Attack (HTHA) Inspection
These bubbles exert pressure and also coalesce into fissures. The growth of voids and fissures weakens the metal, which leads to a major crack. This reaction decarburizes the steel, produces micro cracks/fissures and lowers toughness of steel but may not cause a loss in thickness.
- Supports the Inspection of large and wide areas
- Provides accessibility and convenience as external access is required only on one side (Opening of equipment or removal of the catalyst is not required)
- The depth of attack can be estimated
- Deep expertise required in interpretation
- Ignitial micro level degradation (Decarburization) cannot be estimated