Defect analysis in welding involves identifying and assessing imperfections in welds that can affect the strength and integrity of a structure. Common defects include cracks, porosity, slag inclusions, and undercutting. Analyzing these defects typically uses methods such as visual inspection, ultrasonic testing, and radiographic testing to detect and characterize issues. Understanding and addressing welding defects is crucial for ensuring safety, compliance with standards, and the longevity of welded structures. Proper analysis helps prevent failures and improves overall weld quality.