Effect of die misalignment on the joining quality of Al/steel self-piercing riveting structure

International Journal of Material Forming, Journal Year: 2024, Volume and Issue: 17(2)

Published: Jan. 15, 2024

Language: Английский

Challenges in non-destructive X-ray CT testing of riveted joints in the automotive industry

Deleted Journal, Journal Year: 2024, Volume and Issue: 6(7)

Published: June 19, 2024

Abstract Despite recent advancements, contemporary laboratory-based industrial computed tomography (CT) technology has not yet achieved the status of an efficient and economically viable in situ non-destructive method for examining riveted joints that are commonly used automotive industry. 2D X-ray or 3D CT systems can only reliably assess a rivet joint’s condition rare, favorable circumstances. Moreover, comprehensive analysis to identify obstacles preventing from efficiently capturing high-resolution, contrast-rich scans general is lacking. This work delves into challenges limitations prevent operators reaching desired precision required rigorous quality control. The study specifically addresses questions concerning reachability positioning sample structure, radiodensity beam hardening, relationship between spot size power, economic feasibility—all within context analyzing Additionally, we provide abstracted overview current tube market, which informs our discussion on these specific aspects. Through combination experimental findings, analytical insights, deductions, shed light persistent difficulties achieving resolutions comparable macro-sectioning microscopy, currently considered gold standard joints. Our investigation further explores potential photon-counting detector paired with conventional, source. Furthermore, investigate use synchrotron beamline as source conjunction custom-designed optimized such geometries. employs scintillators coupled optical magnification, functioning similarly microscope. findings data collection conclusively reveal commercially available still fail meet requirements testing, underscoring urgent need research development enable widespread implementation.

Language: Английский

The Study of Nitrogen and Phosphorus Removal Efficiency in Urbanized River Systems Using Artificial Wetland Systems with Different Substrates

Water, Journal Year: 2024, Volume and Issue: 16(22), P. 3309 - 3309

Published: Nov. 18, 2024

This study evaluated the effectiveness of five commercial substrates (zeolite, volcanic rock, gravel, magic rack, and ceramic pellets) in removing nitrogen (N) phosphorus (P) from urban river systems using constructed wetlands. By employing X-ray CT NGS technologies, we analyzed physical structure microbial communities they harbor. The results indicated that rock pellets, due to their high porosity specific surface area, performed exceptionally well removal. Specifically, with these two achieved ammonia removal rates 89.86% 88.45%, total 78.78% 74.97%, 92.67% 80.82%, respectively, within a 7-day period. Furthermore, on pellets were more diverse, which correlated pollutant efficiency. further elucidated synergistic role substrate characteristics community function removal, enhancing understanding purification mechanisms These findings provide scientific basis for ecological restoration rivers are significant improving quality water environments.

Language: Английский