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free download underwater welding seminar ppt

Underwater Welding

Welding is an unavoidable process of modern engineering ? civil, electrical, mechanical, automobiles, marine aeronautical ? in all branches. It is used in fabrications and erections in infrastructures and installations. It joins metals or thermoplastics. Forming a pool of molten mass ? the weld puddle ? and allowing it to cool to become a strong joint is the basis of the process of welding. For repairing to be carried out underwater, there is a separate process. That is called un ....etc

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orbital welding ppt free download

Orbital welding first found use in the 1960 s when the aerospace industry recognized the need for a superior joining technique for aircraft hydrolic lines. The solution: a mechanism to rotate a welding arc from a tungsten electrode around a tube-weld joint. Regulating weld current with a control system automated the entire process. The result was a more precise, reliable method than manual welding.

Purpose

To provide leak proof joint between Tube to Tube sheet in Condenser in addition to Forced expansion. ....etc

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Plastics are considered to be building blocks of technology related structures of modern era. The development of polyvinylchloride, made in Germany, triggered extensive research and development in plastic fabrication work. Critical storages of alloying elements of corrosion resistance steel as well as other technological applications stimulated the use of plastic structures during the Second World War. In plastic welding smaller components are welded together to form complex structures. These structures include installation of process lines ven ....etc

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ppt
Plastic welding and spot welding - both are almost similar to each other. There is a difference noted. In plastic welding, heat is supplied through convection of the pincher tips, instead of conduction. The two plastic pieces are brought together. ....etc

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