With the increasing demand for quality products and accessories, the quality control of the welding area becomes an important level after the product or the component is formed. In the face of the pipe inside or difficult to reach the complex space needs inspection, proper inspection techniques and testing methods to avoid the emergence of sub-optimal and defective products for the enterprise to restore huge economic losses and social impact. Direct Visual Inspection (RVI) is an effective method of inspecting the integrity of steel, aluminum and titanium structures for welding; it is possible to determine such weld defects as cracks, imperfections, slag inclusions, incomplete sidewall welds, leaks, Handheld industrial video endoscopes allow quick and easy inspection of weld surface quality, providing clear and complete endoscopic image and video data storage; welding residues, bead quality and color are all life-like.