Hot Isostatic Pressing
Page break separator
2018 TTI Group | all rights reserved

Hot Isostatic Pressing
Remove porosity
Page break separator
Use the HIP process for cladding and joining parts - expect stronger bonding, improved density of sprayed coatings and welds, plus reductions in net component costs

In today’s market, re-casting components is not financially viable. HIP’ing may be used to recover castings with microporosity and voids.

HIP achieves zero porosity in PM parts and leads to enhanced mechanical properties, cost reductions and enhanced design possibilities.

Lower scrap rates:

Remove casting voids
B Ltd is a large UK foundry making parts for a large UK defence contractor.

They were manufacturing high value weapon cradles from L169 aluminium alloy. Prototypes had revealed that the cradle castings contained microporosity. Porosity often leads to component failure, so expensive 100% checks are implemented, and any found are rejected - the mechanical properties of components can be significantly affected (especially fatigue resistance).

Unable to eliminate this problem by varying their casting practises B Ltd were going to encounter high scrap rates when manufacturing these parts. B Ltd asked TTI for help. TTI developed a HIP cycle and jigging arrangement for B Ltd that eliminated porosity in these castings without distortion of the parts. Expensive re-melting of scrapped parts was thus avoided.

Because of the lead time that B Ltd had committed to with their client, adding HIP to the process route meant that the manufacturing programme was now very tight. In order to help B Ltd meet its commitments, TTI laid on extra shifts to process the parts and collected and delivered castings twice a week.

This co-development programme led to B Ltd delivering 100% reliable parts, and the need for 100% testing avoided for the client.