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Application Of Plastic Welding Technology In Automobile Industry
Jan 24, 2018

In modern vehicles, whether external decorative pieces (such as bumper, fender, wheel cover, diversion board, etc.), interior decoration (such as instrument panel, door Board, Deputy Dashboard, Sundries box cover, seat, rear guard board, etc.), or functional and structural parts (fuel tank, radiator water room, air filter cover, fan blades, etc.), The shadow of a plastic workpiece can be seen everywhere. At present, the 100kg plastic material of modern automobiles replaces the traditional metal materials which need 200~300kg, and the weight-loss effect is very outstanding, which is of great significance for saving energy and reducing greenhouse gas emission. such as automotive plastic intake manifold replacement metal can reduce the quality of 40%~60%, and surface light flow resistance is small, can improve engine performance, and in improving combustion efficiency, reduce fuel consumption, vibration and noise reduction have played a certain role. According to statistics, automotive plastic varieties have reached dozens of, the average amount of plastic per car has accounted for the weight of the car 5%~10%, with the development of automotive lightweight requirements and the expansion of automotive plastics technology applications, automotive plastic bicycle consumption will be further increased in the future. Automotive plastics are divided into two types: one is thermosetting plastic, they can withstand the ordinary drying operation; one is thermoplastic, which has the advantages of easy processing and fast. In the automotive plastics, the top 7 plastic material varieties and accounted for roughly: polypropylene 21%, polyurethane 19. 6%, polyvinyl chloride 12. 2%, thermosetting composite material 10. 4%, ABS 8%, nylon 7. 8%, polyethylene 6%. The connection of plastics is the key link of its wide application. Plastics can be connected by mechanical fastening, bonding or welding. Tight connection speed, suitable for all plastics, but high cost, will produce stress concentration, can not form a sealed joint or get the proper performance. Bonding can obtain excellent performance and quality joints, but difficult to operate, the need to carefully carry out joints and surface preparation, and slow, not suitable for mass production. The hot-air plastic welding economy, simple, fast and reliable, can form static strength close to the base of the joint, and therefore suitable for mass production, in the automotive industry has been more and more extensive applications. Plastic welding technology has become a measure of automotive production technology and new materials development level of one of the signs. Various plastics welding methods in automobile industry

The welding of plastics is limited to the welding of thermoplastics, since only thermoplastics can melt or soften when heated, and thermosetting plastics cannot soften and remelting when heated. The hot air welding is similar to the metal oxygen acetylene welding gas, except the latter uses the hot air to heat the former flame. Hot gas welding process, from the torch (recommended the use of Leister torch) in the hot gas flow (typical temperature is 20-700°c, continuous adjustment, flow maximum up to 230l/min) at the same time to the welding electrodes and welding parts heating, when the material surface softened to a viscous state, the electrode continuous pressure into the weld. The electrode material is exactly the same as the base material, and is usually round (about 5mm in diameter), and the welded plate is welded with multiple welds. A disadvantage of circular electrodes is that the air bubbles are easily trapped in the weld in the process of multiple weld, resulting in lower strength, this problem can be solved by using the triangular section electrode. The typical materials available for hot air welding include polyvinyl chloride, polyethylene, polypropylene, plexiglass, polycarbonate, POM, polystyrene, nylon, ABS, etc. The main advantage of hot air welding is adaptability (flexibility), which can be used to process large and complex parts with simple portable equipment.

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