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introduction principle types scope classification methods deformation types of coil equipments advantages materials types of current magnetizing current penetrate developers zyglo testing applications visual inspection accoustic emmision quality defect application manufacturing of plastic compound powder metraullurgy plastics electromagnetic forming jigs and fixtures explosive forming sand moulding types of pattern die casting cup[ola furnance bending die and punch assembly compoun die deep drawing piercing progressive die blanking presses rolling tube drawing forging hot and cold working