Induction bending is also called high-frequency bending, incremental bending or hot bending. In this process, the pipe is heated using induction. For this purpose, the pipe is passed through an induction ring. This induction ring heats the pipe, creating an annular, narrow hot band.
The material is held on one side by a clamp set to the desired radius, which is connected to a freely rotating arm. The material is passed through the inductor from behind by a precise drive, causing the part weakened by heating to form into a curve at the set radius. The formed part is then cooled with water or air or simply in ambient air. This fixes the new shape. This continuous forming process is almost fully automated on Cojafex machines from the beginning to the end of the bend. Induction bends find their way to the following industries:
- Petrochemical
- Chemical
- Power Generation (conventional and nuclear)
- Oil and gas (incl. expansion joints)
- Compressor and pump stations (fluids and gasses)
- Offshore
- Shipbuilding
- Construction
65 years of experience.
Thanks to Cojafex bending technology, basically any material, which can be inductively heated, can be bent. Materials that are commonly inductively bent are:
| Carbon steels | Low alloyed steels |
|---|---|
| High alloyed steels | |
| Fine grain steels | |
| Stainless steels | Austenitic |
| Martensitic | |
| Ferritic | |
| Duplex | |
| Other materials | Special alloys |
| Cladded pipe, with corrosion resistant alloys (CRA) | |
| Aluminium | |
| Titanium |
Examples of steels routinely bent for various industries on a Cojafex induction pipe bending machine:
| Offshore | Duplex/Super Duplex/Clad pipe |
|---|---|
| Power | P91 / P22 / WB36 / P92 |
| Pipeline | API 5L X52 – X100 |
| Petrochemical | A106 Grade.B / Grade.C / P1/ P9, A312 TP304, TP316 |
Cojafex is the specialist in induction bending machines.
- Cost efficiency. Straight material is less costly than standard components (e.g. elbows) and bends can be produced faster than standard components can be welded.
- Elbows can often be replaced by larger radius induction bends, reducing friction, wear and required pump capacity.
- Induction bending reduces the number of welds in a system.
- No welds at the critical points thanks to the tangents.
- Less non-destructive testing, saving cost.
- Induction bends are stronger than elbows with uniform wall thickness
- Stock of elbows and standard bends can be greatly reduced.
- Straight pipe is more readily available than elbows, reducing time to market
- Induction bends can be made from the same base material as the straight pipe.
- Induction bending does not need bend dies or mandrels. A simple clamping/ inductor set covers a wide range of radii and wall thicknesses.
- Induction bending process is a clean process. No lubricants necessary.
We can support you by providing additional drawing and/or engineering capacity, but also by taking care of the entire process from the very first concept to the complete final product.
Feel free to contact us. We will be happy to talk to you.
Interested in our services?
sales@cojafex.com