Los Bloques de Calibración o de referencia para pruebas ultrasónicas vienen en muchas formas y tamaños. El tipo de bloque de calibración depende de la aplicación NDT y la forma y figura del objetivo analizado. El material del Bloque de Referencia deber ser igual al material siendo inspeccionado y el defecto artificialmente inducido debe parecerse estrechamente al del defecto real.
Calibration Blocks, or standards, for ultrasonic testing come in many shapes and sizes. The type of calibration block depends upon the NDE application and the form and shape of the subject being tested. The material of the Reference Block should be the same as the material being inspected and the artificially induced flaw should closely resemble that of the actual flaw that the operator is testing for.
Calibration Blocks Overview
Standard Calibration Blocks that are available include:
Calibration Block 1 (EN12223) A steel block for the calibration of ultrasonic flaw detection and inspection equipment used in material testing. Used for the calibration of shear and longitudinal transducers, determination of shear wave emission point, refracted angle. Also for measurement of sensitivity and resolution.
Calibration Block 2 (EN27963) For the ultrasonic examination of welds. To check angle transducers for beam angle and index point. Available in 12.5mm and 20mm thickness.
Sonatest Universal CBU Calibration Block For calibration of small shear wave and longitudinal transducers, determination of shear wave emission point, refracted angle and measurement of sensitivity and depth resolution. 50 mm radius.
Steel Step Wedge 1mm to 8mm in 1mm steps. Each step is 20mm x 20mm. Used for checking the sensitivity of twin transducers on thin sections when using a flaw detector.
Steel Pipe Wedge Made from 50mm diameter pipe with thickness steps of 10, 8, 6, 4 and 2mm. This pipe wedge simulates steam boiler tubes in power stations and is used to calibrate flaw detectors for thin tube inspection.
Calibration Step Wedge Metric Series of steel discs set into a perspex block for calibration and linearity checking of thickness meters and flaw detectors. Wedge thicknesses 1.5, 2.5, 5.0, 10.0, 15.0, 20.0 mm.
Calibration Step Wedge Imperial Series of steel discs set into a perspex block for calibration and linearity checking of thickness meters and flaw detectors. Wedge thicknesses 0.05, 0.1, 0.2, 0.3, 0.4, 0.6 in.
Velocity Block Equivalent to a 1μs thickness of a known velocity in steel. The block is mounted on perspex. Used to check the velocity of other materials with thickness meters.
• Further Calibration Blocks available include:
• IOW A5 beam calibration blocks
• A6 & A7 resolution blocks complying to BS2704
• FB frequency block
• VW step wedge 1-8mm
• CBU universal calibration blocks (50mm radius)
• CBM thickness & CBV velocity blocks
• PW pipe step wedges 2-10mm
• RTB radiused calibration block for boiler tube probes
• Aluminium V1 & V2 calibration blocks
• ASME test blocks
• EMAT calibration pipe step wedge