Welding Defects عيوب اللحام UNDERCUT نحر اللحام POROSITY بخبخة اللحام INCOMPLETE FUSION عدم انصهار اللحام OVERLAP UNDERFILL SPATTER بلى اللحام EXCESSIVE CONVEXITY EXCESSIVE CONCAVITY EXCESSIVE WELD REINFORCEMENT لحام زيادة INCOMPLETE PENETRATION & EXCESSIVE PENETRATION UNACCEPTABLE WELD PROFILES