High accuracy of shape and close tolerances

The induction bending process makes it possible to shape steel pipe with a high degree of accuracy. Induction bending is a technologically advanced and largely automated process in which the pipe is gradually bent in consecutive narrow zones heated by an inductor ring. The bending force acts axially on the pipe, whose front end is clamped to a pivoted arm. Set to the desired bending radius, this bending arm describes a circular arc around its pivot point. Under the effect of the radial thrust applied to it, the pipe automatically follows this curve.

The straight pipe to pipe bend "transformation" takes place on one of the world's most efficient pipe bending machines, which uses the principle of partial inductive heating under precise temperature control. The machine is equipped with two bending arms to accommodate the wide variety of application-oriented specifications for the end product.

The machine's powerful design permits bending across small radii even in the case of large-diameter and thick-walled pipe, and in ferritic and austenitic materials alike.

On the other hand, extremely large bending radii of up to several hundreds of metres can also be realised. Finally, the machine can also bend forged pipe fittings.

All process steps - from tendering and production planning through to induction bending control and all associated quality assurance measures - are computer-assisted via an integrated EDP system.

Bending a 40" large-diameter pipe