Visual Testing (VT) is the first and most important method for evaluating weld quality. It is used before, during, and after welding to examine weld surfaces, profiles, preparation, and overall workmanship.
During direct visual inspection (DVT), the inspector uses proper lighting, gauges, mirrors, and magnifiers to identify visible discontinuities such as undercut, porosity, cracks, incomplete fusion, poor penetration, and surface irregularities. Remote visual testing (RVT) is performed using cameras, borescopes, or drones to inspect welds in areas that are inaccessible or unsafe to approach.
VT helps identify welding problems early, reducing rework and preventing defects from progressing into more serious structural issues. Because it is fast, cost-effective, and applicable to every material and welding process, VT forms the foundation of any weld quality program.
Visual welding inspection supports compliance with AWS, ASME, and API requirements and is essential for fabrication shops, field work, facilities maintenance, and quality-control programs.
