Visual inspection is often the most cost-effective method, but it must take place prior to, during and after welding. Many standards require its use before other methods, because there is no point in submitting an obviously bad weld to sophisticated inspection techniques. The ANSI/AWS D1.1, Structural Welding Code-Steel, states, “Welds subject to nondestructive examination shall have been found acceptable by visual inspection.
Visual inspection requires little equipment. Aside from good eyesight and sufficient light, all it takes is a pocket rule, a weld size gauge, a magnifying glass, and possibly a straight edge and square for checking straightness, alignment and perpendicularity. In visual testing we perform visual inspection and Ultrasonic Thickness gauging 1.In visual inspection we visually find the defects (cracks, corrosion, pitting ect.) .