Necking is a process to reduce the diameter of pipe material.
In general, the wall thickness of the necking section is thicker than the original thickness of the pipe. This is especially true when pressure is applied to a liquid or gas to make it pass through the pipe, as the thinner the pipe becomes, the thicker the wall thickness will be, which is advantageous in terms of strength.
It is possible to adjust the thickness of the pipe. There are various ways to process a pipe, such as tapered pipes, drawing a pipe while maintaining a certain diameter, or drawing only the middle part of a pipe.
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