Laser Transmission Welding of a Lap-Joint: Thermal Imaging Observations and three–dimensional Finite Element Modeling

2007 ◽  
Vol 129 (9) ◽  
pp. 1177-1186 ◽  
Author(s):  
L. S. Mayboudi ◽  
A. M. Birk ◽  
G. Zak ◽  
P. J. Bates
Keyword(s):  
Finite Element ◽  
Temperature Distribution ◽  
Laser Beam ◽  
Thermal Imaging ◽  
Thermal Model ◽  
Three Dimensional ◽  
Welding Process ◽  
Lap Joint ◽  
Laser Transmission Welding ◽  
Joint Geometry

Laser transmission welding (LTW) is a relatively new technology for joining plastic parts. This paper presents a three-dimensional (3D) transient thermal model of LTW solved with the finite element method. A lap-joint geometry was modeled for unreinforced polyamide (PA) 6 specimens. This thermal model addressed the heating and cooling stages in a laser welding process with a stationary laser beam. This paper compares the temperature distribution of a lap-joint geometry exposed to a stationary diode laser beam, obtained from 3D thermal modeling with thermal imaging observations. It is shown that the thermal model is capable of accurately predicting the temperature distribution when laser beam scattering during transmission through the polymer is included in the model. The weld dimensions obtained from the model have been compared with the experimental data and are in good agreement.

Thermal Imaging Studies and 3-D Thermal Finite Element Modeling of Laser Transmission Welding of a Lap-Joint

2006 ◽  
Author(s):  
L. S. Mayboudi ◽  
A. M. Birk ◽  
G. Zak ◽  
P. J. Bates
Keyword(s):  
Finite Element ◽  
Temperature Distribution ◽  
Laser Beam ◽  
Thermal Imaging ◽  
Thermal Model ◽  
Three Dimensional ◽  
Welding Process ◽  
Lap Joint ◽  
Laser Transmission Welding ◽  
Joint Geometry

Laser transmission welding (LTW) is a relatively new technology for joining plastic parts. This paper presents a three-dimensional (3-D) transient thermal model of LTW solved with the finite element method (FEM). A lap-joint geometry was modelled for unreinforced nylon 6 specimens. This thermal model addressed the heating and cooling stages in a laser welding process with a stationary laser beam. This paper compares the temperature distribution of a lap-joint geometry exposed to a stationary diode laser beam, obtained from 3-D thermal modelling with thermal imaging observations. It is shown that the thermal model is capable of accurately predicting the temperature distribution when laser beam scattering during transmission through the polymer is included in the model. The weld dimensions obtained from the model have been compared with the experimental data and are in good agreement.

Distortion Prediction of Welded Thin Plate Lap Joints by Finite Element Analysis and Experiment

2019 ◽  
Vol 796 ◽  
pp. 175-182
Author(s):  
Mohamad Nizam Ayof ◽  
Ruzaini Mohd Nawi ◽  
Nur Izan Syahriah Hussein ◽  
Nor Zulaikha Zainol
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Gas Metal Arc Welding ◽  
Three Dimensional ◽  
Welding Process ◽  
Element Model ◽  
Lap Joints ◽  
Lap Joint ◽  
Element Analysis ◽  
Metal Arc Welding

Welding process is an efficient joining process of metals that is achieved by gas metal arc welding (GMAW) process. Localized heating during welding process can result in distortion of the welded plate. The estimation of magnitude and distribution of distortion are important to maintain the quality of products. Finite element method is implemented to investigate the distortions behavior of thin steel plate, cold rolled (SPCC) material in lap joint using GMAW process. A three-dimensional, two-step thermomechanical finite element model study was applied to analyze and evaluate distortion behavior in lap joint. The result of distortion from finite element analysis (FEA) was compared to experimental data to validate the accuracy of the method.

Thermomechanical analysis applied to the laser beam welding simulation of aeronautical structures

2004 ◽  
Vol 120 ◽  
pp. 785-792
Author(s):  
C. Darcourt ◽  
J. M. Roelandt ◽  
M. Rachik ◽  
D. Deloison ◽  
B. Journet
Keyword(s):  
Finite Element ◽  
Laser Beam ◽  
Laser Beam Welding ◽  
Three Dimensional ◽  
Welding Process ◽  
Experimental Tests ◽  
Thermomechanical Analysis ◽  
Stiffened Panels ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

The present work is being done in the framework of a national program about the lightening of aeronautical structures and describes a three-dimensional finite element simulation of the laser beam welding process. The targeted aeronautical structures are stiffened panels in aluminum alloys, which tend to replace riveted assemblies. Semi-coupled thermomechanical finite element analyses have been carried out to evaluate the magnitude and distribution of welding-induced residual stresses in order to take them into account for fatigue sizing. The finite element code MSC.Marc is used for the different calculations. Specific welding features have been added to the code through the implementation of a moving heat source or an elastoviscoplastic law. Experimental tests have been carried out in order to provide mechanical and thermal databases to the model. Monitored experimental welding have been made for comparisons with the simulation. In particular, results of thermocouple measurements have permitted to improve the thermal model.

