Computer Simulation of Thermal Processes in Arc Welding of Thick-Walled Aluminum Alloy Structures

2020 ◽  
pp. 12-20
Author(s):  
S.A. Korolev ◽  
A.E. Zimakov
Keyword(s):  
Computer Simulation ◽  
Finite Elements ◽  
Arc Welding ◽  
Geometric Model ◽  
Heat Removal ◽  
Thermal Processes ◽  
The Finite Element Method ◽  
Welding Zone ◽  
Welding Arc ◽  
Welded Structure

This paper presents the results of computer simulation of the thermal processes occurring during welding of thick-walled structures made of the AMg6 aluminium-magnesium alloy, widely used in modern industry. The model takes into account features associated with intensive heat removal from the welding zone caused by the large overall dimensions of the welded structure and the high thermal conductivity of the material used. In practice, these features increase the probability of formation of such defects as non-fusion of the weld with the base metal of the connected elements. Modeling was performed using the finite element method in the ANSYS software package. A geometric model was developed, and the bodies were divided into finite elements. For the areas with expected high temperature gradients, the finite elements in the geometric model were chosen to be much smaller than those in the areas further away from the welding zone. This increased the accuracy of the solution and significantly reduced the calculation time. The model of the heat source was constructed taking into account the gradual deposition of the weld metal as the welding arc moved along the connected edges. The simulation results confirmed the possibility of applying the available welding modes for the studied conditions.

scholarly journals The Development of Technology and Equipment for Ultrasonic Seam Welding of Synthetic Fabrics

2019 ◽  
pp. 25-34
Author(s):  
S.S. Volkov ◽  
D.S. Rozanov ◽  
L.A. Shestel
Keyword(s):  
Welding Process ◽  
Heat Removal ◽  
Maximum Temperature ◽  
Thermal Processes ◽  
Welding Zone ◽  
Seam Welding ◽  
Warm Up ◽  
Support Roller ◽  
Welded Seam ◽  
Welding Pressure

In this work, possible methods of ultrasonic welding of synthetic fabrics are considered and analyzed. Technological features of ultrasonic seam welding of synthetic fabrics are described. The key parameters of this type of welding that significantly influence the speed of achieving the maximum temperature in the fabric welding zone are identified. These parameters determine the intensity of the fabrics’ warm-up, and therefore, the efficiency of the welding process. Thermal processes occurring at seam welding of synthetic fabrics are studied. It is established that the welding time increases with an increase in the number of connecting layers as well as with addition of cotton to the fabric composition. It is determined that when welding synthetic fabrics of small thickness, heat removal to the waveguide and the support roller has virtually no influence on the maximum temperature at the border of the mating surfaces and on the time of achieving the maximum temperature. Experiments on welding lavsan, kapron and polypropylene fabrics are conducted. The dependence of the statistic welding pressure on the welding speed and the fixed gap between the waveguide and the support roller is investigated. It is determined that the movement of material under the waveguide doesn not have a warming-up impact on the neighbouring areas of the welded seam. The strength of the welded joints practically does not depend on the height and shape of the support roller.

Computer simulation of optical radiation scattering by aerosol media

2020 ◽  
Vol 86 (8) ◽  
pp. 43-48
Author(s):  
V. V. Semenov
Keyword(s):  
Finite Element Method ◽  
Computer Simulation ◽  
Finite Element ◽  
Optical Radiation ◽  
Light Transmission ◽  
Initial Conditions ◽  
Practical Significance ◽  
The Finite Element Method ◽  
Dispersed Medium ◽  
Element Method

Development of the technologies simulating optical processes in an arbitrary dispersed medium is one of the important directions in the field of optical instrumentation and can provide computer simulation of the processes instead of using expensive equipment in physical experiments. The goal of the study is simulation of scattering of optical radiation by aerosol media using the finite element method to show a practical significance of the results of virtual experiments. We used the following initial conditions of the model: radius of a spherical particle of distilled water is 1 μm, wavelength of the incident optical radiation is 0.6328 μm, air is a medium surrounding the particle. An algorithm for implementation of the model by the finite element method is proposed. A subprogram has been developed which automates a virtual experiment for a group of particles to form their random arrangement in the model and possibility of changing their geometric shape and size within predetermined intervals. Model dependences of the radiation intensity on the scattering angle for single particle and groups of particles are presented. Simulation of the light transmission through a dispersed medium provides development of a given photosensor design and determination of the minimum number of photodetectors when measuring the parameters of the medium under study via analysis of the indicatrix of scattering by a group of particles.

