The magnetic particle inspection method or magnetic particle inspection method is another non-destructive inspection method used to detect surface defects. In this method, a magnetic current is applied to the surface of the material to be examined. Defects on the surface generate a leakage current against this magnetic current, depending on their position. Meanwhile, ferromagnetic powders are sprinkled on the surface of the material being examined. These dusts are attracted by leakage currents and collected over the faulty areas. In this way, surface defects are revealed. For this method to work, the material must be ferromagnetic.
The application steps of the magnetic particle inspection method are as follows: pre-cleaning, if necessary demagnetizing the material, applying the magnetizing current, pouring ferromagnetic powders, examining, evaluating and preparing the report.
If a notch is made at any point of the magnet, the magnetic force lines travel along the notch and continue on its path. This is because the electric current prefers ways that are less resistant to itself. If some iron powder is poured at the point where this notch is opened, there will be magnetization in this area and the iron powders will cause the electric current to pass. Magnetic particle inspection method works according to this principle. The remaining parts of the iron powder on the material will show the defective areas of the material.
Standards for Magnetic Particle Inspection
Magnetic particle inspection method is applied for crack and error checks of all materials and welding seams on or near the surface that can be magnetic.
Today, there are many test and inspection organizations that apply and evaluate the magnetic particle inspection method or magnetic particle inspection method. What is important is that these studies are carried out by the MT9712 and MT7477 certificated mechanical engineers in compliance with TS EN ISO 473 Nondestructive testing - NDT personnel qualification and certification - General specifications standard (previous TS 1 EN 2 standard).
In order to ensure reliable and healthy results of magnetic particle inspection, the procedures must be carried out in accordance with the standards. The standards used in the implementation of this method are as follows:
- TS EN ISO 9934-1 Non-destructive testing - Magnetic particle inspection - Part 1: General principles
- TS EN ISO 9934-2 Non-destructive testing - Magnetic particle inspection - Section 2: Detection media
- TS EN ISO 9934-3 Non-destructive testing - Magnetic particle inspection - Part 3: Equipment
- EN 1369 Castings - Magnetic particle inspection
- EN 10228-1 Non-destructive testing of forged steels - Part 1: Magnetic particle inspection
- TS EN ISO 10893-5 Non-destructive testing of steel tubes - Part 5: Magnetic particle inspection of seamless and welded ferromagnetic steel tubes for the detection of surface defects (previous TS EN 10246-12 standard)
- TS EN ISO 3059 Non-destructive testing - Penetrant inspection and magnetic particle inspection - Inspection conditions
- TS EN 1330-7 Non-destructive testing - Terms - Part 7: Terms used in magnetic particle inspection
- TS EN ISO 17638 Non-destructive testing of welds - Magnetic particle inspection
- TS EN ISO 23278 Non-destructive testing of welds - Inspection of welds with magnetic particles - Acceptance levels
Very large magnetizing currents may be required for large-size materials or components. In addition, the roughness of the material surface to be examined is a factor that negatively affects the result. If there is coating or paint on the surface, its thickness also affects the examination results negatively.
our organization TÜRCERT Technical Control and Certification Inc.provides non-destructive testing services with magnetic particle inspection services with a competent manager and employee staff and a strong infrastructure.