Assessment of the Influence of Welding Parameters on Distortion

2014 ◽  
Vol 597 ◽  
pp. 208-212
Author(s):  
Fábio Renck Locatelli ◽  
Walter Jesus Paucar Casas ◽  
Ricardo Frederico Leuck Filho
Keyword(s):  
Welding Speed ◽  
Three Dimensional ◽  
Welding Process ◽  
Physical And Mechanical Properties ◽  
Element Model ◽  
Welding Parameters ◽  
Welding Sequence ◽  
Dimensional Finite Element ◽  
Definition Of ◽  
Three Dimensional Finite Element

The welding involves the transfer of high localized heat flow, which results in residual stresses in the welded body. The impossibility of relieving these stresses generates welding distortions that become a problem in dimensional setting of welded structures. This study aims to evaluate the influence of some parameters in the welding process in a T-type joint. Due to the complexity of the welded joint and the deposition rate, a three-dimensional finite element model was developed for the solution of the temperature field and distortions. The transient thermal analysis used the Goldak equation for definition of the heat flux transferred to the part. The nonlinear characteristics of the phenomenon as well as the dependence of physical and mechanical properties with the temperature were considered in this work. The parameters studied were the welding speed, welding sequence and cooling time between weld beads. The results suggest that the higher welding speed, the welding sequence forward and back and with cooling interval between beads present themselves as the best parameters for welding with lower distortions.

Numerical Simulation Analysis of Deformation in TIG Welding of I-Steel

2011 ◽  
Vol 189-193 ◽  
pp. 2196-2199
Author(s):  
Ling Li Meng ◽  
Yan Qun Huang ◽  
Ming Liu
Keyword(s):  
Finite Element ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Element Model ◽  
Welding Parameters ◽  
Gas Tungsten Arc ◽  
Dimensional Finite Element ◽  
Welding Sequences ◽  
Set Up ◽  
Three Dimensional Finite Element

Since it is inconsistent and uncontrollable in the experiment, any variance in specimen dimensions, welding parameters and testing conditions will influence the consistency of testing results to some extent. In this paper, the Finite Element Method(FEM) is employed to solve this problem. A three-dimensional finite element model is established to simulate the deformation of I-steel during gas tungsten arc welding (TIG) with FEM software, which is set up to analysis the deformation of I-steel with different welding sequences.

Impact of Welding Sequence on the CRDM Nozzle-to-Vessel Weld Stress Analysis

2004 ◽  
Author(s):  
Yaoshan Chen ◽  
David Rudland ◽  
Gery Wilkowski
Keyword(s):  
Computing Time ◽  
Three Dimensional ◽  
Welding Process ◽  
Element Model ◽  
Three Dimensional Model ◽  
Control Rod ◽  
Moving Source ◽  
Welding Sequence ◽  
Significant Difference ◽  
Three Dimensional Finite Element

A three-dimensional finite element model is presented to simulate the welding process of the side-hill control-rod-drive-mechanism (CRDM) nozzle to the vessel head. Emphasis is given to how the weld is laid out in the analysis so that accurate residual stress results can be obtained while the required computing time is viable. In the order of complexity, three approaches are examined in this study: a) the simultaneous approach, i.e., the weld bead (therefore the heat associated with it) is put in the model in a uniform fashion; b) the piece-by-piece approach, i.e., the weld is laid out segment by segment; c) the moving-source approach where the analysis is done by simulating the moving heat source. It is found that there is a significant difference between the stress results by the uniform approach and the piece-by-piece approach. While the moving source method gives the closet representation of the welding process, the computing time for such a multi-pass, three-dimensional model is still prohibitive. The natural choice is therefore the piece-by-piece approach, with the number of segments for the weld dependent on the weld parameters and the geometries of the nozzle and vessel head.

