Tube Bending and Fabricating - Cold Drawn
Aside from the heat created by friction in drawing, tubes are drawn at room temperature. Drawn tube products are offered in a wide range of metals through use of separate functions.
First, straight lengths in copper and brass can be redrawn in outside diameters from 1/8" to 3-1/4". Wall thicknesses in these redraws can be produced from thicknesses from 0.010" to 0.260". In the case of brass, annealing to eliminate work hardening is an integral part of the process. It is important to note that a lubricant is used in drawing.
Secondly, tubular products can be bent, flared, expanded, threaded, reduced or coined from copper alloys as well as aluminum, steel and stainless steel. Specific fabricators specialize in tooling and production geared toward high volumes.
An accepted process of fabricating is hydroforming. By use of water pressure, prebent tubes are expanded into dies to desired configuration.
The parts generated from these operations are used in plumbing, musical instruments and welding torch tips. Industrial and automotive distributors are major consumers of these products.
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