Induction Shrink Fitting

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Shrink fitting  is a very simple process that takes advantage of the tendency of materials to expand when heated. Usually, shrink fitting involves inserting a room temperature component into another component that has been heated. The room temperature component is able to be inserted with relative ease because the heat has caused the mating surface of the second component to expand slightly. After insertion, the components are allowed time to cool. This cooling causes the mating surface to contract around the first component and form a non-permanent mechanical bond.

Each method of securing parts in an assembly has unique advantages. In the case of shrink fitting, parts made from any metal can be assembled: steel to steel, steel to copper, aluminum to steel, magnesium to steel, etc. Shrink fitting is done at a relatively low temperature which mitigates changes in the metallurgical structure and avoids oxidation. No cleaning is required after assembly because of this. Shrink fitting is also able to be reversed easily and without damaging the components by selectively heating the outer component causing it to expand again.