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Tool material used in hot machining In hot machining (workpiece preheating to reduce cutting resistance), which tool material is typically used? Choose the most appropriate option.

Difficulty: Easy

Tungsten carbide
Brass or copper
Diamond
Stainless steel

Correct Answer: Tungsten carbide

Explanation:

Concept
Hot machining preheats the work to lower its strength/hardness, reducing cutting forces and tool wear. The tool must still retain strength at elevated temperature; carbide (and sometimes ceramics) are suitable choices.

Eliminations
Brass/copper and stainless steel are not cutting tool materials for such duty; diamond is used for abrasive/finishing or non-ferrous cutting but is not the standard choice here.

Final Answer
Tungsten carbide.

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