Numerical investigation on the effect of welding speed and heat input on the residual stress of multi-pass TIG welded stainless steel pipe

2020 ◽  
pp. 095440542098133
Author(s):  
Parviz Asadi ◽  
Samaneh Alimohammadi ◽  
Omid Kohantorabi ◽  
Ali Soleymani ◽  
Ali Fazli
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Numerical Investigation ◽  
Welding Speed ◽  
Heat Input ◽  
Three Dimensional ◽  
Welding Process ◽  
Element Model ◽  
Stress States ◽  
Three Dimensional Finite Element

A numerical investigation is provided to study the residual stress states in multi-pass TIG welding of stainless steel SUS304 pipe. An uncoupled thermomechanical three-dimensional finite element model is developed using the ABAQUS software for a circular weld design around the pipe. The effects of weld pass numbers, electrode moving speed, and heat input on the internal and external surface tensions of the pipe are investigated. The simulation results show that by increasing the welding speed, the axial tensile stresses decrease on the pipe surfaces. In the case of hoop stress, as the welding speed raises, the tensile and compressive stresses are increased for both two- and three-pass welding. However, the width of the stress zone becomes narrower in higher welding speeds. The hoop stresses, in comparison with the axial stresses, are more strongly influenced by the welding speed and the heat input. Furthermore, using the three-pass welding process results in much lower stresses in comparison with the two-pass one.

scholarly journals FATIGUE LIFE ESTIMATION OF A BUTT WELDED JOINT BY S-N APPROACH

2012 ◽  
pp. 95-99
Author(s):  
VINOD M. BANSODE ◽  
N.D. MISAL
Keyword(s):  
Fatigue Life ◽  
Fatigue Testing ◽  
Three Dimensional ◽  
Welding Process ◽  
Life Time ◽  
Element Model ◽  
Simulation Software ◽  
Surface Machining ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

A failure analysis based on stress life approach may be useful for predicting the life time of weld in the structure. This study presents an upcoming methodology in new three dimensional Finite Element Model to calculate the fatigue life of weld. Ansys 12.1 simulation software uses stress-life method, based on a static non-linear Structural analysis. The weld material S-N curve were experimentally determined by the Fatigue testing of the dumbell specimen as per 7608 standard. This study assumes that a flaw exist in weld due to welding process, material in-homogeneity, air voids, slugs or impurities in weld, improper surface machining and many more. This material curve is used in simulation to get more accurate results. Thus the fatigue life prediction with the material curves from experimentation will give us more accurate and close to actual failure results.

Influence of vertical misfit in screw fatigue behavior in dental implants: A three-dimensional finite element approach

2018 ◽  
Vol 232 (11) ◽  
pp. 1117-1128 ◽  
Author(s):  
Mikel Abasolo ◽  
Josu Aguirrebeitia ◽  
Javier Vallejo ◽  
Joseba Albizuri ◽  
Ibai Coria
Keyword(s):  
Finite Element ◽  
Dental Implant ◽  
Fatigue Failure ◽  
Fatigue Behavior ◽  
Three Dimensional ◽  
Element Model ◽  
Machining Process ◽  
Dimensional Finite Element ◽  
Definition Of ◽  
Three Dimensional Finite Element

Misfit is unavoidable in dental implant-supported prostheses due to machining process or inappropriate assembling, and the definition of an admissible misfit is still a controversial issue. This work aims to understand the behavior of the screws in dental implant-supported prostheses to estimate an admissible vertical misfit value in terms of screw fatigue failure. For that purpose, a finite element model of a dental implant-supported prosthesis was created and analyzed. Vertical misfits were introduced in different positions, the lower and upper screws were tightened to the bolting force values recommended by the manufacturer, and two different occlusal loads were analyzed. In addition, two different prosthesis materials were studied. Screw load variations were reported and a fatigue analysis was performed. As a result, it was observed that the screw tightening sequence closed small vertical misfits (equal to or less than 40 µm), whereas larger misfits (more than 40 µm) remained open. If the vertical misfit is closed by the end of the tightening sequence, it may be considered equivalent to the ideal fit situation in regard to screw fatigue failure. The prosthesis material had no significant influence on the fatigue behavior.

