Certified Welding Inspector Practice Exam

Lack of fusion is a common defect identified during visual inspections in welding. This defect occurs when there is inadequate bonding between the base metal and the weld metal, or within the weld metal itself. During visual inspection, the absence of fusion can often be seen as a visible gap or unevenness at the joint, indicating that the welding process did not achieve the necessary heat or technique to ensure proper adhesion of the materials.

Visual inspection is primarily concerned with surface conditions and obvious discrepancies in weld integrity. Since lack of fusion can manifest as unsightly cracks or inconsistent bead appearance, inspectors are trained to recognize these signs promptly. This defect can significantly impact the strength and durability of the weld, making it critical for any welder or inspector to be vigilant in its detection.

Other choices may relate to welding, but they either do not present as directly observable issues during an initial visual assessment or are not classified as common defects. For example, excessive heat may not be visible but can lead to other issues such as warping or burn-through, while overuse of filler metal and increased weld joint thickness may not always indicate defects without further inspection or testing.