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Principle and Application of HF Welding

  • Update:19-05-2017
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    High Frequency Welding (HF) or radio frequency (RF) wel […]

    High Frequency Welding (HF) or radio frequency (RF) welding is accomplished by providing HF energy in the form of an electromagnetic field (27.12 MHz) and connecting the pressure to the surface of the material to be joined. The generator generates energy. The tool used to provide energy is called an electrode. Electric energy causes the molecules in the material to start moving, producing heat, causing the material to soften and melt together. No external heating. But in the material generated. After cooling the welding surface after maintaining the pressure, the material melts and forms a weld. The weld can be at least as strong as the surrounding material, or even stronger.

    The four important factors in the final welding results are pressure, welding effects, welding time and cooling time. These parameters can be adjusted and combined in different ways to achieve the best welding results for a particular material. The most commonly used materials for HF welding are PVC (polyvinyl chloride), sometimes referred to as vinyl and PU (polyurethane). The material may be thick or thin, reinforced or coated. It can also be plain, color or pattern.

    The main principle of HF welding is based on the electrical heating of the material to be welded. The object to be welded is sandwiched between the two metal electrodes and provides a high frequency voltage. As a result, the molecules in the material begin to vibrate and heat up. The final material will melt, and the force provided by the electrode will melt (melt) the resulting weld may be stronger or even stronger than the surrounding material.

    HF welding manufacturing of ordinary products are tarpaulins, tents, ceilings, advertising banners, water beds, inflatable boats, medical supplies, especially diaper bags, stretching structure, conveyor belts, raincoats and so on. Compared with high frequency welding, a large number of other methods (hot air, infrared radiation, laser) supply energy / heat from the outside. This means that the heat must first penetrate the material to heat the contact surface, which makes it possible to burn the top layer of the welding material.