Hydroforming, otherwise known as the SAAB fluid forming method or simply Fluidforming, was developed in the 1950’s as an extension of the rubber pad forming method (referred to under such names as Guerin, Verson,Wheelon, Marform methods). Both methods were developed for industries with low volumes and high varieties of relatively thin gauge sheet metal formed parts,such as in the production of aircraft components. And again both methods were similar in that they had the advantages of low tooling (and tooling proving) costs and, due to their inherently better control of metal movement, permitted more “severe” forming than conventional tools thereby also enabling more complex shapes to be produced whilst maintaining finished part integrity.