ASTM E2700:20 pdf download

ASTM E2700:20 pdf download.Standard Practice for Contact Ultrasonic Testing of Welds Using Phased Arrays.
6.9 Reexamination of repaired/reworked items is not addressed in this standard and. if required. shall be specified in the contractual agreement.
7. Equipment
7.1.1 The ultrasonic phased array instrument shall be a pulse echo type with multiple independent pulser/receiver channels equipped with a standardized dB gain or attenuation control stepped in increiiienls of 1 dB minimum. The system shall be capable of generating and displaying both B-scan and S-scan images (ideally C-Scan image capability should also be available), which can be stored and recalled for subsequent review.
7.1.2 The phased array system shall have on-hoard local law generation software that permits direct modification to ultraSonic beam characteristics. Specific delay calculations may be performed by the system itself or Imported from external calculations.
7.1.3 Thc phased array system shall havc a means of data storage for archiving scan data. An external storage de’.ice, flash card, or USB memory stick can be used for data storage. A remote portable PC connected to the instrument may also be used ftr this purpose. If instruments do noL inherently store A-scan data, such as sonic manual instruments, the final image only may be recorded.
7.1.4 The phased array system shall be standarditcd for amplitude and height linearity in accordance with Guide F2491 annually. at a minimum.
7.1.5 The instrumeni shall be capable of pulsing and receiving at nominal frequencies of I MHi w U) MHz. For special applications, higher frequencies can be used, hut may require special instrumentation with appropriate digitization capability.
7.1.6 The instrument shall be capable of digitization of A-scans at a minimum of five Lin’s the nominal frequency of the probe used. Amplitude shall be digitized at a resolution of at least 8-hit (that is. 256 levels).
7.1.7 The instrument shall be capable of equalizing the amplitude response from a target at a fixed sound path for each angle used in the technique (angle corrected gain (ACG)). thereby providing compensation for wedge attenuation variation and echo-transmittance.
7.1 . The instrument shall also be equipped with facilities to equalize amplitudes of signals across the time-base (time- corrected gain (TCG)).
7.2 Plici.sc’d A rruv Prob’3:
7.2.1 The application requirements will dictate the design. including number of elements, element dimensions, and pitch, of the phased array probe used.
7.2.2 The probe selected shall not have more elements than the number of elements addressable by the pulser-receivers available in the phased array instrument being used
7.2.3 Phased array probes used for weld examination may be of I D. I .5D. or 2D design. For manual scanning techniques.