Method and installation for manufacturing a metallic component and component obtained by said method

A method for manufacturing a metallic component comprises the steps of assembling different metallic parts of said component, and subsequently fixing the assembled parts by heat treatment. According to the invention, said heat treatment includes the steps of placing the assembled parts in an adapted enclosure, associating heater means with said assembled parts, and subsequently switching on said heating means within said enclosure in order to heat said assembled parts to a predetermined temperature at which mechanical fixing of said assembled parts occurs. The method is preferably used in the manufacturing of heat exchangers.