Thermal Stresses in a Submerged-Arc Welded Joint Considering Phase Transformations

1978 ◽  
Vol 100 (4) ◽  
pp. 356-362 ◽  
Author(s):  
B. A. B. Andersson
Keyword(s):  
Arc Welding ◽  
Thermal Stresses ◽  
Welded Joint ◽  
Stress Pattern ◽  
Transient Temperature ◽  
Fe Model ◽  
Two Dimensional ◽  
Stress Distributions ◽  
Transient Stress ◽  
Submerged Arc

Transient temperature and stress distributions are analytically and experimentally investigated for a butt welded plate of HT36-steel. A two-dimensional thermal FE-model is shown to represent the temperature distribution sufficiently well in a considered case of submerged-arc welding where a high welding speed is used. A two-dimensional mechanical FE-model is used to find the transient stress pattern. The theoretically and experimentally obtained residual stress distributions show some discrepancies which are believed to be due to Bauschinger effects not considered here.

Numerical and Experimental Analysis of the Thermo-Mechanical Load on Turbine Wheels of Turbochargers

2006 ◽  
Author(s):  
Tom Heuer ◽  
Bertold Engels ◽  
Achim Klein ◽  
Horst Heger
Keyword(s):  
Thermal Stresses ◽  
Mechanical Load ◽  
Experimental Testing ◽  
Transient Temperature ◽  
Heating Process ◽  
Stress Distributions ◽  
Validation Data ◽  
Turbine Wheel ◽  
Turbo Charger ◽  
Design Deficiencies

CFD, FEA, and experimental testing have been combined in order to investigate the lifetime limiting design deficiencies of a turbine wheel in a turbo charger. Thermocouples have been applied to the same radial turbine wheel to provide boundary conditions and validation data for the simulations. The tests have been performed on a turbocharger gas-stand. Based on two steady state CHT-calculations for two distinctly different operating points the heating process of the wheel has been simulated in a transient temperature calculation. Since the resulting temperature gradients induce thermal stresses, the temperature distribution serves as a boundary condition for the subsequent structural analysis. To obtain realistic stress distributions, centrifugal forces also need to be accounted for. In this way, the influence of the thermal stress on the overall stress can be evaluated.

Evaluation of Residual Stresses in Butt Welded Joint of Dissimilar Material by FEM

2017 ◽  
Vol 754 ◽  
pp. 268-271 ◽  
Author(s):  
Raffaele Sepe ◽  
M. Laiso ◽  
A. de Luca ◽  
Francesco Caputo
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Arc Welding ◽  
Structural Integrity ◽  
Welded Joint ◽  
Dissimilar Material ◽  
Fe Model ◽  
Butt Joints ◽  
Integrity Assessment ◽  
Steel Joints

The study proposed within this paper deals with an application of finite element techniques to the thermo-structural analysis of a dissimilar butt-welded joint. Residual stresses induced by the fusion arc-welding of steel joints in power generation plants are a concern to the industry. Nowadays, the application of finite element method appears to be a very efficient method for the prediction and the investigation of the weld-induced residual stresses, nevertheless the detailed modelling of all phenomena involved in such process is still challenging. The structural integrity assessment of welded structures strongly requires a deep investigation of weld-induced residual stresses in order to be compliant with safety requirement of power plant. The longitudinal and transversal residual stresses in dissimilar material butt joints of 8 mm thick for V-groove shape were studied. The developed thermo-mechanical FE model as well as the simulation procedures are detailed and results are discussed. As a result of such work, it has been found out that residual stresses in the two dissimilar plates are characterized by very different magnitudes and distribution.

Effect of Heat Treatment on Impact Strength of Welded Joint Metal Made by Submerged-Arc Welding

Metallurgist ◽  
2018 ◽  
Vol 62 (3-4) ◽  
pp. 254-260 ◽  
Author(s):  
L. A. Efimenko ◽  
T. S. Esiev ◽  
D. V. Ponomarenko ◽  
S. P. Sevast’yanov ◽  
I. Yu. Utkin
Keyword(s):  
Heat Treatment ◽  
Impact Strength ◽  
Arc Welding ◽  
Welded Joint ◽  
Submerged Arc Welding ◽  
Submerged Arc

Studies on Temperature Variation and Angular Distortion in Submerged Arc Welded Butt Joint

2013 ◽  
Vol 699 ◽  
pp. 656-661 ◽  
Author(s):  
Arora Hitesh ◽  
Prince Pal Singh ◽  
Ajay Hooda
Keyword(s):  
Arc Welding ◽  
Welding Process ◽  
Welding Current ◽  
Source Model ◽  
Butt Joint ◽  
Fusion Welding ◽  
Angular Distortion ◽  
Transient Temperature ◽  
Large Structures ◽  
Submerged Arc

Large structures are usually made by joining different elements. Fusion welding is one of the most fundamental technique, which is used to make large metallic joints. During fusion welding a large amount of heat is generated which melts the joint surroundings and a joint is created after solidification. Joint configuration is mostly affected by the material parameters and process type. In this paper, a thermo-mechanical simulation of fusion welding of submerged arc welding is performed using ANSYS. A moving heat source model based on Double-Ellipsoidal heat flux distribution is modelled. The transient temperature distributions and temperature variations of the welded plates are calculated during welding process. Effect of welding speed, welding current on temperature profile and angular distortion of plates is further investigated.

