scholarly journals Numerical Simulation and Experimental Investigation on 2205 Duplex Stainless Steel K-TIG Welded Joint

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1323
Author(s):  
Shuwan Cui ◽  
Shuwen Pang ◽  
Dangqing Pang ◽  
Qin Zhang ◽  
Zhiqing Zhang
Keyword(s):  
Stainless Steel ◽  
Temperature Field ◽  
Heat Source ◽  
Duplex Stainless Steel ◽  
Welding Speed ◽  
Molten Pool ◽  
Thermal Cycle ◽  
Welded Joint ◽  
Welding Process ◽  
Tig Welding

In this paper, 8 mm thickness 2205 duplex stainless steel (DSS) plates were successfully welded using keyhole tungsten inert gas welding (K-TIG) welding, and numerical simulations were performed applying the finite element method. Three models of combined heat source were adopted to verify accuracy of experiment. The welding process under different welding speeds were simulated, and the temperature field, molten pool shape, and thermal cycle curve were calculated. The welding simulation results show that a combined model consisting of the ellipsoid heat source and the conical heat source is more suitable for K-TIG welding. The results of the microstructure analysis of the welded joint showed that when the welding speed was increased from 280 mm/min to 340 mm/min, the austenite content and the ferrite and austenite grain size decreased. The evolution laws of welded joint morphologies, microstructure and grain sizes under different welding speed conditions were consistent with the analysis results of simulated molten pool morphologies, temperature field distributions and thermal cycle curves. It is proved that this kind of simulation method can effectively simulate the K-TIG welding process and ensure the welding quality, which is a guide for industrial applications.

Effect of Thermal Cycle on Microstructure and Corrosion Behavior of Duplex Stainless Steel SAF 2205 Electron Beam Welded Joint

2018 ◽  
Vol 786 ◽  
pp. 119-127
Author(s):  
Sameh M. Khafagy ◽  
Morsy Amin Morsy ◽  
H.M. El Sherbini ◽  
Y.F. Barakat
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Duplex Stainless Steel ◽  
Thermal Cycle ◽  
Welded Joint ◽  
Volume Fraction ◽  
Holding Time ◽  
Σ Phase ◽  
Phase Volume Fraction ◽  
Saf 2205

It is known that heat treatment (HT) highly affects the properties of base metal (BM) and fusion zones (FZ) of duplex stainless steel (DSS). In fact, it may give unwanted structure changes. Duplex stainless steels SAF 2205 welded joint was subjected to thermal cycle at temperature of 850◦C at holding times 1, 3, 5 and 7 hours. The influence of heating cycles and concentration of corrosive medium on the corrosion properties and microstructure of 2205 alloy was the objective of this work. It was found that process led to noticeable decrease in the corrosion resistance of BM and FZ specimens; moreover the decrease was large in BM than FZ. It was also found that sigma phase (σ) precipitated in the different zones of the structure. σ phase volume fraction was found to increase with increasing the holding time of HT, and its increase is larger in BM. Corrosion resistance was found to be oppositely related to σ phase formation. Secondary austenite phase (γ2) was also precipitated and its volume fraction in FZ was found to increase with increasing the holding time of HT and decreased in BM.

INVESTIGATION OF TENSILE BEHAVIOUR OF TIG WELDED 316 STAINLESS STEEL USING TAGUCHI TECHNIQUES

2019 ◽  
Vol 14 (4) ◽  
Author(s):  
Karthimani T ◽  
Babu N
Keyword(s):  
Stainless Steel ◽  
Welding Speed ◽  
Gas Flow ◽  
Welding Process ◽  
Welding Current ◽  
Tig Welding ◽  
Filler Material ◽  
Tensile Behaviour ◽  
Welding Parameters ◽  
Taguchi Technique

This works aims at the analysis and optimization of joining similar grades of stainless steel by TIG welding. TIG welding may use a filler material. There is a variant in the process which does not require filler material. Such process is known as Autogenous TIG welding process. The parameters like current, welding speed and gas flow rate are the variables in the study. The objective of this research is to determine the influence of various welding parameters on the weld bead of 316 SS by using Taguchi technique. A plan of experiments based on Taguchi technique method has been carried out. Orthogonal array, signal to noise (S/N) Ratio, Analysis of variance (ANOVA) are employed for studying the welding characteristics of material & to optimize the weld parameters. The result obtained are the output from each parameter, through which optimal parameters are found out for maximum tensile strength. It is found that -welding current followed by welding speed are major parameters influencing mechanical properties of welded joint

scholarly journals Comparison between PCA analysis and Grey based Taguchi analysis of TIG welding process parameters on Duplex stainless steel

2021 ◽  
pp. 67-74
Author(s):  
Sandip Mondal ◽  
Goutam Nandi ◽  
Pradip Kumar Pal
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Process Parameters ◽  
Gas Flow ◽  
Welding Process ◽  
Principal Component ◽  
Welding Current ◽  
Tig Welding ◽  
Welding Parameters ◽  
Welding Quality

Tungsten inert gas (TIG) welding on Duplex stainless steel (DSS) is more easy, comfortable and useful, if the process is precisely understood and controlled through development of the science & technology. TIG welding on DSS has been performed with the help of specific controlled welding process parameters. Welding quality has been strongly depended on these process parameters. In this study, some valuable welding parameters are chosen. These are welding current, shielding gas flow rate and speed of welding. These process parameters of TIG welding for ASTM/UNS 2205 DSS welds are optimized by using Principal Component Analysis (PCA) method and Grey based Taguchi’s L9 Orthogonal array (OA) experimental plan with the conception of signal to noise ratio (N/S). After that, compression results of above mentioned two analyses of TIG welding process parameters have been calculated. The quality of the TIG welding on DSS has been evaluated in term of ultimate tensile strength, yield strength and percentage of elongation. Compression results of both analyses indicate application feasibility for continuous improvement of welding quality on DSS in different components of chemical, oil and gas industries.

