Which measurement tools are used to verify weld dimensions, and how are they used?

• A. Calipers measure external dimensions; micrometers measure thickness; fillet gauges measure leg length and throat; compare to drawing.
• B. Rulers measure length; protractors measure angles; tape measure measure circumference.
• C. Calipers measure temperature; micrometers measure weight; fillet gauges measure length.
• D. Jump rods measure gaps; gauges measure color; calipers measure density.

Answer: (A)

Measuring weld dimensions relies on using tools that give direct, accurate readings of the weld itself and then comparing those readings to the drawing or code requirements. Calipers are good for external dimensions of the weld bead, such as length and width, while micrometers provide higher-precision thickness measurements where needed. Fillet gauges are specifically designed for fillet welds and let you quickly determine the leg length and throat size by matching the weld to gauge references. After taking these measurements, you verify them against the drawing to ensure the weld conforms to the specified tolerances.

Other tools don’t fit as well: rulers or protractors lack the precision for tight weld tolerances, a tape measure isn’t suitable for accurate weld dimensions, and tools intended for temperature, weight, circumference, or color don’t measure the physical dimensions of a weld. The right combination—calipers, micrometers, and fillet gauges—directly targets weld size and shape and supports proper acceptance or rejection based on the drawing.