Angular distortion analysis of the multipass welding process on combined joint types using thermo-elastic–plastic FEM with experimental validation

2013 ◽  
Vol 69 (9-12) ◽  
pp. 2373-2386 ◽  
Author(s):  
Robert Ngendang Lidam ◽  
Yupiter H. P. Manurung ◽  
Esa Haruman ◽  
M. Ridhwan Redza ◽  
M. Ridzwan Rahim ◽  
...  
Keyword(s):  
Experimental Validation ◽  
Welding Process ◽  
Angular Distortion ◽  
Multipass Welding ◽  
Elastic Plastic ◽  
Distortion Analysis

Experimental Verification of Distortion Analysis of Welded Stiffeners

2002 ◽  
Vol 18 (04) ◽  
pp. 216-225
Author(s):  
M. V. Deo ◽  
P. Michaleris
Keyword(s):  
Experimental Verification ◽  
Experimental Validation ◽  
Welding Process ◽  
Computational Results ◽  
Buckling Mode ◽  
Fea Model ◽  
Buckling Stress ◽  
Distortion Analysis ◽  
Process Simulations ◽  
Buckling Distortion

This paper presents an experimental verification for the predictive distortion analysis approach proposed in Michaleris & DeBicarri (1996,1997) and Vanli & Michaleris (2001) for welded T-type stiffeners. The predictive technique employing the decoupled 2-D and 3-D approach is used for the prediction of buckling distortion and the magnitude of bowing distortion. Two-dimensional thermo-mechanical welding process simulations are performed to determine the residual stress. The critical buckling stress along with the buckling mode are computed in 3-D eigenvalue analyses. Large deformation analyses are carried out to predict the magnitude of bowing distortion. Experimental validation of the prediction is carried out in the lab. Welding experiments are carried out using welding conditions identical to those used in the FEA model. The computational results are then verified with experimental observations

Angular Distortion Analysis on Multipassed Welding of Combined Joint Types Using Thermo-Elastic-Plastic FEM

2011 ◽  
Vol 314-316 ◽  
pp. 315-318 ◽  
Author(s):  
Robert Ngendang A. Lidam ◽  
Yupiter H.P. Manurung ◽  
M. Ridhwan ◽  
M.A.R. Ridzwan ◽  
M. Shahar S. ◽  
...  
Keyword(s):  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Management Tool ◽  
Angular Distortion ◽  
Base Line ◽  
Elastic Plastic ◽  
Metal Arc Welding ◽  
Distortion Analysis ◽  
Computation Management ◽  
2D And 3D

A 2D and 3D thermo-elastic-plastic (TEP) FE Analysis has been developed to simulate the angular distortion induced by Gas Metal Arc Welding (GMAW) process on combination of butt and T-joint with thickness of 9 mm. The material used in this study was low alloy Manganese Carbon steel S355J2G3. In this research, SYSWELD 2010 with its computation management tool known as Multipassed Welding Advisor (MPA) was used to analyze the distortion behaviour of combined joint types. To model the heat source of GMAW, Goldak’s double ellipsoid representation which is available within this FEA code was selected. The final objective of this research is hence aimed to be base line study to provide preliminary information in preparing the tools or equipments for experimental investigation.

Distortion Analysis of Welded Stiffeners

2001 ◽  
Vol 17 (04) ◽  
pp. 226-240 ◽  
Author(s):  
O. A. Vanli ◽  
P. Michaleris
Keyword(s):  
Residual Stress ◽  
Heat Input ◽  
Welding Process ◽  
Angular Distortion ◽  
Welding Distortion ◽  
Two Dimensional ◽  
Buckling Mode ◽  
Buckling Stress ◽  
Distortion Analysis ◽  
Process Simulations

This paper presents a welding distortion analysis approach for T-stiffeners with a particular emphasis on welding-induced buckling instabilities. Two-dimensional thermomechanical welding process simulations are performed to determine the residual stress and angular distortion. This critical buckling stress along with the buckling mode and bowing distortion are computed in 3-D eigenvalue and linear stress analyses. The effects of the stiffener geometry, weld sequence, weld heat input and mechanical fixturing on the occurrence of buckling and the distortion pattern are investigated.

