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The imaging algorithm for the ultrasonic testing of metal castings by the application of automated testing systems based on a six degree of freedom robotic manipulators

Dolmatov Dmitry, Zhvyrblya Vadim, Sednev Dmitry, Kroening Michael

Computer Methods in Materials Science

2018

Vol. 18, No. 2

49--57

Complex-shaped surface represents one of the challenges in ultrasonic testing of metal castings. This conditions the growing interest in development and application of the automated testing system based on a six degrees of freedom (DOF) robotic manipulators. This is due to their ability to provide ultrasonic scanning of the curved specimens with high speed. Higher reliability of the results can be obtained via implementation of the imaging algorithms based on Synthetic Aperture Focusing Technique (SAFT) in the named systems. This approach allows to obtain high-resolution imagery of the internal structure of controlled objects with reduced level of grain noise, the latter occurs due to the often encountered coarse-grained structure of metal castings. In this paper, we introduce the novel imaging algorithm for the automated ultrasonic testing system based on a six degree of freedom robotic manipulator. The capabilities of the algorithm were verified by the application of computer simulations in CIVA 2016 software and also via the in situ experiments. In all the cases analyzed the results revealed that the imaging algorithm allows to make precise imagery of the internal structure of the specimens with different curvature. The obtained research results confirmed the suggested algorithm effectiveness, thus making it acceptable for prospective industrial applications.

Ultrasonic Sampling Phased Array Testing as a Replacement for X-ray Testing of Weld Joints in Ship Construction

Bulaviniov A., Pinchuk R., Pudovikov S., Boller C.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2012

Vol. 6, no. 2

231--234

According to European Standard EN 1712 ultrasonic testing of thin-walled welded joints is mandatory for wall thicknesses of more than 8 mm only. Any thinner components do have to undergo X-ray inspection. Besides various advantages of X-ray testing viz. high sensitivity to smallest inclusions, high acceptance in the ship building sector and “automatic” documentation of inspection results, there are also several deficiencies (like radiation protection issues, inspection time expenditure etc.) creating a reasonable request for more cost-effective alternatives. Sampling Phased Array technology introduced by Fraunhofer-IZFP provides significant improvement of flaw detectability also in thin-walled welded joints due to its tomographic approach in processing of signals ob-tained by ultrasonic phased array transducers. It allows high-quality imaging of welded joints and detection of relevant material flaws. Real-time ultrasonic imaging with tomographic quality offers a great alternative to X-ray testing with respect to inspection speed and modern documentation of inspection results. The basic principles of Sampling Phased Array are presented in the paper and several application results ob-tained on welded joints of marine objects are presented.