NDT inspection Magnetic Test (MT)
MT is used to detect surface-breaking and sub-surface flaws in ferromagnetic materials. It cannot, however, be used to detect deeply embedded flaws, nor can it be used on non-ferromagnetic materials, such as aluminum, copper or austenitic stainless steel.
- Apply to look for cracking at heat area zone of welds.
- To detect fatigue cracking, corrosion cracking of steel structures in many thermal power plants, hydraulic power plant, bridge structure…
- MT Methods:
+ Dry magnetic powder
+ Wet magnetic powder
+ Fluorescent magnetic powder