What is necessary for effective measurement using a fillet gauge?

For effective measurement using a fillet gauge, it is essential that the gauge touches both sides of the weld. This contact allows the gauge to accurately measure the size of the fillet weld, which is vital for ensuring that it meets the specified design and quality standards. By touching both sides, the gauge can provide a true representation of the weld's leg dimensions and throat size, which are critical factors in determining the strength and integrity of the weld.

When the gauge only touches one side, it could lead to inaccurate readings or misinterpretation of the weld's actual dimensions, thus potentially compromising the quality of the weldment. The reliability of measurements is paramount in welding inspections, making the requirement for both sides contact a key principle in using a fillet gauge effectively.