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Common plastic welding methods
Publisher: suzhou kailinneng automation equipment co., LTD Release time：2023-03-23 15:04:12 Click on the number of times：254 Shut down
Plastic welding is defined as the method of plastic connection in which the macromolecules of melt plastics are diffused and closely bonded together by means of pressure. Plastic welding is often used in the process of production and maintenance. For example, the intake manifold in our common car is welded together by vibration friction welding. Next, let's take a look at what are the common plastic welding methods!
First, external heat source
1 Hot plate welding
May be the most simple plastic welding technology, but this way is particularly suitable for large plastic parts need a large area of welding surface welding welding, generally flat electric heating plate will need to weld two planes after melting and softening quickly moved to the electric heating plate combined with two planes and force to cool.
This method welding device is simple, welding strength is high, the shape design of the product, welding part is relatively easy. But because the heat produced by the hot plate softening products, the cycle is longer; The fused resin will adhere to the electric heating plate and is not easy to clean up (F4 coating on the surface of the electric heating plate can reduce this phenomenon), the formation of impurities for a long time to affect the bonding strength; Strict control of pressure and time to ensure proper melting amount; When different kinds of resin or metal and resin bonded into the phenomenon of insufficient strength.
2 Hot Air Welding
When the hot air blows directly into the joint zone, the filler wire of the joint zone and the base material will melt. A weld is formed by melting the filler material together with the plastic to be welded.
This welding method welding equipment lightweight and easy to carry, but the operator's welding skills are relatively high requirements.
3 Hot rod and pulse welding
These two technologies are mainly used in the welding of thin plastic films. And the two methods are similar in that two films are pressed together and the instantaneous heat generated by hot rods or chromium wires is used to complete the welding. And the two methods are similar in that two films are pressed together and the instantaneous heat generated by hot rods or chromium wires is used to complete the welding.
Two, mechanical movement
1 Friction welding
According to the movement track can be divided into linear and rotating type; Linear welding can be used for straight welding and plane welding welding, rotary welding can be used for circular welding. The friction heat generated in the friction process of the two parts under the use of pressure makes the contact part of the plastic melt and soften, fixed until solid condensation.
2 Ultrasonic welding
High frequency mechanical energy is used to soften or melt the thermoplastic at the joint. The connected part is fixed together under the action of pressure, and then after the frequency of ultrasonic vibration is usually 20 or 40 KHZ, the transducer the high-power vibration signal, into the corresponding mechanical energy, applied to the contact interface of the plastic parts required to be welded, welding joint intense friction instantaneous high heat, so that the molecules alternately fuse, so as to achieve the welding effect.
Its advantages are: fast, flexible, welding is too short and stable and does not need flux or protective gas, also does not produce harmful gas or slag, product welding quality is guaranteed.