Study of features in weld root formation under double-sided synchronized arc welding of vertical joints of steel tanks

2021 ◽  
pp. 153-160
Author(s):  
O.I. Filippov ◽  
V.A. Erofeev ◽  
M.A. Sholokhov ◽  
S.I. Poloskov
Keyword(s):  
Deep Penetration ◽  
Computer Engineering ◽  
Cross Sectional ◽  
Steel Tanks ◽  
Face Dimension ◽  
Weld Root ◽  
Root Face ◽  
Welding Productivity ◽  
Vertical Up ◽  
Oil And Oil Products

It is shown that increase in the welding productivity of vertical joints of storage tanks for oil and oil products can be achieved due to the double-sided synchronized formation of the X-shaped groove. To minimize various disturbances, including variation of gap size and root face dimension, computer engineering analysis is performed, which showed that the formation of root pass during welding with the movement of the electrode down (vertical down) with increased dimension of the root face leads to lack of penetration, but during groove filling with the movement of the electrodes up (vertical up) deep penetration is achieved given the considerable root face dimension. It is defined that during welding of 30 mm thickness plates with root face dimension range from 6 to 8 mm, it is necessary to ensure the root gap dimension range from 1.5 to 3 mm along the entire length of the seam. In this case, the remaining unfilled cross-sectional area of the groove is small, which makes it possible to fill it in during single pass under two-arc double-sided welding. There is area of double-sided synchronized welding modes in which the occurrence probability of typical defects during the formation of the weld root is minimal.

scholarly journals COMPUTER ENGINEERING ANALYSIS OF DOUBLE-SIDED MULTI-ARC WELDING OF VERTICAL JOINTS OF TANKS FOR STORING OIL AND OIL PRODUCTS

2020 ◽  
pp. 60-66
Author(s):  
O. I. Filippov ◽  
M. A. Sholokhov ◽  
V. A. Erofeev ◽  
S. I. Poloskov
Keyword(s):  
Arc Welding ◽  
Weld Seam ◽  
Welding Process ◽  
Oil Products ◽  
Computer Engineering ◽  
Engineering Analysis ◽  
Melt Pool ◽  
Thick Shells ◽  
Vertical Up ◽  
Oil And Oil Products

The possibilities of computer engineering analysis of special features of double-sided multi-arc welding of vertical joints of tanks with thick shells for storing oil and oil products are shown. The analysis was carried out on the basis of a numerical implementation of the unconventional physical and mathematical model of the formation of a melt pool and a weld seam with two pairs of arcs on each side of the joint with a double-sided bevel. It was established that during weld formation with the movement of the electrode down (vertical down), the possibility of supplying the first pair of arcs with pulsed current should be taken into account, and for the second pairs, the possibility of lateral oscillation of the arcs in the groove with delays at the edges. During groove filling with the movement of the electrodes up (vertical up), their lateral oscillations and delays at the edges should be carried out according to an aperiodic law in order to minimize the effects of “magnetic blow”. For root formation, it is recommended to use pulsed welding, and during groove filling - high current welding with low welding speed. The results of the study can be used in the formation of scientifically-based requirements for the welding process and equipment for double-sided multi-arc welding of the vertical joints of tanks for storing oil and oil products.

scholarly journals Prevalence and associated factors of computer vision syndrome among the computer engineering students of Pokhara University affiliated colleges of Kathmandu valley

2020 ◽  
Vol 7 (6) ◽  
pp. 2027
Author(s):  
Kanchan Sitaula ◽  
Navaraj Kafle ◽  
Aashish Acharya ◽  
Ved Prakash Mishra
Keyword(s):  
Computer Vision ◽  
Associated Factors ◽  
Engineering Students ◽  
Kathmandu Valley ◽  
Eye Drops ◽  
Computer Engineering ◽  
Cross Sectional ◽  
Lighting Condition ◽  
Computer Vision Syndrome ◽  
Affiliated Colleges

Background: The increasing use of computers and electronic devices is rapidly increasing the related health issues of computer vision syndrome. Studies have identified longer use of computers, ergonomic practices as lighting condition of room, incorrect distance between eye and computer, refresh rate, use of spectacles were associated with computer vision syndrome (CVS) symptoms as back pain, tension, headache and others. The objective of this study was to find out the prevalence of CVS among computer engineering students of Pokhara University affiliated colleges of Kathmandu Valley and identify the associated factors and preventive measures being practiced by the students.Methods: A cross-sectional descriptive study was carried out using self-administered questionnaire among 234 undergraduate computer engineering students of Kathmandu Valley. Chi-square test was used to identify the association with computer vision syndrome and its determinants.Results: The prevalence of computer vision syndrome among the computer engineering students was found to be 76.50%. Only 39.3% were found to be using computer in upright with straight back posture and 73.5% were using computer at distance less than or equal to 50 cm. The 81.2% of participants were not following the 20/20/20 rule. During age, use of vision aid lens and use of protective eye glasses and artificial eye drops were found associated with CVS.Conclusions:The study revealed that the prevalence of computer vision syndrome was significantly high. Individuals using vision aid lens were found to be at risk of developing CVS and use of protective eye glass and artificial tears were found protective.  

