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Thermit Welding
This process utilises the intense heat developed during the reaction between iron oxide and aluminium. When a mixture of three parts of iron oxide and one part of aluminium by weight is locally burnt with a special ignition powder a vigorous reaction takes place which proceeds rapidly through the mass, resulting in the formation of aluminium oxide and iron and a considerable amount of heat. The heat is sufficient to melt iron and oxide slag. In carrying out thermit welding the thermit mixture is placed in a refractory crucible above the pieces to be welded. The molten metal from reaction is guided to the joint to be welded by a sand mould, which is fastened around the work. By virtue of its superheat, the thermit metal melts a portion of base metal with which it comes in contact. This process is ideal for welding rails of railway tracks.
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advantages and disadvantages of locomotive boiler
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Objectives After studying this section, you should be capable to: define basic nature of plastics, differentiate between various types of plastics, define polym
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