By virtue of process some materials will attain residual magnetism. Residual magnetism causes problems in using the components. For example, it is difficult to weld or machine the parts that has residual magnetism. This may also cause surface finishing issues. Therefore, such components needs demagnetization so that residual magnetism is reduced to acceptable level. This needs, experts who have thorough understanding of magnetic field direction, strength and material magnetic properties before starting demagnetization.

 

The Magnetic particle inspection division of Trinity NDT Labs in Peenya Bangalore gives expert demagnetization services to customers in and around Bangalore, Hosur, Mysore, Mangalore, Pune and Hyderabad. A Range of demagnetizing machines available for effectively giving demagnetizing services for the components to acceptable magnetic field from our NDT Labs in Bangalore.

Well, some ferro materials attain magnetism which could be quite difficult to remove using general methods of demagnetization. Removing residual magnetism is not easy as said. It need skilled engineers, right technique and equipment. With over two decades of experience in giving demagnetization services for customers in Bangalore, Hosur, Mysore, Mangalore, Pune and Hyderabad, even tough to remove magnetic fields also are successfully demagnetized. You can outsource demagnetization services to us.

 

 

We will do the analysis of existing magnetic field, establish proper method for the process and do the procedure as needed. At the end of demagnetization, you can check to ensure residual field is within the set allowable limits. In general, less than 5 Gauss is acceptable for non critical components and 3 Gauss for critical aerospace components.

 

 

For ferrous materials, Magnetic particle testing or magnaflux testing can detect flaws. For example,  Automobile Shafts, Rotors, Blades, Gears, Sprockets, weld joints, plates, and Aircraft components. To find surface and subsurface flaws, fatigue cracks during in-service inspection. However, some materials are easy to magnetize and easy to demagnetize. But, some retain large amount of residual magnetism that could be difficult to remove.

 

• Residual field will affect instruments sensitive to magnetic fields, e.g., aerospace parts
• Components/Structures to be plated or painted because adhering particles would interfere with these processes;
• Parts are to be subsequently machined
• The part is to be re-magnetized at a lower level than the initial magnetization step
• Component tested will be moving parts. Particles of metal or magnetic particles could cause failure
• When parts are to be electric arc welded; this prevents possible arc blow

When is Demagnetization NOT Required ?

• Post cleaning is not a stringent requirement and all inspection materials need not be removed;
• The component if finished and NO external field exists
• Parts are of low retentivity, e.g. low carbon plate;
• If the material tested consists of structural parts, e.g. weldment, large castings;
• Component is to be heat treated above curie temperature
• When the part is to be re-magnetized in another direction at the same or higher level than the original magnetization;

• If the part will be magnetized anyway in a following process, e.g. held on a magnetic chuck

Measure Magnetic field post Demagnetization

Then, how do you know if the demagnetization is properly performed or not. It is simple, just measure the residual magnetism using residual magnetic field meter. Calibrated magnetic field testing equipment, Instruments are available for measuring magnetic field strength post completion of demagnetization process. Test report is issued with magnetic strength measured in Gauss or Tesla. Rely on our experts for the MPI testing and demagnetization services from our labs at Peenya, Bangalore in India.

 

About De-magnetization Services with TRINITY NDT in India

NDT Labs at Trinity NDT are NABL ISO 17025 accredited and recognized worldwide by leading OEMs. MPI Demagnetization facility is equipped to deliver the components with residual magnetic field well within the limits. Our MPI testing team are well experienced in demagnetizing tough to remove magnetic fields both onsite and at our Labs in Peenya, Bangalore, India. We also serve in Hosur, Mysore, Mangalore, Pune and Hyderabad area. Send us the parts to our testing labs. Large size components can be easily handled using 5 Tonne EOT crane. Calibrated residual gauss meters are used to check the effectiveness of demagnetization at the end and test reports are issued.