With different NDT testing methods, we look for flaws on the inside and outside of the test subject that could potentially give out under stress and break. These NDT methods are usually used in the manufactoring process as an effective means to ensure quality of the goods, but can also be used later in the product’s lifespan to track the condition.
- Penetrant testing
- Magnetic testing
- Ultrasonic testing
- Radigraphic testing
- Corrosion depiction
- Thickness measurement
Penetrant testing(PT)
This method is best suited to look for superficial flaws, such as cracks or pores. The method is largely used for weldings and castings that are typically made from austenitic steel, to which the magnetic testing methods cannot be used on..
Magnetic testing(MT)
The method is suited for finding superficial flaws in products made out of ferritic materials.
This method is based on creating a magnetic field to the test subject. White paint acts as a contrast color to the black magnetic powder. If the space is dimly lit, a fluorescent magnetic powder method can also be administered. This way a base paint layer is not needed, thus the testing process is speeded up greatly.
Ultrasonic testing(UT)
This picture represents how an ultrasonic pulse echo is applied. Angle sounding is used to inspect weldings and direct sounding is used when inspecting basic substances or measuring thicknesses.
The method is an extremely precise instrument to determine flaws in the substances different layers, such as cracks. Circular flaws like pores can also be detected, but with less precision when compared to that of the radigraphic testing methods.
Radigraphic testing(RT)
Radigraphic testing methods reveal all kinds of flaws in the subject very clearly. In the picture example all the darker areas represent flaws that have occurred in the welding process. These areas let through more radiation, which then show off as darker areas. The flaws are categorized precisely due to their form and location.