Numerical Simulation and Experiment Analysis of MIG Welding for Aluminum Alloy Extrusion

2012 ◽  
Vol 430-432 ◽  
pp. 1311-1314
Author(s):  
Zheng Zhi Luo ◽  
Yi Su Pan
Keyword(s):  
Numerical Simulation ◽  
Aluminum Alloy ◽  
Three Dimensional ◽  
Welding Process ◽  
Element Model ◽  
Mig Welding ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Welding Processes ◽  
Aluminum Alloy Extrusion

Welding characteristics of MIG welding for aluminum alloy extrusions are studied. In this article, the aluminum alloy is EN AW-6005A. The welding heat source and the welding processing of aluminum alloy extrusions are discussed. A three dimensional finite element model has been developed to dynamically simulate the welding process. The investigations focus on the comparison the welding heat resource of simulation and section of the experiments parts. And the residual stress of numerical simulation and tests are compared. It’s help to optimize the MIG welding processes and improve the welding quality for aluminum alloy extrusion.

Numerical Simulation of Welding for Vice-Frame Components

2010 ◽  
Vol 160-162 ◽  
pp. 220-225 ◽  
Author(s):  
Zheng Zhi Luo ◽  
Yi Su Pan
Keyword(s):  
Three Dimensional ◽  
Welding Process ◽  
Side Wall ◽  
Element Model ◽  
Simulation Method ◽  
Front Wall ◽  
Complex Structures ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Good Agreement

In this article the application possibilities of welding simulation for vice-frame components are discussed. A three dimensional finite element model has been developed to dynamically simulate the welding process. The investigations focus on the simulation of the model construction and the welding effect on distortions and its stress. Comparisons of experimental and numerical results show good agreement and that the simulation method is reasonable. The vice-frame is a casting component that comes from a goods wagon bogie. So the procedure of the vice-frame simulation can be used for more complex structures like the side-wall, front-wall, roof, floor plate, and so on. It can help that optimize the welding process and improve the welding quality.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

scholarly journals Internal Force on and Deformation of Steel Assembled Supporting Structure of Foundation Pit under Thermal Stress

2021 ◽  
Vol 11 (5) ◽  
pp. 2225
Author(s):  
Fu Wang ◽  
Guijun Shi ◽  
Wenbo Zhai ◽  
Bin Li ◽  
Chao Zhang ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Bending Moment ◽  
High Strength ◽  
Element Model ◽  
Internal Force ◽  
Foundation Pit ◽  
Dimensional Finite Element ◽  
Influence Of Temperature On ◽  
Scale Experiment ◽  
Three Dimensional Finite Element

The steel assembled support structure of a foundation pit can be assembled easily with high strength and recycling value. Steel’s performance is significantly affected by the surrounding temperature due to its temperature sensitivity. Here, a full-scale experiment was conducted to study the influence of temperature on the internal force and deformation of supporting structures, and a three-dimensional finite element model was established for comparative analysis. The test results showed that under the temperature effect, the deformation of the central retaining pile was composed of rigid rotation and flexural deformation, while the adjacent pile of central retaining pile only experienced flexural deformation. The stress on the retaining pile crown changed little, while more stress accumulated at the bottom. Compared with the crown beam and waist beam 2, the stress on waist beam 1 was significantly affected by the temperature and increased by about 0.70 MPa/°C. Meanwhile, the stress of the rigid panel was greatly affected by the temperature, increasing 78% and 82% when the temperature increased by 15 °C on rigid panel 1 and rigid panel 2, respectively. The comparative simulation results indicated that the bending moment and shear strength of pile 1 were markedly affected by the temperature, but pile 2 and pile 3 were basically stable. Lastly, as the temperature varied, waist beam 2 had the largest change in the deflection, followed by waist beam 1; the crown beam experienced the smallest change in the deflection.

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