T.O. 33B-1-1Glossary 65POWDER, DRY (MT): Finely divided ferromagnetic particles suitably selected and prepared for magnetic particleinspection.PRECIPITATE (MT): The separating of the magnetic particles from the liquid vehicle. Used primarily for checkingconcentration of magnetic particles in the vehicle.PRECIPITATION HARDENING: The process by which a metal is hardened by the formation of small particles ofsecondary composition from a solid solution. This process is usually performed at an elevated temperature considerablybelow the temperature of solution heat treating.PRECIPITATION HEAT TREATMENT: Artificial aging in which a constituent precipitates from a supersaturatedsolid solution.PRE-CLEANING: The cleaning of a part before testing so that it is free from all foreign material (paint, grease, oil,rust, scale, layout dye, wax crayon markings, etc.) which may cover a surface discontinuity and thereby inhibit theentrance of the penetrant liquid, or absorb the penetrant and render an “irrelevant indication.”PRESENTATION: The method used to show ultrasonic wave information. May include A, B, or C scans displayedeither on various types of recorders or cathode ray instrumentation’s.PRESERVATIVE, DEVELOPER (RT): A constituent (e.g., sodium sulfate) that minimizes the exhaustion of adeveloper caused by aerial oxidation, and serves to remove oxidation products which might retard development orproduce stain.PRESSURE MARK (RT): An effect produced by pressure on a film which after developing results in areas of eitherincreased or decreased density. The crescent-shaped pressure mark due to severe local bending of a film is often calleda crimp mark.PRIMARY MAGNETIC FIELD (ET): In eddy current inspection, the field produced by the test coil or coils asdifferentiated from the magnetic field produced by the eddy current or the resultant field.PRIMARY RADIATION (RT): Radiation coming directly from the source of radiation that has undergone no physicalprocess changing its character.PROBE (ET, MT, UT): An assembly containing a small coil or coils designed for eddy current inspection of smallareas immediately adjacent to the coil and an electromagnet producing magnetic fields for magnetic inspection. Theunit has two jointed laminated pole pieces permitting adjustment to varying surfaces configuration. Also the devicecontains a microphone used with an ultrasonic leak detector to receive ultrasonic energy resulting from leakage. SeeSEARCH UNIT.PROBE WOBBLE (ET): The change in angular orientation between a surface probe and the inspection surface. Probewobble results in lift-off variations.PROCESS ANNEALING: In the sheet and wire industries, heating a ferrous alloy to a temperature close to, but below,the lower limit of the transformation range and then cooling, in order to soften the alloy for further cold working.PROCESS ATTAINMENT (ABILITY): The ultimate ability of a process to find a defect of minute size at the currentstate-of-the-art, usually defined as the ability to detect defects as small ... See SENSITIVITY.PROCESS CAPABILITY: The ability of a process to repeatedly find a defect under the influence of normal day-to-dayvariations of process, people, materials, environment and other influences normally tied to a confidence level.
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