Dry Magnetic Particles – this method involves using a variation of particle sizes to indicate different sizes of flux leakage sites. Smaller particles are more sensitive to flux leakage sites/fields and are therefore able to identify smaller defects/flaws and larger particles are able to identify larger flux leakage sites.
Wet Magnetic Particles – this technique includes magnetic particles being suspended in a substance such as water or oil. This method is more sensitive to flux leakage sites caused by defects and flaws than dry magnetic particles due to the particles being more mobile whilst in a suspended state. This method also allows a larger surface area to be covered, therefore indicating more flux leakage sites.
Magnetic particle testing is a non-destructive test method, which can be used to inspect a variety of ferromagnetic components and products. These include castings, forgings and weldments. The method is used across different industry sectors, especially when determining if a component is fit-for-service. Industries that use magnetic particle testing include, aerospace, automotive, marine, power, oil and gas, components and structures, engineering and fabrication.
TWI have used their 40 years’ of experience to develop a wide variety of non-destructive testing (NDT) techniques and have provided services within the industry related to magnetic particle testing. Examples of this work include:
As a Member of The Welding Institute you have access to our membership benefits. As an engineer, technician or personnel engaged in magnetic particle testing The Welding Institute has benefits that can support you, these include:
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Magnetic Particle Testing Training Courses
Check out our Magnetic Particle Testing – TWI Training and Examinations Insight to find out more about the courses that TWI Training and Examinations offer!