Ultrasonic inspection of rough surface aluminium die castings

Palanisamy, Suresh; Nagarajah, Romesh; Iovenitti, Pio G.

doi:10.1784/insi.2007.49.3.160

Cited by 14 publications

(4 citation statements)

References 6 publications

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“…The compactness of the alloy was determined in 2 end rings and bars by X-ray analysis. In some cases, the X-ray analysis revealed high porosities [12] determined more by the micro-shrinkages in the end rings (see Fig. 5c).…”

Section: Determining the Compactness Of The Alloy In End Rings And Ba...mentioning

confidence: 97%

Analysis of the quality of squirrel cages rotor machined at Electroprecizia Electrical Motors

Milosan¹,

Oancea²,

Mija³

et al. 2022

RECENT

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The paper presents methods for improving the quality of rotor squirrel cages in the casting phase at Electroprecizia Electrical Motors Săcele. For this purpose, there are analysed the results of theoretical and experimental research on the existing interdependencies between the quality of rotor squirrel cages obtained by casting and the metallurgical quality of aluminium melts, respectively the parameters of the casting process. When balancing rotor squirrel cages, the non-homogeneity of the compactness of the cast aluminium mass raises a number of technological problems. This non-homogeneity of the compactness is determined by the presence of voids (bubbles, pores) in the cast material. However, the compactness of the aluminium mass (the voids in the cast aluminium) has a decisive influence on the electrical efficiency of the electric motor due to the drastic local modification of the electrical resistivity. Based on an analysis of the results obtained, there can be concluded that the development of a new family of electric motors, of super premium energy efficiency class (IE4), also involves the analysis and detection of the causes that lead to the formation of bubbles and pores in the cast aluminium mass, on the current process flow, subsequently reducing them by improving the existing technologies or even by replacing them.

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Section: Determining the Compactness Of The Alloy In End Rings And Ba...mentioning

confidence: 97%

Analysis of the quality of squirrel cages rotor machined at Electroprecizia Electrical Motors

Milosan¹,

Oancea²,

Mija³

et al. 2022

RECENT

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show abstract

“…In general, the results presented in the literature [40,41] show that proper selection of the transducer frequencies should be taken into consideration when inspecting rough surfaces. Using PAUT on WAAM-manufactured parts involves two issues, the first concerning the unknown response to the internal structure of the components and the second, the morphological variation of the surface, which influences the interaction between the emitted ultrasonic beam and the component [40].…”

Section: Phased-array Ultrasonic Testingmentioning

confidence: 99%

Non-Destructive Testing Inspection for Metal Components Produced Using Wire and Arc Additive Manufacturing

Serrati

Machado

Oliveira

et al. 2023

Metals

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The wire and arc additive manufacturing (WAAM) process enables the creation and repair of complex structures based on the successive deposition of fed metal in the form of a wire that is fused with an electric arc and then solidifies. The high number of depositions required to create or repair parts increases the likelihood of defect formation. If these are reliably detected during manufacturing, timely correction is possible. However, high temperatures and surface irregularity make inspection difficult. Furthermore, depending on the size, morphology, and location of the defect, the part can be rejected. Recent studies have shown that non-destructive testing (NDT) based on different physical phenomena for the timely, reliable, and customized detection of defects can significantly reduce the rejection rate and allow in-line repair, which consequently reduces waste and rework. This paper presents the latest developments in NDT for WAAM and its limitations and potential.

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“…The experiment was conducted with high spatial resolution and high signal to noise ratio. Subsequently, another ultrasound based NDT sensor was used to detect damages in aluminium die casting having rough surfaces (Palanisamy et al, 2007). The method was applied for die casting with holes drilled at the sides.…”

Section: Introductionmentioning

confidence: 99%

Detection of mode frequencies for spherical cavity embedded within a mild steel plate

Roy

Bose

2022

Journal of Vibration and Control

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The modern era of structures has observed a vast increase in non-destructive evaluation techniques in order to detect unwanted damages or porosities within the structure. Detection of defect frequencies will play a vital role in local defect resonance–based defect imaging in the future. In this paper, a technique for porosity and cavity detection in metals is discussed. A numerical investigation is carried out first on a square mild steel plate with a spherical cavity and a square mild steel block with multiple cavities. Different resonance frequencies and corresponding mode shapes in the case of the single cavity are calculated using steady state dynamic analysis. Six fundamental mode shapes are identified as Rocking (R), Torsional (T), Bouncing (B), 4-noded (4 N), 6-noded (6 N) and 8-noded (8 N) modes. Moreover, an explicit dynamic analysis is performed by exciting the model with a chirp signal for both cases of single and multiple cavities. The numerical study is supported by experimental results, performed on a mild steel plate embedded with a single spherical cavity and previously published literature. It is observed that the analytical, numerical as well as the experimental results obtained for all the modes are in close agreement with each other. The bouncing mode is found to be the promising one for pore imaging due to its uniform displacement across all the directions.

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Ultrasonic inspection of rough surface aluminium die castings

Cited by 14 publications

References 6 publications

Analysis of the quality of squirrel cages rotor machined at Electroprecizia Electrical Motors

Analysis of the quality of squirrel cages rotor machined at Electroprecizia Electrical Motors

Non-Destructive Testing Inspection for Metal Components Produced Using Wire and Arc Additive Manufacturing

Detection of mode frequencies for spherical cavity embedded within a mild steel plate

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