Which type of wheel is appropriate to start finishing?

• A. Flapper wheel
• B. Grinding wheel
• C. Wire brush
• D. Diamond wheel

Answer: (A)

Starting finishing means smoothing and blending a surface after rough work, without leaving deep scratches or gouges. A flapper wheel is ideal here because its many small abrasive flaps continuously expose fresh abrasive, providing a controlled, consistent cut that rounds off burrs and weld seams without the aggressive bite of a grinding wheel. It delivers a smoother, more uniform finish and generates less heat, which helps preserve the metal and reduce distortion.

A grinding wheel is too aggressive for finishing because it can leave deep scratches and heat-affected zones. A wire brush mainly cleans and deburrs and can leave wire marks or deform the surface. A diamond wheel is great for hard materials or precision grinding but is overkill for typical finishing of welds or mild steel and can be too aggressive for slow, even blending.