Heating expansion bolts

Heating expansion bolts

Expansion or casing joint bolts are used to produce high-strength connections for housings in turbines, to secure wind turbine hubs and for many other applications in large-scale system engineering.

Using a central borehole in the bolt into which a slim inductor is inserted, the bolt is heated and expands. It is tightened while it is hot and then shrinks as it cools. The end result is a securely fastened bolt at the correct torque. Fastened bolts can also be removed via the same process.