1. Compression Bending is a process whereby pipe or tube is bent to reasonably tight radii, usually without the use of mandrel or precision tooling. It is accomplished by clamping the workpiece behind the rear tangent point and then by means of a rotary arm arm rolling or compressing the material around and onto a die. If a tight bending radius is not required and the geometry of the bend shape is not critical, the compression bending method is the simplest and most economical process.
2. Draw Bending is used for tight radii and for thin wall material.  Advantages include maximum control of wall thinning and ovality.  Draw bending usually involves the use of mandrel tooling.                                                                                                        3. Coiling is an art unto itself.  Tight radius coils are often made on draw bending equipment or for smaller diameter pipe and tube, by winding the material onto a suitable cylinder to form the coil drum.  In most cases, coils are made by machinery specifically designed for this purpose.                                                                        4. Aluminum Bending is difficult because of the material itself. The real problem in bending is due to the various tempers of the aluminum alloys.  Most aluminum pipe used is quite hard.  Also, the material continues to age-harden after production and so while it is possible to bend T6 material, the older it is, the tougher it is to bend.  Quite often, the material will break rather than bend and in some, springback occurs.

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