õhukeseseinaliste metalltorude vormimise meetod alla sulamistemperatuuri kuumutatud toorikule sisemise surve avaldamiseks gaasi kasutades, mille tulemusena toorik matriitsi vormi omandab (vrd vedelik-toruvormimine), a method of die forming in which a metal tube is heated to a pliable state, near to but below its melting point, then pressurized internally by a gas in order to form the tube outward into the shape defined by an enclosing die cavity (compare: tube hydroforming)