Microstructure and Mechanical Properties of Submerged Arc Welding Filled with Ni Wire Dissimilar Joints Comprising SUS304 and Q245R

2014 ◽  
Vol 936 ◽  
pp. 1780-1785
Author(s):  
Peng Xian Zhang ◽  
Peng Zhao ◽  
Yan Quan Cui
Keyword(s):  
Mechanical Properties ◽  
Weld Metal ◽  
Alloy Steel ◽  
Arc Welding ◽  
Molten Pool ◽  
Welded Joint ◽  
Submerged Arc Welding ◽  
Low Alloy Steel ◽  
Allocation Process ◽  
Submerged Arc

Aim at the issue that the bending crack is easy to generate inside dissimilar welded joint of low alloy steel and stainless steel, a new process of submerged arc welding filled with Ni wire is put forward. The influence mechanism of filling quantity of Ni wire to the joint of microstructure evolutions and mechanical properties is mainly explored based on the contrast test of non-filling Ni wire and three different filling speeds of Ni wire. The experiment results indicate that, the filling process of Ni wire supplies austenite forming element, and alters heat allocation process of molten pool. The filling quantity of Ni wire is the quantitative parameter, it is used to control the transition width between low alloy steel and weld metal, also to adjust the peak temperature and holding time at elevated temperature of molten pool. When the value of the filling quantity of Ni wire is determined, the problem of bending crack in the fusion zone of low alloy steel can be solved, and also the overheat damage can be eliminated. At the same time, the grains of weld metal and heat affected zone are refined. And on this basis the plasticity, toughness and microhardness of welded joint can be guaranteed.

Modeling of Heat Transfer in Pipeline Steel Joint Performed by Submerged Double-Arc Welding Procedure

2013 ◽  
Vol 814 ◽  
pp. 33-40 ◽  
Author(s):  
Dan Catalin Birsan ◽  
Elena Scutelnicu ◽  
Daniel Visan
Keyword(s):  
Heat Transfer ◽  
Arc Welding ◽  
Welded Joint ◽  
Pipeline Steel ◽  
Welding Process ◽  
Temperature Fields ◽  
Welding Procedure ◽  
Thermal Sources ◽  
Submerged Arc ◽  
Process Productivity

Submerged arc welding is the most applicable and productive procedure when thick sections have to be welded. Nevertheless, the manufacturers of pressure vessels, pipelines, ships and offshore structures keep on looking for new and modern design solutions of equipments and technologies which should lead to increase of welding process productivity. For instance, the longitudinal welds of pipelines are, mostly, performed by submerged arc welding procedure with multiple arcs and/or multi-wires, such as twin, tandem or twin-tandem, in order to increase the process productivity. However, achievement of optimal mechanical properties of the welded joint should remain the most important quality criteria. It is well known that dependence of the mechanical and metallurgical changes on heat transfer plays a major role in obtaining of safe welded structures and preserving of their structural integrity. That is why the investigation of heat transfer induced by the welding process is required. Furthermore, setting of distance between thermal sources and its influence on the overlapping phenomenon of temperature fields should be explored when submerged double-arc welding procedure is applied. Three dimensional finite element model of butt welded joint - used for simulation of heat transfer in pipeline steel joint performed by submerged double-arc welding process - is developed and described in this paper. Numerical results and a comparative analysis related to the temperature distribution, thermal history, and temperature variation in cross section of the welded joint at different time steps are discussed. Finally, important conclusions regarding the influence of distance between thermal sources on thermal effects and temperature fields overlapping are drawn.

Thermal Sleeve Design For Pressure Vessels

1973 ◽  
Vol 2 (4) ◽  
pp. 229-234
Author(s):  
S. Venkatasubbu ◽  
P. Desrochers ◽  
C. N. Baronet
Keyword(s):  
Thin Shell ◽  
Welded Joint ◽  
Pressure Vessels ◽  
Transient Temperature ◽  
Stress Distributions ◽  
The Finite Element Method ◽  
Thermal Boundary Conditions ◽  
Pipe Radius ◽  
Maximum Stresses ◽  
Unit Pressure

The maximum stresses induced at the welded joint between a tube carrying a hot fluid and a vessel wall can be reduced by welding a thermal sleeve between them. The design stresses far various combinations of the sleeve and the tube of different mean pipe radius/thickness (R/t) ratios are presented independently for unit pressure and unit temperature of the fluid. The thermo-elastic methods used involved thick and thin shell analyses depending on the R/t ratio of the sleeve. The finite element method was used for the solution of the transient temperature and stress distributions. An experimental investigation was carried out to verify thermal boundary conditions and stress distribution.

An Efficient 2-D Finite Element Procedure for Isothermal Phase Changes

1990 ◽  
Vol 112 (4) ◽  
pp. 352-360 ◽  
Author(s):  
S. Chandrasekar ◽  
S. Wang ◽  
H. T. Y. Yang
Keyword(s):  
Finite Element ◽  
Phase Transformation ◽  
Material Properties ◽  
Thermal Stresses ◽  
Phase Changes ◽  
Transient Temperature ◽  
Two Dimensional ◽  
Transient Temperature Distribution ◽  
Finite Element Procedure ◽  
Transformation Problems

An efficient finite element procedure is developed for the temperature and stress analyses of two-dimensional isothermal phase transformation problems such as solidification, melting, and solid-to-solid transformations, etc. This procedure uses adaptive remeshing along the element boundaries to track the discontinuities in the temperature gradient, the enthalpy, and the material properties, which exists across the phase transformation interface. The thermal stresses and the transient temperature distribution developed during solidification are calculated using this for several example problems. They are compared with the numerical and analytical solutions obtained for these problems by earlier investigators in order to demonstrate the efficiency and accuracy of this method, for the analysis of solidification problems, as well as its limitations.

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