1. Weld surface defect inspection. Check the welding quality of surface cracks, incomplete penetration and leakage of welds. 2. Endoscopy. Check the surface for cracks, peeling, pulling wires, scratches, pits, bulges, spots, corrosion and other defects. 3. high-definition industrial endoscopes status check. When some products (such as worm gear pump, engine, etc.) are in operation, endoscopic...