graph LR A[블록 배치] --> B[표면 처리] B --> C[맞대기 용접] B --> D[필릿 용접] C --> E[용접부 냉각] D --> E E --> F[UT 검사] F -->|합격| G[표면 마감] F -->|불합격| H[재용접] H --> F G --> I[다음 공정] style A fill:#2c3e50 style B fill:#34495e style C fill:#ff6600 style D fill:#ffa500 style E fill:#95a5a6 style F fill:#3498db style G fill:#2ecc71 style H fill:#e74c3c style I fill:#06b6d4