Brazing without tools

A method for assembling a set comprising an inner wall, a shrouded outer wall and an intermediate element, each presenting substantially circular sections, the shrouded outer wall presenting a shape substantially complementary to a shape of outer and inner surfaces of the intermediate element, and whose inner surface covers the outer surface of the intermediate element,

• wherein the method comprises at least one step of placing at least one brazing sheet, whose melting temperature is lower than melting temperatures of other elements of the set, over at least one assembly surface in contact with another assembly surface,
• at least one step of heating, by means of a furnace and without tooling, a set comprising at least one of the outer or inner wads and the intermediate element between which is interposed at least one brazing sheet so as to fix the outer or inner wall by brazing on the intermediate element, wherein the heating is up to a melting temperature of the brazing sheet and lower than a melting temperature of the at least one outer or inner wall and the intermediate member, and
• wherein the method comprises a step of radially expanding the inner wall, by means of an expansion tooling of an assembly device, in such a manner that the inner wall comes into contact with and takes the shape of the inner surface of the intermediate element.