Test Lab, NDT Weld Training Course Institute India Bangalore | Trinity NDT

De-magnetization Services. Checking Residual Magnetic Field.

Removing Residual Magnetism. Demagnetizing Shafts, Gears, Welds & Ferromagnetic Steels.

Experts in Demagnetising Toughest Residual Magnetic Fields. Serving 1500+ Customers. World Class NDT Services in India.

Demagnetization Services. Experts in effectively removing Residual magnetism on Shafts, Gears, Ferromagnetic Welds. Facility to Measure residual Field.

De-magnetization Service by Trinity NDT
De-magnetizing Service at Trinity NDT Labs
By virtue of process some materials will attain residual magnetism. This causes problems while using the components. For example, it is difficult to weld or do machining the parts that have residual magnetism. May also cause surface finishing issues.
Components needs de-magnetisation to bring down residual magnetism to acceptable level. This needs, experts who have keen understanding of magnetic field direction, strength, analysing properties before de-magnetisation. 
Magnetic particle inspection division of Trinity NDT Labs in Peenya Bangalore gives expert demagnetization services to customers. A Range of demagnetizing machines available. We provide de-magnetising services for the components to bringdown to acceptable magnetic field.  At our NDT Labs in Bangalore dedicated team of experts will measure and demagnetise all ferromagnetic materials. 


How to Remove Tough Residual Magnetic Fields?

Ferro materials attain magnetism which could be difficult to remove using general methods of de-magnetization. Removing residual magnetism is not easy as said. It need skilled engineers, right technique and equipment. Over two decades of experience in giving demagnetization services for our customers across India. We know better than any one else to remove tough residual magnetic fields in ferrous materials. 

We are equipped to check the residual magnetism. Calibrated Gauss meters are available. Delivering steadfast de-magnetization services. 

What is acceptable Residual magnetic Field in any material?

We do analysis of residual magnetic field, establish proper method and implement the procedure as needed. At the end of demagnetization, you can check to ensure residual field is within the allowable limits. 

After De-magnetization, residual magnetic field less than +5 Gauss for non critical components and +3 Gauss for aerospace components is acceptable 

De-magnetization - an Overview

For ferrous materials, Magnetic particle testing or magnaflux testing is used for detecting flaws. Ex: Automobile Shafts, Rotors, Blades, Gears, Sprockets, weld joints, plates, and Aircraft components. 

Parts are magnetised to find flaws, fatigue cracks during in-service inspection. During magnetic particle testing materials may attain residual magnetism. Also ferrous materials kept for prolonged periods in earth North and south direction may also store the magnetic field. Components subjected to arc welding and high amperage cables passing over the materials sometimes may magnetize materials. 

Some materials are easy to magnetize and easy to de-magnetize. Other materials may be difficult to magnetize. These may retain large amount of residual magnetism. Hysterisis curves are used to evlaluate the magnetic properties of ferro magnetic materials. 

 Mild steels usually do not retain much residual fields, thus need not be de-magnetised. 


Reasons for demagnetization

Ferro magnetic materials are subjected to magnetic fields during manufacturing, storing, handling and transporting. Such materials are detrimental for use as they may have un-acceptable residual fields. 

Reasons for de-magnetization are below. If answer for any of one or more of the following is ‘Yes’, de-magnetization is required.

  • Residual field will affect instruments sensitive to magnetic fields such as aerospace parts
  • Parts are to be plated or painted. 
  • Components 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
  • When parts are to be electric arc welded

De-magnetization Not Required

De-magnetization needs time and cost. In exceptional cases, it is not required to perform de-mag. 

For any one or more of the following, answer is ‘Yes’ then you need not demagnetize the parts.
  • 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 big structural parts, e.g. welds, 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 on a magnetic chuck

Checking Residual magnetism

Residual Gauss Meter for Measuring Field Strength
Residual Gauss Meter for Measuring Field Strength

Then, how do you know if the demagnetization is properly performed or not. Check residual magnetism using residual magnetic field meter. Calibrated magnetic field testing equipment, Instruments are available for measuring magnetic field strength post completion of demagnetization. Test report is issued specifying residual magnetic strength measured in Gauss or Tesla. 

Rely on our experts for the MPI Crack testing and de-magnetisation services from our labs at Peenya, Bangalore in India.

De-magnetization Services at Our MPI Labs

NDT Labs at Trinity NDT are NABL ISO 17025 accredited. Recognized worldwide by leading OEMs. De magnetization 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. Serves both onsite and at our Labs in Peenya, Bangalore, India. 

Send us the parts to our testing labs. Large size components are handled using 5 Tonne EOT crane. Calibrated residual gauss meters are used to check the effectiveness of demagnetization. Internationally valid test reports are issued duly signed by ASNT Level III.

Quick De magnetization Services in Bangalore

Demagnetization is a process that requires MPI testing equipment, and experienced technicians. We understand the delivery schedules of customers and mobilize resources. 

We deliver the parts within 24 hours for de magnetisation services. Call us today to know more about our world class NDT services and quick delivery schedules. Check our magnetic particle inspection services.

Comprehensive NDT and Welding Solutions

Trinity NDT Lab is a perfect place for NDT Inspections on Ultrasonic InspectionRadiography X Ray testingFPI testing – Aerospace, MPI testing, Welder Qualification & Certification servicesEddy Current sorting, inspection of heat exchanger tubes for corrosion and crack detections. 

For updates and news about demagnetization services visit Ravi Trinity NDT Blog.

Are you looking for Demagnetization services in Bangalore, we are just ready to pick you call today.