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dopo un ulteriore lavorazione meccanica, si ricavano:
the pieces are obtained through electric upsetting only in the middle of the bar, remaining cold, therefore, the ends of it. after a further mechanical operation, it is possible to obtain:
materiali duri e fragili si fratturano spesso in superficie durante i primi passaggi di lavorazione meccanica.
hard, brittle materials often get fractured at the surface during the first mechanical preparation steps.