Particle-free welding of high-tech thermoplastics


tandem welding machine G1200-HGS-5NC

KVT Bielefeld has developed the hot gas welding process in order to meet the requirements of the automobile industry. This thermal welding process patented by KVT Bielefeld works without any contact in a shielding gas atmosphere.
With an optimum weld strength, no particles whatsoever, as arise in the case of mechanical welding processes, are produced by the welding process. The machines are therefore utilised, if necessaly, in clean rooms as well. Any thermal damage to the plastics is also excluded by utilising shielding gases. The area of application of this process is primarily the welding of media-carrying and media-storing components from the engine compartment region. Not only components with two-dimensional weld paths but also, of course, components with threedimensional weld paths can be joined with the hot gas welding process. Shadow grooves can also be achieved in order to cover the weld. At the moment, the users are welding series products with weld wall thicknesses from 1 mm to 18 mm. In addition to the welding of semi-finished products made of PA, PAA, PET, PPS and other polymeric materials, the hot gas welding process is also being introduced to an increasing extent for the welding of "soft" semifinished products made of TPA, TPE, TPU or TEEE, as are used (for example) for the fabrication of piping systems and airbag covers. Precisely in the case of the fabrication of interior parts, the utilisation of the hot gas welding process results in totally new possibilities.
At the beginning of this year, KVT Bielefeld developed a tandem welding machine with two working stations for this process. Both these working stations use the same heated tool and are equipped alternately. The installation is designed for fully automatic loading. However, manual loading is possible too.

Hot-Gas-Welding

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