What tool is used to remove rust and pitting?

• A. Hammer
• B. Needle gun
• C. Chisel
• D. Wire brush

Answer: (B)

Removing rust and pitting effectively requires a tool that can reach into surface cavities and aggressively dislodge embedded corrosion. A needle gun (needle scaler) uses many slender needles that rapidly vibrate and strike the surface, breaking up rust and scale and pulling it out of pits. This penetrating action is essential for cleaning pits where rust has formed deep, because a simple brush or hammer can’t reach those spaces. A hammer is not designed for removing rust and can distort the metal. A chisel would gouge and damage the surface rather than clean it. A wire brush can remove loose rust on flat areas but isn’t capable of thoroughly cleaning embedded rust in pits. So, for removing rust and pitting, the needle gun is the best choice.