What is casting? Explain the types of casting processes.
Answer:
Casting is a process where molten metal is poured into a mold and allowed to solidify.
Sand Casting: Uses sand molds, suitable for large components.
Die Casting: Molten metal is injected into a metal mold under pressure.
Investment Casting: Uses wax patterns; provides precise details.
Centrifugal Casting: Rotates molds to create hollow parts like pipes.
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2. Define welding and list common types.
Answer:
Welding is a process of joining two or more metal parts by heating or applying pressure.
Arc Welding: Uses an electric arc (e.g., MIG, TIG welding).
Gas Welding: Uses a flame (oxy-acetylene).
Resistance Welding: Uses electrical resistance (spot welding).
Laser Welding: Uses laser beams for precision.
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3. What is forging? Explain the difference between hot and cold forging.
Answer:
Forging involves shaping metal using compressive forces.
Hot Forging: Done above recrystallization temperature (easier to deform).
Cold Forging: Done at room temperature (provides better surface finish and strength).
Answer:
Casting is a process where molten metal is poured into a mold and allowed to solidify.
Sand Casting: Uses sand molds, suitable for large components.
Die Casting: Molten metal is injected into a metal mold under pressure.
Investment Casting: Uses wax patterns; provides precise details.
Centrifugal Casting: Rotates molds to create hollow parts like pipes.
---
2. Define welding and list common types.
Answer:
Welding is a process of joining two or more metal parts by heating or applying pressure.
Arc Welding: Uses an electric arc (e.g., MIG, TIG welding).
Gas Welding: Uses a flame (oxy-acetylene).
Resistance Welding: Uses electrical resistance (spot welding).
Laser Welding: Uses laser beams for precision.
---
3. What is forging? Explain the difference between hot and cold forging.
Answer:
Forging involves shaping metal using compressive forces.
Hot Forging: Done above recrystallization temperature (easier to deform).
Cold Forging: Done at room temperature (provides better surface finish and strength).
