Magnetic Particle Testing (MT)

Magnetic Particle Testing (MT)

Magnetic Particle Testing (MT) is used on cut and beveled pipe ends before welding to make sure there are no parent material flaws. MT is also used by PETRO AKTIF (M) SDN BHD to detect surface cracks after grinding or machining operations.

process for detecting surface and slightly subsurface discontinuities in ferromagnetic materials such as iron, nickel, cobalt, and some of their alloys. The process puts a magnetic field into the part. The piece can be magnetized by direct or indirect magnetization.

Direct magnetization occurs when the electric current is passed through the test object and a magnetic field is formed in the material. Indirect magnetization occurs when no electric current is passed through the test object, but a magnetic field is applied from an outside source. The magnetic lines of force are perpendicular to the direction of the electric current, which may be either alternating current (AC) or some form of direct current (DC) (rectified AC).