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Hot gas welding, also known as hot air welding, is a plastic welding technique using heat.A specially designed heat gun, called a hot air welder, produces a jet of hot air that softens both the parts to be joined and a plastic filler rod, all of which must be of the same or a very similar plastic.
Various forms of ultrasonic inspection are used for plastic welds. Plastics have higher attenuation and a lower sound velocity compared to metals which can make these techniques more challenging. [2] In 2010, a joint European project, TestPEP, was started to develop and validate ultrasonic NDE techniques on plastic welded pipe. [5]
Hand welding is a technique in which the weld rod is applied to the joint by the welder directly. This is also referenced as free-hand welding or fan welding. [1] The hot gas torch is maneuvered in one hand to heat both the weld rod and joint surfaces in a pendulum manner in quick succession.
Radio-frequency welding, also known as dielectric welding and high-frequency welding, is a plastic welding process that utilizes high-frequency electric fields to induce heating and melting of thermoplastic base materials. [1] The electric field is applied by a pair of electrodes after the parts being joined are clamped together.
Implant induction welding is a joining method used in plastic manufacturing. The welding process uses an induction coil to excite and heat electromagnetically susceptible material at the joint interface and melt the thermoplastic. The susceptible material can be contained in a gasket placed between the welding surface, or within the actual ...
Depending on different interactions between laser and thermoplastics, four different laser welding techniques have been developed for plastic joining. CO 2 lasers have good surface absorption for most thermoplastics, hence they are applied for direct laser welding and laser surface heating. Through transmission laser welding and intermediate ...
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