Numerical simulation and experimental validation of angular distortion and residual stresses in a T-joint

2015 ◽  
Vol 57 (7-8) ◽  
pp. 628-634
Author(s):  
Jing Chen ◽  
Liying Wang ◽  
Zhendong Shi ◽  
Zhen Dai ◽  
Meiqing Guo
Keyword(s):  
Numerical Simulation ◽  
Residual Stresses ◽  
Experimental Validation ◽  
Angular Distortion

scholarly journals Modified Equivalent Load Method for Welding Distortion Analysis

2020 ◽  
Vol 8 (10) ◽  
pp. 794
Author(s):  
Jaemin Lee ◽  
Hyun Chung
Keyword(s):  
Shell Element ◽  
Angular Distortion ◽  
Computational Time ◽  
Welding Distortion ◽  
Distortion Analysis ◽  
Equivalent Load Method ◽  
Inherent Deformation ◽  
Longitudinal Bending ◽  
Equivalent Load ◽  
Improved Accuracy

In this study, modified equivalent load method for welding distortion analysis is suggested to improve its accuracy. To avoid the excessive computational time for welding distortion analysis of large welded structures, shell element-based elastic analysis methods are widely used, applying the inherent deformation approach. Equivalent nodal forces are commonly used in common FE (Finite Element) codes to enter these inherent deformation values. However, the conventional method cannot estimate precise longitudinal bending following the conventional equation. In this study, the problem of the existing equivalent load method is analyzed by a case study, and the modified equivalent load method that can estimate angular distortion, transverse shrinkage, and longitudinal bending is presented based on the FEM principle. The results show that by applying the proposed method, the shell element-based elastic FE approach for the welding distortion analysis can be achieved with improved accuracy.

Evolution of Temperature Distribution and Microstructure in Multipass Welded AISI 321 Stainless Steel Plates With Different Thicknesses

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
Soheil Nakhodchi ◽  
Ali Shokuhfar ◽  
Saleh Akbari Iraj ◽  
Brian G. Thomas
Keyword(s):  
Stainless Steel ◽  
Temperature Distribution ◽  
Residual Stresses ◽  
Arc Welding ◽  
Welding Process ◽  
Steel Plates ◽  
Temperature History ◽  
Transient Temperature ◽  
Multipass Welding ◽  
Aisi 321

Prediction of temperature distribution, microstructure, and residual stresses generated during the welding process is crucial for the design and assessment of welded structures. In the multipass welding process of parts with different thicknesses, temperature distribution, microstructure, and residual stresses vary during each weld pass and from one part to another. This complicates the welding process and its analysis. In this paper, the evolution of temperature distribution and the microstructure generated during the multipass welding of AISI 321 stainless steel plates were studied numerically and experimentally. Experimental work involved designing and manufacturing benchmark specimens, performing the welding, measuring the transient temperature history, and finally observing and evaluating the microstructure. Benchmark specimens were made of corrosion-resistant AISI 321 stainless steel plates with different thicknesses of 6 mm and 10 mm. The welding process consisted of three welding passes of two shielded metal arc welding (SMAW) process and one gas tungsten arc welding (GTAW) process. Finite element (FE) models were developed using the DFLUX subroutine to model the moving heat source and two different approaches for thermal boundary conditions were evaluated using FILM subroutines. The DFLUX and FILM subroutines are presented for educational purposes, as well as a procedure for their verification.

Prediction of weld-induced distortion of large structure using equivalent load technique

2016 ◽  
Vol 232 (3) ◽  
pp. 499-512 ◽  
Author(s):  
Arpan Kumar Mondal ◽  
Anche Lohit ◽  
Pankaj Biswas ◽  
Swarup Bag ◽  
Manas Das
Keyword(s):  
Welding Process ◽  
Residual Deformation ◽  
Computation Time ◽  
Mechanical Analysis ◽  
Angular Distortion ◽  
Computational Time ◽  
Large Structure ◽  
Welded Structure ◽  
Weld Structure ◽  
Equivalent Load

Angular distortion in fusion welded joints is an alarming issue which affects the stability and life of the welded structures, occurs due to the changes in the temperature gradient during the welding process. This degrades the dimensional quality of a large structure during assembly which leads to rework the products and hence decreases the productivity. Predicting the weld-induced residual deformation before the production saves the valuable time and resources for rework. The conventional coupled transient, nonlinear, elasto-plastic thermo-mechanical analysis involves huge computational time. Computing a weld sample of small size with single pass itself takes several hours, which will be a huge amount of time in case of large structures consisting of several welding passes; thus, there is a real need of an efficient alternative technique to predict the post-weld distortions. In this work, an attempt has been made to determine the deformation in a submerged arc welded structure using equivalent load technique which reduces the total analysis time by one-third of the conventional techniques in case of a small weld structure. In this proposed method, the transient nonlinear elasto-plastic structural analysis part which is the major time-consuming part of analysis has been almost eliminated. So, this method can effectively use to predict the weld-induced distortion of very large structure with a computation time almost equal to the time required for transient thermal analysis of a small weld structure only. It is not feasible to analyze such a large welded structure with conventional coupled transient, elasto-plastic, nonlinear thermo-mechanical analysis. The predicted results of distortions have been validated with the experimental as well as published results and good agreements have been found.

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