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The PHASED ARRAY ULTRASOUND inspection technique is based on generating ultrasound data by constructive wave interference, generated by multiple elements (probes with multiple crystals) whose emission pulses are controlled by time delays, i.e. they are time delayed.

Beam sweeps through an angular range (S-scan), fixed angle scans (E-scan), compound scans (Compound scan), beam focusing, and a variety of inspections can be performed depending on the matrix and programming.

The main advantages over conventional ultrasound are the following:

• Provides a permanent inspection record.
• It is more versatile due to the ability to angle and focus the beam, which improves the signal-to-noise ratio.
• Faster log acquisition than conventional UTs.
• The human factor in these inspections has less influence, since mechanical movements are usually automated or semi-automated and therefore less subject to error. In addition, discontinuities are recorded in one or more representations (A;B;C;S-scan,…) that can be evaluated a posteriori and are less subject to the subjectivity of on-site interpretation.
• The amount of data for the evaluation, when using multiple angles, will be greater and, therefore, the probability of perpendicular incidence and detection of the discontinuity, which increases the precision in the sizing of discontinuities due to the availability of more angles and greater focusing capacity of the ultrasonic beam.
• Minimizes the need to work with radioactive sources to obtain permanent records, thus minimizing the risk to workers’ health, as well as allowing other work in close proximity, as opposed to the exclusion zones for members of the public required when working with these sources.

BUQUELAND specializes in this type of inspection in:

• Tubular welded joints
• T-graft welds
• Graft welds with X, K and Y configurations
• Wind tower shafts
• Circular and longitudinal welding of ferrules of large diameter structures
• Manufacture of blocks and their assembly in the naval sector.