Visual Inspection | Ultrasonic Testing | Phased Array Ultrasonics |
A visual inspection or visual examination of objects, parts or components is the oldest and reliable non-destructive testing method.
This test method is applied to almost every product as a quality assurance tool.
The most detrimental unacceptable discontinuities in the objects or items are the surface opening discontinuities.
Visual scanning, inspection or testing can successfully detect these unacceptable surface discontinuities without applying expensive test methods.
Our team can provide welding and pressure vessel inspection for compliance and condition assessment requirements.
Vertest can perform visual examinations of welded joints or fabricated components, castings, forgings, rolled products and several other wrought products in accordance with AS 3978, ASME V Article 9, ASE IX QW 194, EN 970, ISO 10042, ASTM and other similar standards.
Ultrasonic Testing is a widely used form of non destructive testing. A transducer applies ultrasonic pulse waves in the material and the time is measured from the initiation time to the return of the reflection to the transducer. This time and the known velocity of the material allows the calculation of the distance. The sound reflection can come from a flaw, the opposing face of the material or any other change in the acoustic properties. Ultrasonic testing is preformed using frequencies ranging from 0.5Mhz to 10Mhz all above the level of sound that can be detected by the human ear hence the term ultrasonic.
This property of the ultrasound is used to identify the material wall thickness and any internal discontinuities in material.Ultrasonic testing is a very sensitive test method for internal discontinuities. Ultrasonic testing is safer, faster and more economical compared to radiographic examination.
The common applications of ultrasonic testing are wall thickness measurement (UTT), corrosion mapping, lamination testing (ULT) , flaw (discontinuities) detection in the material e.g. welds, castings, forgings and other wrought products (UFD). Vertest has preformed the following ultrasonic inspections:
Phased Array Ultrasonics
Phased Array ultrasonic testing (PAUT) is an advanced method of ultrasonic testing. Phased array ultrasonic method can reveal defects embedded in the material that cannot be easily resolved with conventional ultrasonic testing.
The phased array probe consists an array of number of small ultrasonic transducers each of which can be pulsed individually. Ultrasonic phased array systems can potentially be employed in almost any test where conventional ultrasonic flaw detectors have traditionally been used.
Weld inspection and crack detection are the most important applications, and these tests are done across a wide range of industries including aerospace, power generation, petrochemical, metal billet and tubular goods suppliers, pipeline construction and maintenance, structural metals, and general manufacturing.
Phased arrays can also be effectively used to profile remaining wall thickness in corrosion survey applications. The ultrasonic beam is swept like a search-light through the object being examined, and the data from multiple beams are put together to make a visual image showing a slice through the object. This gives phased array testing the ability to inspect critical applications faster then conventional ut bay scanning multipule angles in one scan.
The use of multiple probe elements produce a steerable, focused, high-resolution beam. Compared to conventional ultrasonic testing, Phased Array ultrasonic testing instruments and probes are complex and expensive and requires highly trained, skilled and experienced technicians.