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(1) a mated plastic parts to be welded was brought into contact with a metal plate, having high melting point than that of the materila of plastic object, to make the contact surface of pvc components infuse:
(2) after such infusion, the thermal metal plate is removed for giving pressure upon both upper and lower components to infuse the contact surface between. this method is extensively applied in industries as the result of its smiple operation, particularly for themoplastic.
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