Researching Signals from Workpiece Backside during Electron Beam Welding in Full Penetration Mode

2017 ◽  
Vol 743 ◽  
pp. 231-235
Author(s):  
Stepan Varushkin ◽  
Vladimir Belenkiy ◽  
Dmitriy Trushnikov
Keyword(s):  
Electron Beam ◽  
Electron Beam Welding ◽  
Research Work ◽  
Sensor Selection ◽  
Ion Current ◽  
Electron Current ◽  
X Ray ◽  
Control Precision ◽  
Full Penetration ◽  
Selection For

In this research work, we consider the problem of sensor selection for the system controlling full penetration mode in electron beam welding. For this, we have investigated four signals from the backside of the workpiece: electron current in root plasma, ion current in root plasma, through-thickness electron current and penetrating bremsstrahlung X-ray. After having done the research we have estimated the advisability of two signals: one for cases if requirements for control precision are high and the other for other cases.

scholarly journals Electron Beam Welding of Large Components for The Nuclear Industry

2019 ◽  
Vol 269 ◽  
pp. 02009
Author(s):  
Bernd Baufeld ◽  
Thomas Dutilleul
Keyword(s):  
Electron Beam ◽  
Pressure Vessel ◽  
Large Scale ◽  
Electron Beam Welding ◽  
Pressure Vessels ◽  
Nuclear Industry ◽  
Future Application ◽  
Research Centre ◽  
Circumferential Welds ◽  
Full Penetration

The nuclear industry requires rapid and high quality joining of large scale components. Electron beam welding (EBW) has the potential to respond to these requirements. The aim of Nuclear Advanced Manufacturing Research Centre (Nuclear AMRC) is to develop solutions for the future application of this technology. One example is the research on deep penetration EBW for joining large scale pressure vessels for small modular nuclear reactors. This will require several circumferential welds of ~ 6 metres length each. In addition joining of sections of the upper and lower vessel heads and of HIP sections with varying wall thickness must be developed. In collaboration with the US Electric Power Research Institute (EPRI) the Nuclear AMRC is working to produce two-thirds scaled demonstrators of the lower and the upper pressure vessel assembly (based on a generic NuScale model). 100 mm deep single track, full penetration welds of pressure vessel steel have been demonstrated. In addition, within 26 minutes joining of shells was achieved with 6 metres long circumferential welds (78 mm full penetration). In future the joining of complex sections and sections with variable thickness will be investigate.

X-ray sensor for guiding the electron beam on the joint in electron-beam welding

2006 ◽  
Vol 20 (11) ◽  
pp. 894-900 ◽  
Author(s):  
V D Laptenov ◽  
A V Murygin ◽  
D V Tikhonenko
Keyword(s):  
Electron Beam ◽  
Electron Beam Welding ◽  
X Ray

scholarly journals STUDY ON THE INFLUENCE OF ELECTRON BEAM ON THE PHYSICOCHEMICAL PROPERTIES OF POLYAMIDE 6

2021 ◽  
Vol 18 (2) ◽  
pp. 35-39
Author(s):  
B.K. Rakhadilov ◽  
Keyword(s):  
Crystal Structure ◽  
Electron Beam ◽  
Irradiation Dose ◽  
Research Work ◽  
Polyamide 6 ◽  
Electron Beam Treatment ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Pulse Accelerator ◽  
Scanning Electron

In this research work has been studied the effect of electron irradiation on the properties and structure of PA6 polyamide. The treatment was carried out with an industrial pulse accelerator in air with an irradiation dose in the range of 100-400 kGy. The processed polymer was also studied by Fourier-transform infrared spectroscopy, scanning electron microscopy, X-ray phase analysis and differential scanning calorimetry. According to the results of the study was known that electron beam treatment affects the crystal structure of polyamide-PA6, reducing its size. Also, it was found that the radiation dose of 200 kGy is optimal for preserving the crystal structure in comparison with 100, 300 and 400 kGy.

Aspects of microanalysis in a transmission electron microscope

1978 ◽  
Vol 36 (1) ◽  
pp. 510-511
Author(s):  
R. Sinclair ◽  
B.E. Jacobson
Keyword(s):  
Grain Size ◽  
Electron Beam ◽  
Electron Microscope ◽  
Chemical Analysis ◽  
Transmission Electron Microscope ◽  
Vapor Deposition ◽  
Critical Currents ◽  
X Ray ◽  
Fine Grain ◽  
Transmission Electron

INTRODUCTIONThe prospect of performing chemical analysis of thin specimens at any desired level of resolution is particularly appealing to the materials scientist. Commercial TEM-based systems are now available which virtually provide this capability. The purpose of this contribution is to illustrate its application to problems which would have been intractable until recently, pointing out some current limitations.X-RAY ANALYSISIn an attempt to fabricate superconducting materials with high critical currents and temperature, thin Nb3Sn films have been prepared by electron beam vapor deposition [1]. Fine-grain size material is desirable which may be achieved by codeposition with small amounts of Al2O3 . Figure 1 shows the STEM microstructure, with large (∽ 200 Å dia) voids present at the grain boundaries. Higher quality TEM micrographs (e.g. fig. 2) reveal the presence of small voids within the grains which are absent in pure Nb3Sn prepared under identical conditions. The X-ray spectrum from large (∽ lμ dia) or small (∽100 Ǻ dia) areas within the grains indicates only small amounts of A1 (fig.3).

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