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PLASTIC WELDING. A PHYSICS Video presentation by K Gowtham (reg:333).
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WHAT’S PLASTIC WELDING. Plastic Welding is a process applicable in plastic part fabrication for joining two compatible thermoplastics parts. It involves preparing the two thermoplastic parts, pressing them together in the proposed joints, and heating them using several heating techniques. Moreover, the heating technique used depends majorly on the plastic material. eg. ultrasonic plastic welding is commonly used for PVC Plastic welding has been a widely used technique in medicine, electronics, construction, etc..
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TYPES OF PLASTIC WELDING. 1.Ultra Sonic Plastic Welding 2.Laser welding 3.Friction welding 4.vibration welding 5.Hot Plate welding Out of these Ultra Sonic welding&Laser welding are mostly used..
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Ultra Sonic welding.
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Ultrasonic plastic welding uses mechanical vibrations with high frequency (15 kHz to 40 kHz) and produces heat,which in turn melts the plastic polymers. Due to that a molecular bond is formed between the plastic polymers. Therefore, ultrasonic plastic welded joints are strong and of the highest quality. Advantages of Ultrasonic Welding: *It is highly safe because it does not heat the plastic parts using direct heat. *It produces high quality welded joint . Disadvantages of Ultrasonic Welding: *The method is not suitable for thermoplastics with high moisture content and hard/strong thermoplastics such as polypropylene *High lead time because of the number of tools and processes required.
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Laser welding:. laser-welding-plastics-1.
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Laser welding is a plastic welding process that involves using a laser beam to thaw the plastic. However, the heat is kept below the plastics’ evaporation temperature. Pressure is then applied on thawing, and cooling occurs to strengthen the welded joints. Advantages of Laser Welding: It can heat the entire welding surface or a single spot. Welding can occur at room temperature or under special conditions Disadvantages of Laser Welding Not suitable for thick plastics. The initial cost of investment is high.
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