A HIP unit consists of a high temperature furnace enclosed within a pressure vessel. Castings or Powdered Metals are placed in a CAN (the work pieces) and heated under a uniform, isostatic pressure of inert Argon gas. This process repairs castings that have both visible and invisible adverse properties. Following Hipping, the result is elimination of internal voids (i.e. porosity) and improved microstructure. Any voids in the casting will repaired by this process.
If you seek to repair your casting, the HIP process is the route to do it. If you have critically important cast parts and require certainty of performance (e.g. for the links used in helicopter power trains) then your casting process should be completed using HIPping. This will ensure that there are no invisible, weak areas within your component.
HIP is effective with almost all materials – including metals, ceramics and plastics. HIP repaired castings have all the porosity removed. The reduced porosity of HIP’ed materials enables improved mechanical properties such as fatigue strength and increased workability. The HIP process densifies and repairs and creates a clean uniform microstructure of the casting. Examination of HIPPED parts by nondestructive testing techniques show excellent results. These characteristics are not possible with welding or casting.