Abstract
This chapter draws attention to the usage of polyvinylidene fluoride (PVDF) in different types of welding methods such as heated tool welding, spin welding, ultrasonic welding, induction welding, and infrared welding. Welding is carried out in successive passes in order to completely fill the bevel. In order to equalize as much as possible the stress that will occur during cooling, it is recommended whenever possible to weld in a double bevel, ensuring that the rod is added alternatively on each of the two sides of the bevel until completely filled. Items produced from all non-reinforced grades of Solef PVDF can be easily assembled using standard welding methods such as hot air welding with welding rod, polyfusion, heat-sealing, ultrasonic, vibration, friction, dielectric heating (high frequency) or solvent bonding. While Solef PVDF can be welded to other types of PVDF using the various welding techniques, the weld will have, at best, the properties of the weakest PVDF, and could be lower. In welding technique, the mating parts are heated by pressing onto a metal heater which is held at 250 - 270°C and that has been surface treated to minimize adhesion.
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