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High frequency welding machines are the welding machines that are usually used for plastics based parts as the most commonly applied work field. With the high frequency welding machines’ efforts, the resulted join could be very strong for the application since it is often required to have the original hardness of the joined materials.
The work piece materials on the high frequency welding machine can be heated and pressured to the melting point for further fusing, so there is no outside heart, because the heat is generated within the work piece materials instead. Later, during the cooling procedure of the high frequency welding machine, there will be continued pressure, so the materials would go fused and the weld is thus finished.
Plastics welding procedures are similar to metal welding, while metal welding involves more different steps and varieties in the field. For instance, in the metal welding field, resistance seam welding is a popular metal welding method in which the welding machines are producing a weld at the faying surfaces of two similar metal materials. During the resistance seam welding process, the seam may be a butt joint and is an automated process. It is different from flash welding in that flash welding welds the entire joint at once while seam welding forms the weld progressively and starts at one end. Compared to the plastics welding by the high frequency welding machines, the melting of the plastics and the cooling process are relatively simple as the welding machines need not to deal with too many metal material issues.
Regarding the cooling of the plastics melt parts, there are also many cooling issues in the metal welding processes that are critical to the final outcomes of the weld quality, such as some variables like thickness, hardness, etc. For instance, the spot welding machine, the welding machine will make the process in which contacting metal surface points are joined by the heat obtained from resistance to the electric current, as a result, it is considered a subset of electric resistance welding. During the process, work pieces are clamped together under pressure exerted by the electrodes. Usually, the sheets are within a certain range, ranging from 0.5 to 3 mm thickness.
For those who need to be welt by the high frequency welding machines, the plastics materials are generally not the raw materials to be welt. Normally they have to be processed in advance. A hopper installed on the plastics extrusion machines would be like a funnel, but instead of receiving the liquid the hopper is for plastics pellets, resins and the masterbatches as critical additive materials. After the collection of the plastics raw materials, they will be blended altogether started at the head of the turning screw. Then the liquid state plastics will be with the barrel and further molten during the process. At the end, the extrusion die will shape the final shapes of the extruded plastics materials. This extruded material, for instance, some PVC plastics, will be further processed by things like high frequency welding machines with several processes.
With the high frequency welding machines, the PVC components could be bonded into some PVC film materials, so that the conjoined plastic parts are firmly integrated, yet there are many different kinds of measures to achieve the plastics melting and welding. There may be physical methods such as friction welding, hot air welding, and ultrasonic welding. On the other hand, there may be chemical measures such as the well known cyclohexanone method, which is specifically designed for bonding tube materials. Both physical and chemical methods are useful for the plastics melting, yet the most suitable ways for the welding are dependent on the plastics materials, conditions, and the final applicability. Among all the plastics welding methods, high frequency welding is one of the most favorite methods in the industrial sector.
The reasons why this welding method is so preferred by industrial insiders are mainly four. These four reasons are critical to the processing procedures. First of all, the fast welding working cycles is the best advantages to the manufacturers. Second of all, the inexpensive toolings of the high frequency welding machines are favored by manufacturers with budget issues. Thirdly, the clean process makes the whole working condition very neat, making benefits for all the onsite workers. Lastly, there is no subsequent drying process needed at the process of this method.
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