Experimental and numerical analyses of residual stress distributions in TIG welding process for 304L stainless steel

2008 ◽  
Vol 208 (1-3) ◽  
pp. 383-394 ◽  
Author(s):  
S.A.A. Akbari Mousavi ◽  
R. Miresmaeili
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Welding Process ◽  
Tig Welding ◽  
Numerical Analyses ◽  
304L Stainless Steel ◽  
Stress Distributions

Residual Stress Analysis of TIG Welding Process of Thin-Walled Stainless Steel and Red Copper

2013 ◽  
Vol 834-836 ◽  
pp. 1553-1556
Author(s):  
Han Wu Liu ◽  
Lei Huang ◽  
Xiang Guo ◽  
Yu Long Lv
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Welding Process ◽  
Dissimilar Materials ◽  
Hot Water ◽  
Tig Welding ◽  
Stress Distributions ◽  
Welding Seam ◽  
Junction Area ◽  
Thin Walled

The connecting pipe in solar hot water system is made by TIG welding of thin-walled stainless steel and copper. As the welding of stainless steel and copper belongs to dissimilar metal welding and their physical properties are very different, thus the welding process is difficult and it is likely to cause a variety of defects in the welding process. In this paper, ANSYS software is used to simulate the welding process of stainless steel and copper, and the residual stress distributions in the welding process are obtained. The results show that: at the end of the welding cooling, large residual stress (253MPa) is remained in the junction area of the starting and ending position of welding, which is close to the yield strength of material at the same temperature. Therefore, there will be greater deformation in the junction area and more cracks inside. Meanwhile, the stress distributions of stainless steel and copper tubes in the welding process are greatly different. Different volume changes emerge in two tubes, which are harmful to the welding seam and also leads to the unfitness of dimensional tolerance of welding parts, resulting in the scrapping of welding parts. The results provide references and theoretical basis for the welding technology of dissimilar materials.

Welding Process Development for Spent Nuclear Fuel Canister Repair

2019 ◽  
Author(s):  
Wei Tang ◽  
Stylianos Chatzidakis ◽  
Roger Miller ◽  
Jian Chen ◽  
Doug Kyle ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Nuclear Fuel ◽  
Arc Welding ◽  
Spent Nuclear Fuel ◽  
Welding Process ◽  
Tensile Residual Stress ◽  
304L Stainless Steel ◽  
Welding Temperature ◽  
Stress Direction

Abstract The potential for stress corrosion cracking (SCC) of welded stainless-steel interim storage containers for spent nuclear fuel (SNF) has been identified as a high priority data gap. This paper presents a fusion welding process that was developed for SNF canister repair. Submerged arc welding (SAW) was developed to weld 12.7 mm (0.5 in.) thick 304L stainless steel plates to simulate the initial welds on SNF canisters. The SAW procedure was qualified following ASME Boiler and Pressure Vessel Code requirements. During SAW, the welding temperature was recorded at various locations by using thermocouples. After SAW, weld microstructures were characterized, joint mechanical properties were tested, and the maximum tensile residual stress direction was identified. After SAW procedure qualification, artificial cracks were excavated perpendicular to the maximum tensile residual stress direction in the SAW heat affected zone. Machine cold-wire gas tungsten arc welding (CW-GTAW) was developed and used for repair welding at cracked locations.

Experimental and Numerical Investigations of Residual Stress Distributions in the TIG Welding Process

2008 ◽  
Vol 580-582 ◽  
pp. 331-334
Author(s):  
R. Miresmaeili ◽  
Seiyed Ali Asghar Akbari Mousavi
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Flow Rate ◽  
Gas Flow ◽  
Welding Process ◽  
Tig Welding ◽  
Inert Gas ◽  
Optimum Shape ◽  
Stress Distributions ◽  
Gas Flow Rate

Residual stresses are produced in weldments due to mismatching and non-uniform distributions of plastic and thermal strains. Attempts were made to analyze the residual stresses distributions produced in the TIG welding process using 2d and 3d finite element analyses. No attempts were made to find the optimum shape of grooves and gas flow rate to minimize the tensile residual stresses in the weldments, yet. In this paper, the effects of geometry configurations and inert gas flow rate on the residual stress distributions are presented using the thermo-elastoplastic constitutive equations and compared with the x-ray diffraction method. In this study, convection due to both air and inert gas flow rate along with conduction and radiation are considered.