Three-Dimensional Temperature Field Numerical Simulation of Twin-Arc High-Speed Submerged Arc Welding Process Based on ANSYS

2011 ◽  
Vol 216 ◽  
pp. 188-193 ◽  
Author(s):  
Kuan Fang He ◽  
Xue Jun Li ◽  
Ji Gang Wu ◽  
Qi Li
Keyword(s):  
Temperature Field ◽  
Welding Speed ◽  
Arc Welding ◽  
Molten Pool ◽  
High Speed ◽  
Weld Seam ◽  
Welding Process ◽  
Submerged Arc Welding ◽  
Temperature Fields ◽  
Submerged Arc

Based on analysis of submerged arc welding arc heat source model and droplet heat inputting uniform distribution, ANSYS parametric design language was applied to develop sub-program for loading moving heat sources. ANSYS software was used to calculate the temperature fields. In the same welding conditions, weld seam width and depth value of experiments and simulation are contrasted, the biggest error was below 5%. The influence of different welding speed to molten pool temperature of twin-arc submerged arc welding was analyzed, it obtained results that temperature field distribution of twin-arc submerged arc welding changes more gentle than single arc submerged arc welding in condition of increased welding speed, it was helpful to the further analysis of molten pool dynamic behavior and weld seam shape factors of twin-arc high speed submerged arc welding.

Finite-Element Analysis of Heat Generation by Plasma in Welding Temperature Field of Stainless Steel

2011 ◽  
Vol 383-390 ◽  
pp. 6728-6734
Author(s):  
A. Moarrefzadeh ◽  
M.R.Isvand Zibaei
Keyword(s):  
Stainless Steel ◽  
Temperature Field ◽  
Heat Source ◽  
Arc Welding ◽  
Welding Process ◽  
Source Model ◽  
Temperature Fields ◽  
Element Analysis ◽  
Welding Temperature ◽  
Source Models

In this paper, the plasma arc welding is studied and stainless steel temperature field is gained in this process. The available heat source models, either planar one like Gaussian or body ones like double-ellipsoidal and rotary Gaussian modes, are unable to describe the keyhole PAW process accurately. Based on the configuration feature of keyhole PAW welds, a combined heat source model is proposed for the numerical analysis of temperature fields in keyhole PAW process. Numerical simulation of welding process in SIMPELC method and by ANSYS software for gaining the temperature field of stainless steel, the effect of parameter variation on temperature field and process optimization for different cases of plasma and shielding gases(Argon, Helium), are done.

scholarly journals Analysis of post-weld heat treatments of AISI 2205 duplex stainless steel

2021 ◽  
Author(s):  
Geison da Silva Barroso ◽  
Matheus Rangel da Silva ◽  
Henrique Severiano ◽  
Ana Paula Rebuli ◽  
Wagner Monteiro ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Welded Joint ◽  
Welding Process ◽  
Heat Treatments ◽  
Impact Behavior ◽  
Secondary Phases ◽  
Lower Yield Stress ◽  
Significant Difference

Duplex stainless steels are essential for many industries. Regularly used in highly aggressive environments, they often undergo a welding process, whether for joining components or repair operations. This process can modify the ferrite/austenite ratio and form secondary phases, impairing its properties. As a result, in some cases, it is recommended that post-welding heat treatment be carried out to restore the mechanical and metallurgical properties of the welded joint. In this work, the effect of solubilization heat treatment on the mechanical properties of duplex stainless steel welded joints by the autogenous Tungsten Inert Gas (TIG) process is studied. A systematic review was performed in the Scopus database to understand the effects of post-welding heat treatments on microstructure, hardness, tensile and impact behavior. Two solubilization temperatures were chosen through this review: 1050 °C and 1150 °C during 15 min. These thermal treatments were carried out in 3 tensile test specimens of each condition studied, including the welded joint without any heat treatment, called as-received condition. The heat treatments resulted in higher elongation and lower yield stress and stress strength. The one-way ANOVA showed no significant difference between yield strength, tensile strength and elongation between heat-treated conditions specimens. Although, the region where the specimens fractured varied. In the future, a microstructural characterization will be performed to understand the mechanical behavior observed

Numerical Simulation on Temperature and Stress Field of Multi-Pass Welding of Thin Stainless Steel Plate

2013 ◽  
Vol 302 ◽  
pp. 258-262 ◽  
Author(s):  
Yue Chen ◽  
Jian Min Han ◽  
Jun Tan ◽  
Heng Fang Du ◽  
Jun Qiang Wang
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Temperature Field ◽  
Stress Field ◽  
Welding Speed ◽  
Steel Plate ◽  
Welding Process ◽  
Cooling Time ◽  
Welding Parameters ◽  
Stainless Steel Plate

Welding parameters have important affect on welding quality. In this paper, temperature field and residual stress field simulation of thin 316L stainless steel plate are performed by finite element method. The welding process is multi-pass butt TIG(Tungsten Inert Gas) welding. Simulation model are established by SYSWELD code with multi-pass bead. A Gaussian heat source representing the arc energy is verified and the temperature distribution in multilayer welding process is simulated. Then the results are compared with test results measured by thermal-couples. Effects of welding speed and interpass cooling time during multi-pass on temperature field and stress field are studied. The results show that the faster the welding speed and the longer the cooling time, the higher the residual stress will be.

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