During the 20 year history of the tube hydroforming industry, much discussion and debate has surrounded the 'proper' process to use.

The conventional option most familiar is High Pressure Hydroforming or HPH.

Another process that actually started production before HPH for making structural parts is Low Pressure Hydroforming or LPH.

A recent development is HydroDieForming or HDF which is able to deliver desirable benefits of each process, but is distinctly

The process used is the key to or can affect many considerations including:

• Part functional feasibility
• Cost feasibility
• Part design features
• Material & formability
• Equipment, tool and part cost

Looking at a part for example that was not feasible with HPH reach a totally different conclusion with HDF. The desirable features can be achieved, but without disadvantages. This is an important consideration since even parts that were functionally feasible with HPH can be more economical to make with the HDF approach.