An Investigation of Dissimilar Welding Aluminum Alloys to Stainless Steel by the Tungsten Inert Gas (TIG) Welding Process

2017 ◽  
Vol 904 ◽  
pp. 19-23
Author(s):  
Van Nhat Nguyen ◽  
Quoc Manh Nguyen ◽  
Dang Thi Huong Thao ◽  
Shyh Chour Huang
Keyword(s):  
Stainless Steel ◽  
Aluminum Alloy ◽  
Welding Process ◽  
Dissimilar Materials ◽  
Welding Current ◽  
Tig Welding ◽  
Inert Gas ◽  
Dissimilar Welding ◽  
Adjacent Area ◽  
Welding Seam

Welding dissimilar materials has been widely applied in industries. Some of them are considered this as a strategy to develop their future technology products. Aluminum alloy and stainless steel have differences in physical, thermal, mechanical and metallurgic properties. However, selecting a suitable welding process and welding rods can solve this problem. This research aimed to investigate the T-joint welding between A6061 aluminum alloy and SUS304 stainless steel using new welding rods, Aluma-Steel by the Tungsten Inert Gas (TIG) welding process. The mechanical properties, the characteristics of microstructure, and component analysis of the welds have been investigated by the mechanical testing, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). As a result, the fracture occurred at the adjacent area between welding seam and A6061 alloys plate. The thermal cracking appeared at central welding-seam along the base metals if high welding current. A large amount of copper elements found in the welds due to using the new welding rod, Aluma-Steel rod.

scholarly journals Investigation of Microstructure and Corrosion Resistance of Dissimilar Welded Joint between 304 Stainless Steel and Pure Copper

2019 ◽  
Vol 1 (3) ◽  
pp. 76-82
Author(s):  
Sorush Niknamian
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Arc Welding ◽  
Pure Copper ◽  
Welding Process ◽  
Steel Part ◽  
304 Stainless Steel ◽  
Dissimilar Metals ◽  
304L Stainless Steel ◽  
Shielded Metal Arc Welding

Nowadays, welding of dissimilar metals has become significant. In this process, a number of parameters including but not limited to type of electrode, amount of current, preheating temperature, and welding rate, that are essential to be taken into account. For welding of dissimilar metals, various methods are exploited including shielded metal arc welding (SMAW) and gas tungsten arc welding (GTAW). The stimulus for studying welding of 304L stainless steel to pure copper originates from difficulties in joining copper parts of           water-circulating molds to their steel part. In this study, the welding is performed on plates of steel and copper using SMAW, GTAW and combined SMAW+GTAW welding methods with    EL-CuMn2, ENiCrMo-6 and ER70S-4 electrodes. In order to investigate the microstructure and corrosion resistance behavior of welds, the samples were characterized using microstructural study and polarization test. It was observed that among all four welding methods, only combined SMAW+GTAW welding process resulted in successful joint between 304L stainless steel and copper. Both obtained joints possess suitable microstructure and corrosion resistance.

Finite Element Analysis Model of Corrosion Fatigue for TIG Welding Workpiece

2016 ◽  
Vol 707 ◽  
pp. 154-158
Author(s):  
Somsak Limwongsakorn ◽  
Wasawat Nakkiew ◽  
Adirek Baisukhan
Keyword(s):  
Residual Stress ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Corrosion Fatigue ◽  
Welding Process ◽  
Simulation Software ◽  
Tig Welding ◽  
Element Analysis ◽  
Fea Model

The proposed finite element analysis (FEA) model was constructed using FEA simulation software, ANSYS program, for determining effects of corrosion fatigue (CF) from TIG welding process on AISI 304 stainless steel workpiece. The FEA model of TIG welding process was developed from Goldak's double ellipsoid moving heat source. In this paper, the residual stress results obtained from the FEA model were consistent with results from the X-ray diffraction (XRD) method. The residual stress was further used as an input in the next step of corrosion fatigue analysis. The predictive CF life result obtained from the FEA CF model were consistent with the value obtained from stress-life curve (S-N curve) from the reference literaturature. Therefore, the proposed FEA of CF model was then used for predicting the corrosion fatigue life on TIG welding workpiece, the results from the model showed the corrosion fatigue life of 1,794 cycles with testing condition of the frequency ( f ) = 0.1 Hz and the equivalent load of 67.5 kN (equal to 150 MPa) with R = 0.25.

FE Predictions of Temperature Distributions in a Multipass Welded Piping Branch Junction

2004 ◽  
Author(s):  
Wei Jiang ◽  
Kadda Yahiaoui ◽  
Chang J. Wang ◽  
Frank R. Hall ◽  
Tahar Laoui
Keyword(s):  
Residual Stress ◽  
Welding Process ◽  
Stress Distributions ◽  
Temperature Dependent ◽  
Material Microstructure ◽  
Temperature Distributions ◽  
Control Schemes ◽  
Complex Temperature ◽  
Walled Cylinder ◽  
Comprehensive Study

This contribution deals with the complex temperature profiles that are generated by the welding process in the intersection region of thick walled, cylinder-cylinder junctions. These affect material microstructure, mechanical properties and residual stresses. Knowledge of the thermal history and temperature distributions are thus critical in developing control schemes for acceptable residual stress distributions to improve in-service component behavior. A comprehensive study of 3D temperature distributions in a stainless steel tee branch junction during a multipass welding process is presented. A newly developed partitioning technique has been used to mesh the complex intersection areas of the welded junction. Various phenomena associated with welding, such as temperature dependent material properties, heat loss by convection and latent heat have been taken into consideration. The temperature distribution at various times after deposition of certain passes and the thermal cycles at various locations are reported. The results obtained in this study will be used for on-going and future analysis of residual stress distributions. The meshing technique and modeling method can also be applied to other curved, multipass welds in complex structures.

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