When the cutting edge of the tool is dull, then during machining
A. Continuous chips are formed
B. Discontinuous chips are formed
C. Continuous chips with built-up edge are formed
D. No chips are formed
Answer: Option C
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Dull cutting edge requires more force to perform cutting processe due to which more heat will be generated and that heat will cause the melting of material (slight melting) and that melted material welds with tools edge called as Build Up Edge.
Due to more heat develop there will be melting of machined surface and that will cause a little form of welding due to which an irregular edge will form called build up edge.