A Quality Engineer in sheet metal ensures product quality from raw material to finished goods, involving inspections (visual, dimensional), implementing QMS (like ISO 9001, SPC), root cause analysis (8D, 7 QC Tools), process improvement (Lean Six Sigma), collaborating with production/design, and managing documentation for customer/internal compliance, using tools like CMM/Vernier calipers for precise checks on bends, cuts, and assemblies.