Spiral Weld as the name applies, is a steel pipe that has a seam running its entire length in a spiral form. In the past due to the method of manufacture, Spiral Welded pipe was relegated to low pressure and structural applications. With the development of the Submerged Arc welding process, the production testing methods, it now possible to produce Spiral Weld pipe for high pressure service. Spiral Weld Mills consist of a de-coiling device (in the case of strip base material), a strip connecting welder, straightening rollers, edge preparation tools (shearing and trimming), prebending devices, a bending and cage forming system, an internal welder, an external welder (both Submerged Arc), ultrasonic testing apparatus and cutting devices in ratio to strip width and the angle of the weld in the pipe. Because of the method of the manufacture, a wide variety of diameters can be produced.