A Magnetic Flaw Detector, also known as a Magnetic Particle Inspection (MPI) instrument, is used in the Magnetic Particle Testing (MT) method, which is a non-destructive testing technique. The purpose of a Magnetic Flaw Detector is to inspect ferromagnetic materials for surface and near-surface defects.
In Magnetic Particle Testing, the material being inspected is magnetized using a Magnetic Flaw Detector. The instrument generates a magnetic field by passing an electric current through a coil or by using a permanent magnet. The magnetic field causes a magnetic flux to flow through the material.
بعد, fine magnetic particles, either in dry or wet form, روی سطح مواد مغناطیسی اعمال می شوند. These particles are typically iron-based and have high magnetic permeability. The particles adhere to the surface due to the presence of magnetic field leakage at defect locations.
The Magnetic Flaw Detector is then used to assess the presence of defects. It typically consists of a power supply, magnetizing unit, particle dispenser, and a means to visualize the particles. The instrument may use various techniques such as continuous magnetization, residual magnetization, or magnetic field direction changes to enhance defect detection.
When the magnetic particles are applied to the surface, they accumulate at defect locations, ایجاد نشانه های قابل مشاهده
The Magnetic Flaw Detector allows the inspector to observe and evaluate these indications, providing information about the size, شکل, and location of potential defects. This information helps in assessing the integrity and quality of the inspected material.
Magnetic Particle Inspection is commonly used in industries such as manufacturing, خودرو, هوافضا, تولید برق, و نفت و گاز. It is an effective method for detecting surface and near-surface defects in ferromagnetic materials, making it useful for quality control, نگهداری, و بازرسی های ایمنی.
