Non-destructive test
Destructive test
Non-destructive and destructive
Performance test
Visual inspection
Pressure test
Stethoscopic test
Magnetic particle test
Preparation, welding, finishing
Raw metal, welding, finishing
Welding, finishing, transportation
Finishing, transportation, marketing
Semi-destructive test
Visual inspection test
Before welding stage
During welding stage
After welding stage
Finishing welding stage