Talon's extensive range of 24 state of the art ultrasonic systems allow inspection of all component types to the latest standards. Scan capabilities range from high speed multichannel plate inspection with back wall contour following to fully automated 3D complex contour following of composite components with simultaneous through transmission and pulse echo from two sides.
Ultrasonic Inspection Methods
Through Transmission Testing
Advantages of Ultrasonic Inspection
- Large surface areas or large volumes of parts/materials can be inspected rapidly and at low cost
- Parts with complex geometry are routinely inspected
- Indications are produced directly on surface of the part providing a visual image of the discontinuity
- Equipment investment is minimal
Immersion Testing is a technique where the part is immersed in a tank of water with the water being used as the coupling medium to allow the sound beam to travel between the transducer and the part.
The UT machine is mounted on a movable platform (a 'bridge') on the side of the tank so it can travel down the length of the tank. The transducer is swivel-mounted on at the bottom of a waterproof tube that can be raised, lowered and moved across the tank.
The bridge and tube movement permits the transducer to be moved on the X-, Y- and Z-axes. All directions of travel are gear driven so the transducer can be moved in accurate increments in all directions, and the swivel allows the transducer to be oriented so the sound beam enters the part at the required angle.
Round test parts are often mounted on a motorized turntable or powered rollers so that the part can be rotated as the transducer travels down its length, allowing the full circumference to be tested. Multiple transducers can be used at the same time so that multiple scans can be performed.
Through Transmission Inspections are performed using two transducers, one on each side of the part. The transmitting transducer sends sound through the part and the receiving transducer receives the sound. Reflectors in the part will cause a reduction in the amount of sound reaching the receiver so that the screen presentation will show a signal with lower amplitude (screen height).
When the sample being inspected has a flat surface, a simple raster-scan can be performed. If the sample is cylindrical, a turntable can be used to turn the sample while the transducer is held stationary or scanned in the axial direction of the cylinder. When the sample is irregular shaped, scanning becomes more difficult. For inspection applications involving parts having complex curvatures, scanning systems capable of performing contour following are usually necessary.
Contact transducers are used for direct Contact Inspections, and are generally hand manipulated. They have elements protected in a rugged casing to withstand sliding contact with a variety of materials. These transducers have an ergonomic design so that they are easy to grip and move along a surface. They often have replaceable wear plates to lengthen their useful life. Coupling materials of water, grease, oils, or commercial materials are used to remove the air gap between the transducer and the component being inspected.
Reliable bonds are essential to the integrity of aircraft composite structures throughout their service life. Therefore, NDT Bond Testing methods have been developed to assess bonding quality during maintenance.
Ultrasonic Testing System Specifications