The world around us is filled with metal objects. Metals and objects vary greatly but strong and sturdy materials with varying densities and strengths prove to be very useful because of the variety of items that can be made from them.
Because these metals are hard and rigid, special techniques, methods, and instruments need to be used to bend them and give them various shapes. Some of these machines and techniques can also be seen at your local repair shop or car repair shop; while others on a larger scale are used in industry to bend and form large metal sheets, pipes and rods which will later be used in the production of airplanes, buildings, bridges, machinery, pipelines and automotive parts etc.
Some of the methods used in bending and shaping metal pipes are the induction bending method, the cold bending method, the three bending methods, the mandrel bending and winding method, etc. Sheet Metal Bending is the plastic deformation of the work over an axis, creating a change in the part's geometry.
All of these methods are different and produce different results. Induction bending, for example, is useful when a connection is not required at a bend junction and a bend must be made from a piece of pipe with minimal distortion in its shape.
Likewise, in the bend method of the mandrel, the mandrel is placed in a tube and when the mandrel rotates, it forms a bend in the pipe. In the three benders method, the pipe is placed between three benders but only the central dent puts pressure and creates a bend.
Then there is the cold bending method where heat is not applied to make bends. This method is used where a smooth solution is not needed. These and many other methods are used when metal pipes or rods need to be bent; for example water and gas pipelines.