What is End Forming? Tube end forming is the process whereby tube ends are flared, reduced machined and shaped into various configurations. In tube manufacturing and processing, tube end forming is a critical component which allows the tube to be joined as necessary to many other components. It also can be a process used to cap, seal or terminate a tube for a particular application. End forming often follows the tube bending process and in some cases can even be a part of that very same bending and forming process.