Engineering Model of Metal Active Gas Welding Process for Efficient Distortion Analysis

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

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

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-013-5184-6 ◽

2013 ◽

Vol 69 (9-12) ◽

pp. 2373-2386 ◽

Cited By ~ 12

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

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Coupling Computation Between Weld Mechanics and Arc Plasma Processes

ASME 2010 Pressure Vessels and Piping Conference: Volume 6, Parts A and B ◽

10.1115/pvp2010-25901 ◽

2010 ◽

Author(s):

Masahito Mochizuki ◽

Shigetaka Okano

Keyword(s):

Temperature Distribution ◽

Computational Simulation ◽

Welding Process ◽

Coupling Model ◽

Inert Gas ◽

Process Conditions ◽

Arc Plasma ◽

Plasma Process ◽

Distortion Analysis ◽

Weld Distortion

A coupling model between arc plasma process and weld mechanics has been developed for the more accurate numerical analysis of weld distortion. Computational simulation of tungsten inert gas arc plasma based on mathematical modeling of the heat transfer from arc plasma to a welded plate is performed to obtain a more precise temperature distribution during welding. The temperature distribution obtained is used for a large-deformation thermal elastic-plastic stress analysis of weld distortion behavior. In addition, the effects of welding process conditions on weld distortion are examined considering molten pool configurations with the arc plasma process, and verified experimentally. Finally, the effectiveness of the weld distortion analysis by combining the arc plasma process with weld mechanics is evaluated.

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Distortion Analysis of Welded Stiffeners

Journal of Ship Production ◽

10.5957/jsp.2001.17.4.226 ◽

2001 ◽

Vol 17 (04) ◽

pp. 226-240 ◽

Cited By ~ 1

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.

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Review of Detecting malingering and deception: Forensic distortion analysis.

Psychotherapy ◽

10.1037/0033-3204.38.2.245a ◽

2001 ◽

Vol 38 (2) ◽

pp. 245-245

Author(s):

T. Richard Saunders

Keyword(s):

Distortion Analysis

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An engineering model for clinical psychology

PsycEXTRA Dataset ◽

10.1037/e578552009-005 ◽

1969 ◽

Author(s):

Richard I. Lanyon ◽

Anthony Broskowski

Keyword(s):

Clinical Psychology ◽

Engineering Model

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Effects of bottom plate in friction stir welding of AA6061-T6

Metallurgical Research & Technology ◽

10.1051/metal/2020087 ◽

2020 ◽

Vol 118 (1) ◽

pp. 108

Author(s):

M.A. Vinayagamoorthi ◽

M. Prince ◽

S. Balasubramanian

Keyword(s):

Mechanical Properties ◽

Axial Load ◽

Weld Zone ◽

Welding Process ◽

Bottom Plate ◽

Welding Parameters ◽

Nugget Zone ◽

Friction Stir ◽

Weld Joints ◽

Fine Grain

The effects of 40 mm width bottom plates on the microstructural modifications and the mechanical properties of a 6 mm thick FSW AA6061-T6 joint have been investigated. The bottom plates are placed partially at the weld zone to absorb and dissipate heat during the welding process. An axial load of 5 to 7 kN, a rotational speed of 500 rpm, and a welding speed of 50 mm/min are employed as welding parameters. The size of the nugget zone (NZ) and heat-affected zone (HAZ) in the weld joints obtained from AISI 1040 steel bottom plate is more significant than that of weld joints obtained using copper bottom plate due to lower thermal conductivity of steel. Also, the weld joints obtained using copper bottom plate have fine grain microstructure due to the dynamic recrystallization. The friction stir welded joints obtained with copper bottom plate have exhibited higher ductility of 8.9% and higher tensile strength of 172 MPa as compared to the joints obtained using a steel bottom plate.

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