What is the measurement method for confirming a weld's throat size?

The measurement method for confirming a weld's throat size is appropriately identified as the fillet gauge measurement. This technique specifically utilizes a tool designed to measure the throat thickness of fillet welds, providing a direct assessment of their dimensions according to specified standards. The throat size is crucial as it directly influences the strength and performance of the weld, making accurate measurement essential for ensuring that the weld meets the relevant code or specification requirements.

While visual inspection can offer some insights into the weld's overall appearance and surface quality, it is not sufficiently precise for accurately determining throat size. Caliper measurement is a versatile tool but may not provide the specificity required for a consistent throat measurement on welds, particularly those with varying geometries. Ultrasonic thickness measurement, though useful for evaluating material thickness or detecting flaws, is not typically employed for assessing the throat size of welds. The fillet gauge, therefore, stands out as the most effective and standard method for this particular measurement.