X-ray tomography study on porosity in electron beam welded dissimilar copper–304SS joints

Kar, Jyotirmaya; Dinda, Soumitra Kumar; Roy, Gour Gopal; Roy, Sunanda; Srirangam, Prakash

doi:10.1016/j.vacuum.2017.12.038

Cited by 49 publications

(18 citation statements)

References 31 publications

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“…This is a typical application in sectors that produce high value-added components (aeronautics, aerospace, automotive and bioengineering, among others) in which an innovative improvement in quality control or in the assembly line can lead to savings of millions of dollars. In this regard, some projects have been carried out to study the most common defects, such as pores, residual stresses or cracks [14][15][16][17].…”

Section: Computed Tomography In Metalsmentioning

confidence: 99%

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La tomografía computerizada más allá de la medicina: Aplicaciones al estudio microestructural del hormigón y otros materiales de la ingeniería (versión inglesa)

Alonso¹,

Algarra²,

Cabrera³

et al. 2020

hya

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La tomografía computerizada (TC) es una tecnología muy potente para el estudio de la microestructura de los materiales, lo que se refleja en la gran cantidad de trabajos publicados durante los últimos años. Más allá de su conocido uso en medicina, la TC se ha extendido a otros muchos campos científicos. En este trabajo se recogen algunos de ellos, con especial interés en el estudio del hormigón. Entre sus aplicaciones más relevantes destaca su uso en paleontología y patrimonio para analizar el interior de fósiles y restos arqueológicos sin dañarlos. Por otro lado, también se emplea con frecuencia en el estudio de materiales de la ingeniería, como los metales, los materiales compuestos, las mezclas bituminosas de los firmes, las rocas y el hormigón. En todos los casos, los datos obtenidos por los escáneres de TC se usan para mejorar el conocimiento de la respuesta macroscópica de dichos materiales frente a todo tipo de acciones, mecánicas o ambientales. En el caso particular el hormigón, entre sus aplicaciones principales se encuentran la del análisis de la matriz interna, el estudio de los patrones de fisuración y finalmente el estudio del hormigón reforzado con fibras.

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Section: Computed Tomography In Metalsmentioning

confidence: 99%

“…Finally, it is also worth noting the possibilities provided by CT for the study of welding joints [14,28]. Welding is the most widely used procedure for connecting two metal parts.…”

Section: Computed Tomography In Metalsmentioning

confidence: 99%

La tomografía computerizada más allá de la medicina: Aplicaciones al estudio microestructural del hormigón y otros materiales de la ingeniería (versión inglesa)

Alonso¹,

Algarra²,

Cabrera³

et al. 2020

hya

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show abstract

“…Nomoto et al studied the porosity formation in various laser-welded samples using XCT technique and found that the tensile properties were greatly deteriorated by porosity in the welds [22]. Using XCT technique, Kar et al recently concluded that the application of beam oscillation reduced the porosity content in EB-welded copper-304stainless steel joints [23]. Similar decrease in porosity content with the application of beam oscillation is seen by Dinda et al in the EB welded steel -Fe Al alloy [17].…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Effect of weld parameters on porosity formation in electron beam welded Zircaloy-4 joints: X-ray tomography study

Bandi

Dinda

Kar

et al. 2018

Vacuum

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Zircaloy-4 to Zircaloy-4 (Zr-4) similar butt joints were prepared using Electron Beam Welding (EBW) technique under different weld conditions such as with beam oscillation, without beam oscillation and at different welding speeds. Three-dimensional (3D) visualization of porosity in weld joints was carried out using X-ray computed tomography (XCT) technique. Quantification of porosity such as the average size, number and shape of the pores were evaluated and compared among weld joints produced under different conditions. XCT results show that the porosity of the welds increased substantially with the increase in the weld speed. More interestingly, the results also show that there is a significant decrease in porosity of the joint produced with beam oscillation condition. An increase in weld speed from 700 mm/min to 1000 mm/min resulted in a significant increase in pore density (from 16 to 313 per mm3) and it was observed that the average size of the macro pores increased from 96.4 µm to 121.5 µm. The joints prepared with beam oscillation produced least number of pores with minimum percentage of macro pores and maximum percentage of spherical pores in it. Raman spectroscopy results confirmed the presence of hydrogen gas in pores of all the weld joints.

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“…No branch of engineering is alien to this technology, and almost any material has been studied using this technique, from metals or plastics to composites or rocks [5][6][7][8][9][10]. A detailed review of the state of the art in this field can be found in [11,12].…”

Section: Introductionmentioning

confidence: 99%

Use of Computed Tomography Scan Technology to Explore the Porosity of Concrete: Scientific Possibilities and Technological Limitations

2021

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This paper shows the scientific possibilities of computed tomography for the study of concrete porosity. The enormous technological advances in computed tomography equipment used in materials research, with increasingly higher energy, better resolution and smaller pixel size will allow, in the near future, viewing pore sizes that are currently unthinkable, competing in resolution with the traditional techniques of mercury porosimetry and nitrogen adsorption. The challenge at that time (and to a lesser extent today) will be how to extract as much information as possible from the large amount of data provided by computed tomography equipment. In this article, through the study of six cubic specimens of 40 mm sides, different techniques of extraction and presentation of the information are shown, which help us to better understand the characterization of the morphology and distribution of the pores inside the concrete matrix. This information is essential to understand some of the macroscopic responses of the concrete.

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X-ray tomography study on porosity in electron beam welded dissimilar copper–304SS joints

Cited by 49 publications

References 31 publications

La tomografía computerizada más allá de la medicina: Aplicaciones al estudio microestructural del hormigón y otros materiales de la ingeniería (versión inglesa)

La tomografía computerizada más allá de la medicina: Aplicaciones al estudio microestructural del hormigón y otros materiales de la ingeniería (versión inglesa)

Effect of weld parameters on porosity formation in electron beam welded Zircaloy-4 joints: X-ray tomography study

Use of Computed Tomography Scan Technology to Explore the Porosity of Concrete: Scientific Possibilities and Technological Limitations

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