scholarly journals Improving proposals for design standards of vertical cylindrical steel tanks for oil and oil products storage

2018 ◽  
Vol 2 (51) ◽  
pp. 5-18
Author(s):  
Volodymyr Onyshchenko ◽  
Mykola Zotsenko ◽  
Yuriy Vynnykov ◽  
Maksym Kharchenko ◽  
Іryna Lartseva
Keyword(s):  
Seismic Intensity ◽  
Design Standards ◽  
Vertical Reinforcement ◽  
Soil Cement ◽  
Steel Tanks ◽  
Tank Bottom ◽  
Cylindrical Steel Tanks ◽  
Cylindrical Steel ◽  
Economic Comparison ◽  
Oil And Oil Products

The calculation of subsidence points along the contour and in the center of the tank bottom is complicated in the case of erosion on inhomogeneous, subsidence, damaged soils, mules, flooded and seismically dangerous areas. The article analyzes the most dangerous geological phenomena, processes and complicated geotechnical conditions for the territory of Ukraine. The method of an artificial base arrangement with improved properties due to vertical reinforcement by soil cement elements is considered. Techno-economic comparison of the proposed variant with the usual pile variant of foundations (subsidence soils, estimated seismic intensity of 9 points) has been carried out. Probabilistic analysis of the artificial base has been carried out and the corellation between the probability of its failure from the percentage of reinforcement has been determined.

scholarly journals Recent Challenges in Electrical Engineering and the Solution with IT

2019 ◽  
Vol 8 (2S11) ◽  
pp. 2412-2418
Keyword(s):  
Action Plan ◽  
Electrical Engineering ◽  
Electrical Power ◽  
Cyber Attacks ◽  
Deep Penetration ◽  
Power Electronic ◽  
Computer Engineering ◽  
Electrical Power System ◽  
And Control ◽  
Power Electronic Technology

Electrical engineering is a broad field right from Electrical Power Generation to Distribution to end users. With deep penetration of Power Electronic Devices (PED) into electrical system, it has become complex to understand and control, but has given many advantages. Computer engineering is also an integrated branch of several fields of engineering like electrical and computers, which focuses on programming, and integration with hardware devices. Electrical engineering is always a challenging field which requires a regular up keeping with proper control and communication system. This paper aims to review the existing electrical power system, various challenges like increased demand, cyber attacks, power electronic technology trends, the opportunities emerged and the action plan to mitigate them with the use of Information Technology(IT) for a sustainable development

CARBON DIOXIDE EXTINGUISHING OF FIRE IN VERTICAL STEEL TANKS WITH OIL AND OIL PRODUCTS

2013 ◽  
Vol 22 (3) ◽  
pp. 58-61
Author(s):  
V. A. MERKULOV ◽  
◽  
K. P. KUZMENKO ◽  
A. I. KIRSANOV ◽  
◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Oil Products ◽  
Steel Tanks ◽  
Oil And Oil Products

Investigating the Challenges of Big Data Analytics from the Viewpoints of Students in Mashhad in 2019

2020 ◽  
Author(s):  
Elham Nazari ◽  
Marziyeh Afkanpour ◽  
Hamed Tabesh
Keyword(s):  
Big Data ◽  
Delphi Method ◽  
Data Analytics ◽  
Big Data Analytics ◽  
Cross Sectional Study ◽  
Computer Engineering ◽  
Cross Sectional ◽  
Major Barrier ◽  
Age Range ◽  
Very High

Introduction: Nowadays Big Data Analytics has attracted students for research due to its very high capabilities, but there are also obstacles to analyses that need to be addressed. Therefore, the purpose of this study is to investigate the viewpoints of students of different disciplines at Mashhad universities on the challenges of this analysis. Method: This study is a cross-sectional study conducted on students of different universities and fields such as computer engineering, pharmacy, industry and biology in Mashhad, Iran. A questionnaire based on literature review in Pubmed, Google scholar, and science direct databases was designed by 10 experts from different disciplines using Delphi method. 185 students participated in the study. Students' viewpoints on the challenges were also collected. Descriptive and analytical results were reported using SPSS 21 and Maxqda software. Results: The age range of most students was 25 - 34 years. 54.2% were female. Most of the participants in this study were students of engineering and medical informatics. Of the participants in this study, 96.4% considered big data analytics necessary, 50.6% were familiar with the benefits of analytics. Lack of awareness, inadequate management, lack of managers' knowledge, lack of expertise, and lack of priority were the most important challenges for students. Conclusion: Despite the importance and benefits of big data analytics, challenges are a major barrier to use that need to be addressed.

