🔍 Key Concepts

• Surface vs. subsurface flaws and which tests can reach below the surface • How material type (stainless steel, non-magnetic/low magnetic) affects certain test methods • Which methods require the defect to be open to the surface to work

💭 Think About

• Which of these methods can detect flaws that are completely enclosed within the metal, not open to air? • How does stainless steel’s magnetic behavior influence the effectiveness of magnetic particle testing? • Which method is commonly used to inspect the internal structure of thick metal shafts or welds?

✅ Before You Answer

• Confirm whether the method works only on surface-breaking defects or also on internal defects • Check if the method requires the metal to be magnetic/ferromagnetic • Verify which methods are typically used for internal voids in solid metal parts like shafts and heavy welds