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Seven Plastics Welding Methods

Seven Plastics Welding Methods

1. Plastic welding method 1: heating tool welding


Use a heating tool, such as a hot plate, a hot strip, or a soldering iron, to directly heat the two plastic surfaces to be welded until the surface has a sufficient molten layer, then remove the heating tool and immediately press the two surfaces until the molten part is cooled and hardened to connect two plastic parts to each other. This processing method is called heating tool welding. It is suitable for welding plexiglass, hard PVC, soft PVC, high-density polyethylene, polytetrafluoroethylene, polycarbonate, polypropylene, low-density polyethylene, and other plastic products. At present, the more common connections such as PP-R pipe fittings use this process.


2. Plastic welding method 2: high-frequency induction welding


Place the metal insert on the surface of the plastic weldment and temporarily bond it together with appropriate pressure, and then place it in an alternating magnetic field, so that the metal insert will be combined due to the induction of electric potential and heat, which will cause the plastic to melt. Welded products are obtained by cooling, and this welding method is called induction welding. This welding method is suitable for almost all thermoplastics.


3. Plastic welding method 3: Ultrasonic welding


Ultrasonic welding is also a thermal welding method used by hdpe pipe welding company. The heat is obtained by using ultrasonic to excite plastic for high-frequency mechanical vibration. When the ultrasonic is directed to the surface of the plastic to be welded, the plastic particles will be excited by the ultrasonic to vibrate rapidly to produce mechanical work. It is then converted into heat, the temperature of the welded plastic surface rises and melts, and the temperature of the non-welded surface does not rise. Ultrasonic waves are introduced into the welded plastic through the welding head. When the welding head stops working, the plastic immediately cools and solidifies. According to the structure of the ultrasonic hydraulic welding machine, various thermoplastics can be welded.


4. Plastic welding method 4: high-frequency welding (high-frequency welding)


As there are various types of plastic pipe welders for sale on the market, high-frequency welding is one of the most popular ways. Place the two laminated plastics between the two electrodes, and let the electrodes pass high-frequency current. Under the action of the alternating electromagnetic field, the free charge in the plastic will naturally repeat at the same frequency (but slightly lagging behind). Displacement (polarization) causes the polarized molecules to vibrate frequently and generate friction. Electric energy is converted into heat energy until it melts, and then external force is applied to combine with each other to achieve the purpose of welding, which is called high-frequency welding. It is suitable for plastics composed of polar molecules, such as films or sheets made of polyvinyl chloride and polyamide.


5. Plastic welding method 5: friction welding


The friction heat generated by the friction between the thermoplastics is used to melt on the friction surface, and then pressurized and cooled to bond them. This method is called friction welding. This method used by pipe welding machine manufacturers is suitable for cylindrical products.


6. Plastic welding method 6: hot air welding


Hot air welding has the characteristics of convenient use and simple operation. It is especially suitable for welding plastic plates. This processing method is to pass compressed air (or inert gas) through the heater of the welding torch and be heated to the temperature required for welding plastics. This preheated gas heats the weldment and the electrode to reach a molten state so that the welding can be combined under a small pressure.


7. Plastic welding method 7: Laser plastic welding


In the United States, laser welding seems to have developed into a connection method that is particularly suitable for certain applications. In these applications, laser welding has cost and performance advantages compared to other welding methods.


One of the major advantages of laser welding is that it uses non-contact heating to heat the plastic workpiece, and even the complex three-dimensional surface to be welded can be plasticized. Therefore, infrared welding technology is especially suitable for parts with complex curved surfaces and large structural plastic parts.

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