Flame Hardening

What is the primary method used in flame hardening?

• Heating with a high-temperature flame and then quenching

• Cooling the metal in a controlled environment

• Applying a chemical treatment to the surface

• Exposing the metal to high pressure

Which materials can flame hardening be performed on?

• Mild steels, alloy steels, medium carbon steels, and cast iron

• Plastics and polymers

• Glass and ceramics

• Wood and composite materials

What is the result of reaching the austenization temperature in flame hardening?

• The material becomes brittle

• The entire material melts

• The core remains unchanged and soft

• The material loses its magnetic properties

What gases are commonly used in the flame for flame hardening?

• Argon and neon

• Carbon dioxide and helium

• Hydrogen and nitrogen

• Oxygen and acetylene, sometimes propane

What is a benefit of flame hardening?

• Enhanced transparency

• Reduced weight

• Increased electrical conductivity

• Improved wear resistance

What is a disadvantage of flame hardening?

• Increased electrical resistance

• Decreased melting point

• Color change of the material

• Increased fire hazard

How does induction hardening differ from flame hardening?

• Induction hardening uses electromagnetic induction instead of an open flame

• Induction hardening can only be used on non-metallic materials

• Flame hardening is more precise than induction hardening

• Flame hardening can achieve higher temperatures than induction hardening

Which of the following is not a benefit of flame hardening?

• Short processing time

• Less distortion

• Cost-effective

• Increased flexibility