Hot air welding, also known as hot air welding, is a method in which compressed air or inert gas (usually nitrogen) is heated to the desired temperature through a heater in the welding gun, sprayed onto the surface of plastic and the strip, and the two are melted and combined under low pressure. The hot gas welding method is mainly used for welding plastics such as polyvinyl chloride, polyolefin, polyoxymethylene, nylon, etc. It can also be used for welding plastics such as polystyrene, ABS, polycarbonate, chlorinated polyether, chlorinated polyethylene, etc. Traditional welding methods generate small particles at the welding site, and the welding strength is not guaranteed. This advanced hot gas welding is mainly used to solve these problems. Hot gas welding is also suitable for welding plastic parts that cannot be traditionally welded due to their susceptibility to thermal decomposition or material damage. So, for high-end thermoplastic materials that require high strength and cannot have welding particles, hot gas welding is the only option. During the entire welding process, there will be no particle debris generated inside the welded part, as the compressed and extruded parts of the welding adhere to the welding line. The hot gas welding process is similar to hot plate welding or infrared welding. Firstly, fix the two parts to be welded onto the fixture, which can be horizontal or vertical. The fixed process is usually manually operated, and of course, six axis robots can also be used to complete it. Before welding, the pneumatic clamp on the fixture will activate to secure the tightly attached parts onto the fixture. Hot gas welding can weld large parts with complex shapes and clamp them to ensure accurate positioning during the heating phase. But there is a problem here, due to the warping after molding, large parts with complex shapes (such as intake manifolds or taillights) will inevitably undergo some changes in size. At the same time, due to the nozzle being very close to the part (1-3 millimeters) during heating, even small changes in part size may cause one or more nozzles to come into contact with the part, and strict control of plastic deformation is required.
The nozzles are arranged according to the shape of the parts