Automated Image Analysis Of Nuclear And Cytoplasmic Changes In Exfoliated Cells From Tracheas Treated With Carcinogen

1977 ◽  
Vol 35 ◽  
pp. 220-221
Author(s):  
S.F. Stinson ◽  
J.C. Lilga ◽  
M.B. Sporn
Keyword(s):  
Image Analysis ◽  
Pattern Analysis ◽  
Relative Proportion ◽  
Automated Image Analysis ◽  
Image Analyzer ◽  
Cross Sectional ◽  
Exfoliated Cells ◽  
Neoplastic Lesions ◽  
Analysis System ◽  
Morphologic Criterion

Increased nuclear size, resulting in an increase in the relative proportion of nuclear to cytoplasmic sizes, is an important morphologic criterion for the evaluation of neoplastic and pre-neoplastic cells. This paper describes investigations into the suitability of automated image analysis for quantitating changes in nuclear and cytoplasmic cross-sectional areas in exfoliated cells from tracheas treated with carcinogen.Neoplastic and pre-neoplastic lesions were induced in the tracheas of Syrian hamsters with the carcinogen N-methyl-N-nitrosourea. Cytology samples were collected intra-tracheally with a specially designed catheter (1) and stained by a modified Papanicolaou technique. Three cytology specimens were selected from animals with normal tracheas, 3 from animals with dysplastic changes, and 3 from animals with epidermoid carcinoma. One hundred randomly selected cells on each slide were analyzed with a Bausch and Lomb Pattern Analysis System automated image analyzer.

X-Ray Replication of Submicrometer Linewidth Patterns

1977 ◽  
Vol 35 ◽  
pp. 136-137
Author(s):  
Henry I. Smith ◽  
D.C. Flanders
Keyword(s):  
Electron Beam Lithography ◽  
Cross Sectional ◽  
X Ray ◽  
Electron Backscattering ◽  
Spatial Frequencies ◽  
Cross Sectional Profile ◽  
Carbon Foils ◽  
Sectional Profile ◽  
And Control ◽  
Soft Radiation

Scanning electron beam lithography has been used for a number of years to write submicrometer linewidth patterns in radiation sensitive films (resist films) on substrates. On semi-infinite substrates, electron backscattering severely limits the exposure latitude and control of cross-sectional profile for patterns having fundamental spatial frequencies below about 4000 Å(l),Recently, STEM'S have been used to write patterns with linewidths below 100 Å. To avoid the detrimental effects of electron backscattering however, the substrates had to be carbon foils about 100 Å thick (2,3). X-ray lithography using the very soft radiation in the range 10 - 50 Å avoids the problem of backscattering and thus permits one to replicate on semi-infinite substrates patterns with linewidths of the order of 1000 Å and less, and in addition provides means for controlling cross-sectional profiles. X-radiation in the range 4-10 Å on the other hand is appropriate for replicating patterns in the linewidth range above about 3000 Å, and thus is most appropriate for microelectronic applications (4 - 6).

A Field Emission System For Transmission Electron Microscopy

1973 ◽  
Vol 31 ◽  
pp. 298-299
Author(s):  
Michel Troyonal ◽  
Huei Pei Kuoal ◽  
Benjamin M. Siegelal
Keyword(s):  
Electron Microscope ◽  
Field Emission ◽  
Optical System ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Objective Lens ◽  
Electron Optical System ◽  
Cross Sectional ◽  
Transmission Electron ◽  
Emission System

A field emission system for our experimental ultra high vacuum electron microscope has been designed, constructed and tested. The electron optical system is based on the prototype whose performance has already been reported. A cross-sectional schematic illustrating the field emission source, preaccelerator lens and accelerator is given in Fig. 1. This field emission system is designed to be used with an electron microscope operated at 100-150kV in the conventional transmission mode. The electron optical system used to control the imaging of the field emission beam on the specimen consists of a weak condenser lens and the pre-field of a strong objective lens. The pre-accelerator lens is an einzel lens and is operated together with the accelerator in the constant angular magnification mode (CAM).

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