. Ultrasonics can also use for spot welding of plastics and embedded welding of metal parts in plastics.
In ultrasonic welding, high frequency (15 kHz to 40 kHz) low-amplitude vibrations generate heat through friction between the materials to join. The two parts' interface is particular and concentrated on realizing welding strength. Ultrasound can use on almost all plastic materials. Ultrasonic welding is the fastest heat-sealing technology available.
The pulse current heating method uses the Joule heat generated when the pulse current flows through the high-resistance material to heat the welding. Generally, a thermocouple connects to the front end of the heating nozzle. The generated power is fed back to the control power supply in real-time to ensure the correctness of the set temperature.
The pulse current heating plastic riveting device adopts a new type of plastic processing technology to connect products made of different materials. The thermosetting plastic products and metal products are tightly connected. Press through the prefabricated holes on the stamped metal plate. After the plastic rivet column on the protruding part of the metal surface by controlled heat melting press with metal rivet heads of various shapes, cooled, reshaped, and clamped tight.
Depending on the process requirements of different products, plastic welding makes different shapes of plastic heads. Plastic welding can realize flush riveting of riveting plastic columns and riveting piles, hemispherical riveting, arc flanging riveting, rib-like riveting, mechanical riveting, folding and inlay package override, and so on.
It can also realize the connection method of mechanical riveting and assembling materials of different materials. The connecting parts are beautiful, firm, not easy to embrittle, and have good sealing performance, realizing the optimal design of the product structure.
Make full use of the best combination of mechanical properties of various materials, significantly improve the mechanical properties of the overall composition to achieve the perfect combination, and has the characteristics of shock resistance, adaptability to temperature, harsh temperature environment, and no pollution.
This technology is superior to other commonly used traditional methods, does not require other filler materials, reduces production processes, and reduces processing costs and material consumption.
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