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In which of the following metalworking process, the volume of the material is not constant?

In which of the following metalworking process, the volume of the material is not constant? Correct Answer Machining

In machining, the material is removed from the original component with the help of tool, the cutting sectioning and trimming is part of machining process. Whereas, in rest of the methods, the volume of the element remains the same.

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