Magnetic Particle Testing (MT) is a nondestructive method used to detect surface and slightly subsurface discontinuities in ferromagnetic materials, such as carbon steel. This technique is widely used in structural welding, pipeline fabrication, heavy equipment repair, and industrial construction.
During MT, a magnetic field is applied to the weld and surrounding heat-affected zone. When the field encounters a crack or discontinuity, a magnetic flux leakage occurs. Fine iron particles are then applied to the surface, gathering at the defect and revealing its size, shape, and location.
MT is highly effective for detecting:
Because MT provides clear visual indications and quick results, it is ideal for field and shop environments. It supports code compliance under AWS, ASME, and API standards and provides reliable weld quality verification on carbon steel components in nearly every industry.
