T.O. 33B-1-1Glossary 32FAYING SURFACE: The surface of a piece of metal (or a member) in contact with another to which it is or is to bejoined.FBH: Abbreviation for flat bottom hole.FERRITE BANDING: Parallel bands of free ferrite aligned in the direction of working. Sometimes referred to asferrite streaks.FERROMAGNETIC MATERIAL: Materials that are strongly attracted by a magnetic field. Iron, steel, nickel, andcobalt are included in this category. Permeability is much greater than one, and is effected by the applied magneticfield. Such materials exhibit hysteresis behavior.FERROUS METALS: Containing iron, such as steel, stainless steel and cast iron.FFD (RT): Film focal distance; distance between film and tube target.FIBER (FIBRE):(1) The characteristic of wrought metal that indicates Directional Properties and is revealed by the etching of alongitudinal section or is manifested by the fibrous or woody appearance of a fracture. It is caused chiefly by theextension of the constituents of the metal, both metallic and nonmetallic, in the direction of working.(2) The pattern of preferred orientation of metal crystals after a given deformation process, usually wire-drawing.FIBROUS FRACTURE: A fracture where the surface is characterized by a dull gray or silky appearance. Contrast withcrystalline fracture.FIBROUS STRUCTURE:(1) In forgings, a structure revealed as laminations, not necessarily detrimental, on an etched section or as aropy appearance on a fracture. It is not to be confused with the “silky” or “ductile” fracture of a clean metal.(2) In wrought iron, a structure consisting of slag fibers embedded in ferrite.(3) In rolled steel plate stock, a uniform, fine-grained structure on a fractured surface, free of laminations orshale-type discontinuities. As contrasted with part (1) above, it is virtually synonymous with “silky” or “ductile”fracture.FIELD, BIPOLAR (MT): A longitudinal field within a part having two poles.FIELD, CIRCULAR (MT): The magnetic field surrounding any magnetic conductor or part resulting from the currentbeing passed through a central conductor or the part.FIELD COIL (ET): The coil generating the magnetic field that produces eddy currents in the part being tested.FIELD INDICATOR (MT): A device for indicating the amount of magnetism in a part.FIELD, LEAKAGE (MT): The field that leaves or enters the surface of a part at a discontinuity or change in sectionconfiguration.FIELD, LONGITUDINAL (MT): A field created by a coil shot or cable wrap and in which the flux lines traverse thepart essentially parallel with its longitudinal axis. A localized field, on the surface of a part, traversing from one leg ofa yoke or probe to the other.
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