Distortion control in welded structure with Advanced Submerged Arc Welding

2020 ◽  
Vol 26 ◽  
pp. 1492-1495
Author(s):  
Abhishek Kumar Pandey ◽  
Abhijeet Dixit ◽  
Sunil Pandey ◽  
Pulak Mohan Pandey
Keyword(s):  
Arc Welding ◽  
Submerged Arc Welding ◽  
Distortion Control ◽  
Welded Structure ◽  
Submerged Arc

scholarly journals Facial pressure zones of an oronasal interface for noninvasive ventilation: a computer model analysis

2014 ◽  
Vol 40 (6) ◽  
pp. 652-657 ◽  
Author(s):  
Luana Souto Barros ◽  
Pedro Talaia ◽  
Marta Drummond ◽  
Renato Natal-Jorge
Keyword(s):  
Computer Simulation ◽  
Skin Lesion ◽  
Computer Model ◽  
Noninvasive Ventilation ◽  
Laser Scanning ◽  
Soft Tissues ◽  
Geometric Model ◽  
Human Face ◽  
Nasal Bridge ◽  
Nasal Cartilage

OBJECTIVE: To study the effects of an oronasal interface (OI) for noninvasive ventilation, using a three-dimensional (3D) computational model with the ability to simulate and evaluate the main pressure zones (PZs) of the OI on the human face. METHODS: We used a 3D digital model of the human face, based on a pre-established geometric model. The model simulated soft tissues, skull, and nasal cartilage. The geometric model was obtained by 3D laser scanning and post-processed for use in the model created, with the objective of separating the cushion from the frame. A computer simulation was performed to determine the pressure required in order to create the facial PZs. We obtained descriptive graphical images of the PZs and their intensity. RESULTS: For the graphical analyses of each face-OI model pair and their respective evaluations, we ran 21 simulations. The computer model identified several high-impact PZs in the nasal bridge and paranasal regions. The variation in soft tissue depth had a direct impact on the amount of pressure applied (438-724 cmH2O). CONCLUSIONS: The computer simulation results indicate that, in patients submitted to noninvasive ventilation with an OI, the probability of skin lesion is higher in the nasal bridge and paranasal regions. This methodology could increase the applicability of biomechanical research on noninvasive ventilation interfaces, providing the information needed in order to choose the interface that best minimizes the risk of skin lesion.

scholarly journals Non-linearity of the contact layer between elements joined in a multi-bolted connection and the preload of the bolts

2016 ◽  
Vol 165 (2) ◽  
pp. 3-8
Author(s):  
Rafał GRZEJDA
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Elements ◽  
Cylinder Head ◽  
Contact Layer ◽  
Rigid Support ◽  
The Finite Element Method ◽  
Bolted Connection ◽  
Winkler Model ◽  
Engine Cylinder

The paper presents modeling and calculations of multi-bolted connections at the assembly stage on an example of the engine cylinder head-block connection. The physical model of the connection was introduced as a combination of three subsystems: the set of bolts, the joined element and the contact layer between the joined element and the rigid support. The finite element method (FEM) was used for the modeling. Bolts were replaced with hybrid elements. The joined element was modeled with spatial finite elements. The Winkler model of the contact layer has been taken into consideration. The truth of the theorem has been examined, according to which non-linearity of the contact layer has a negligible impact on the final values of the bolt forces in the case of sequential preloading of the multi-bolted connection. The results of the calculations of a selected multi-bolted connection have been compared with the experimental results.

Computer Simulation in the Design of Local Exhaust Hoods for Shielded Metal Arc Welding

AIHAJ ◽  
1990 ◽  
Vol 51 (3) ◽  
pp. 115-126 ◽  
Author(s):  
KIMBERLY D. TUM SUDEN ◽  
MICHAEL R. FLYNN ◽  
RANDALL GOODMAN
Keyword(s):  
Computer Simulation ◽  
Arc Welding ◽  
Shielded Metal Arc Welding ◽  
Metal Arc Welding

A Method for Obtaining a Three-Dimensional Geometric Model of Dental Implants for Analysis via the Finite Element Method

2013 ◽  
Vol 22 (3) ◽  
pp. 309-314 ◽  
Author(s):  
Guilherme Carvalho Silva ◽  
Tulimar Machado Pereira Cornacchia ◽  
Estevam Barbosa de Las Casas ◽  
Cláudia Silami de Magalhães ◽  
Allyson Nogueira Moreira
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dental Implants ◽  
Geometric Model ◽  
Three Dimensional ◽  
The Finite Element Method ◽  
Element Method

scholarly journals Field-circuit modelling of an advanced welding transformer with two parallel rectifiers

2015 ◽  
Vol 64 (2) ◽  
pp. 249-257 ◽  
Author(s):  
Lyudmila Sakhno ◽  
Olga Sakhno ◽  
Simon Dubitsky
Keyword(s):  
Arc Welding ◽  
Power Efficiency ◽  
Power Conversion ◽  
Fea Model ◽  
Welding Arc ◽  
Transformation Ratio ◽  
Manual Arc Welding ◽  
Bridge Rectifier ◽  
Circuit Modelling ◽  
Secondary Winding

Abstract The new topology of three-winding welding transformer is proposed. Each secondary winding is connected in parallel through the separate bridge rectifier to the welding arc. The main feature of the proposed device is parallel working of two secondary windings with different rated voltage. The advantage is nonlinear transformation ratio of current that provides unprecedented power efficiency. The self- and mutual leakage inductances, which are important in power conversion, are calculated by 2D FEA model. The operational current of the device is modelled numerically via P-Spice simulator. The proposed topology is up to 30% more power effective than conventional welding transformer provided that the leakage inductances of primary and secondary windings are correctly fitted. This transformer is used for manual arc welding

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