Analytical Modeling of Temperature Distribution in Interposer-Based Microelectronic Systems

2013 ◽  
Author(s):  
Leila Choobineh ◽  
Dereje Agonafer ◽  
Ankur Jain
Keyword(s):  
Heat Transfer ◽  
Finite Element ◽  
Temperature Field ◽  
Temperature Distribution ◽  
Analytical Modeling ◽  
Three Dimensional ◽  
Heat Transfer Process ◽  
Thermal Design ◽  
Research Attention ◽  
On Chip

Heterogeneous integration in microelectronic systems using interposer technology has attracted significant research attention in the past few years. Interposer technology is based on stacking of several heterogeneous chips on a common carrier substrate, also referred to as the interposer. Compared to other technologies such as System-on-Chip (SoC) or System-in-Package (SiP), interposer-based integration offers several technological advantages. However, the thermal management of an interposer-based system is not well understood. The presence of multiple heat sources in various die and the interposer itself needs to be accounted for in any effective thermal model. While a finite-element based simulation may provide a reasonable temperature prediction tool, an analytical solution is highly desirable for understanding the fundamentals of the heat transfer process in interposers. In this paper, we describe our recent work on analytical modeling of heat transfer in interposer-based microelectronic systems. The basic governing energy conservation equations are solved to derive analytical expressions for the temperature distribution in an interposer-based microelectronic system. These solutions are combined with an iterative approach to provide the three-dimensional temperature field in an interposer. Results are in excellent agreement with finite-element solutions. The analytical model is utilized to study the effect of various parameters on the temperature field in an interposer system. Results from this work may be helpful in the thermal design of microelectronic systems containing interposers.

scholarly journals Analysis of temperature-induced deformation and stress distribution of long-span concrete truss combination arch bridge based on bridge health monitoring data and finite element simulation

2020 ◽  
Vol 16 (10) ◽  
pp. 155014772094520
Author(s):  
Yanwei Niu ◽  
Yong’e Wang ◽  
Yingying Tang
Keyword(s):  
Finite Element ◽  
Temperature Distribution ◽  
Stress Distribution ◽  
Health Monitoring ◽  
Three Dimensional ◽  
Monitoring Data ◽  
Temperature Fields ◽  
Structural Deformation ◽  
Arch Bridge ◽  
Bridge Health Monitoring

Through decades of operation, deformation fluctuation becomes a central problem affecting the normal operating of concrete truss combination arch bridge. In order to clarify the mechanism of temperature-induced deformation and its impact on structural stress distribution, this article reports on the temperature distribution and its effect on the deformation of concrete truss combination arch bridge based on bridge health monitoring on a proto bridge with 138 m main span. The temperature distribution and deformation characteristics of the bridge structure in deep valley area are studied. Both of the daily and yearly temperature variation and structural deformation are studied based on bridge health monitoring. Using the outcome of monitoring data, three-dimensional solid finite element models are established to analyze the mechanism of temperature-induced deformation of the whole bridge under different temperature fields. The influence of temperature-induced effect is discussed on local damage based on the damage observation of the background bridge. The outcome of comparisons with field observation validates the analysis results. The relevant monitoring and simulation result can be referenced for the design and evaluation of similar bridges.

scholarly journals Steel Sheets Laser Lap Joint Welding—Process Analysis

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2258 ◽  
Author(s):  
Hubert Danielewski ◽  
Andrzej Skrzypczyk
Keyword(s):  
Numerical Simulation ◽  
Laser Beam ◽  
Steel Sheet ◽  
Process Analysis ◽  
Welding Process ◽  
Parameters Estimation ◽  
Welding Parameters ◽  
Lap Joint ◽  
Beam Radiation ◽  
Keyhole Effect

This article presents the results of steel-sheet lap-joint-welding using laser beam radiation. The use of a laser beam and keyhole effect for deep material penetration in lap joint welding was presented. Thermodynamic mechanism of laser welding is related to material properties and process parameters. Estimation of welding parameters and joint properties’ analysis was performed through numerical simulation. The article presents a possibility of modeling laser lap-joint welding by using Simufact Welding software based on Marc solver and thermo-mechanical solution. Numerical calculation was performed for surface and conical volumetric heat sources simulating laser absorption and keyhole effect during steel sheet welding. Thermo-mechanical results of fusion zone (FZ), heat-affected zone (HAZ) and phase transformations calculated in numerical simulation were analyzed. The welding parameters for partial sealed joint penetration dedicated for gas piping installations were estimated from the numerical analysis. Low-carbon constructional steel was used for numerical and experimental analyses. A trial joint based on the estimated parameters was prepared by using a CO2 laser. Numerical and experimental results in the form of hardness distributions and weld geometry were compared. Metallographic analysis of the obtained weld was presented, including crystallographic structures and inclusions in the cross section of the joint.

scholarly journals Three-Dimensional Temperature Distribution Produced by a Moving Laser Beam

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
R. Uyhan
Keyword(s):  
Temperature Field ◽  
Theoretical Model ◽  
Temperature Distribution ◽  
Laser Beam ◽  
Three Dimensional ◽  
Constant Speed ◽  
Unsteady Temperature ◽  
Unsteady Temperature Field ◽  
Absorbing Layer

An axisymmetric laser beam, moving with constant speed, heats a thin infrared absorbing layer sandwiched between two plastic sheets. We use a simplified theoretical model to study the three-dimensional unsteady temperature field produced by the moving laser beam.

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