Which property of copper makes it suitable for chill strips?

• A. Electrical conductivity
• B. Thermal conductivity
• C. Magnetic permeability
• D. Density

Answer: (B)

Heat transfer is what matters here. Chill strips are used to pull heat away from the welded area so the metal cools and solidifies quickly, which helps control the weld bead and reduce distortion. Copper’s high thermal conductivity means heat moves rapidly from the hot weld zone into the strip and then dissipates into the surroundings. This makes copper an effective heat sink for rapid cooling.

Electrical conductivity is not the factor being leveraged in this context—it's about how well copper conducts heat, not electricity. Magnetic permeability is negligible for copper and doesn’t influence cooling, and density doesn’t determine how well a material can remove heat.