Method of manufacture of metal elements by superplastic deformation and diffusion welding

摘要

In this method, in which a predetermined pattern made of a suitable diffusion-barrier material is applied to at least one metal sheet A1, another metal sheet A2 is applied to the said pattern, the combination thus formed is arranged between at least two other metal sheets B1, B2, the edges of this stack are gripped between two half-moulds M1, M2 and it is brought to the superplastic state, the bonding of the metal sheets to each other is caused by diffusion into the regions 1 that do not contain diffusion-barrier material and their separation in the other regions is caused in order to form the cavities by inflating by means of an appropriate alternating application of pressure and of partial vacuum, a metal wire 4, which does not adhere to the metal sheets A1, A2, is placed on the said pattern of diffusion-barrier material so as to join together at least some of the regions intended to form the cavities 2. IMAGE