Accurate measurement of residual stresses of 2219-T87 aluminum alloy friction stir welding joints based on properties of joints

Du, Youwei; Li, Huan; Yang, Lijun; Luo, Chuanguang

doi:10.1007/s12206-017-1215-9

Cited by 9 publications

(5 citation statements)

References 25 publications

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“…Especially in the heat-affected zone with large stress gradient, the residual tensile stress rapidly transforms into residual compressive stress up to the base metal, so as to achieve self-balance of the residual stress field. The longitudinal residual stresses in AA2219-T87 friction stir welded joints were 73-138 MPa reported by Du et al [35], which are very close to the measurement results in this work. On the one hand, friction stir welding is a nonuniform heating and cooling process.…”

Section: Distribution Of Welding Residual Stresssupporting

confidence: 91%

Effect of Shot Peening on Redistribution of Residual Stress Field in Friction Stir Welding of 2219 Aluminum Alloy

Nie

Gong

et al. 2020

Materials

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Welding is one of the essential stages in the manufacturing process of mechanical structures. Friction stir welding structure of aluminum alloy has been used as a primary supporting member in aerospace equipment. However, friction stir welding inevitably generates residual stress that promotes the initiation and propagation of cracks, threatening the performance of the welded structure. Shot peening can effectively change the distribution of residual stress and improve the fatigue properties of materials. In this paper, friction stir welding and shot peening are performed on 2219 aluminum alloy plates. The residual stress fields induced by friction stir welding and shot peening are measured by using the X-ray diffraction method and incremental center hole drilling method, and the distribution characteristics of residual stress fields are analyzed. The effect of the pellet diameters and pellet materials used in shot peening on the redistribution of welding residual stress field are investigated. The pellet diameter used in the experiment is in the range of 0.6–1.2 mm, and the pellet material includes glass, steel, and corundum. This study provides guidance for the application of shot peening in friction stir welding structure of 2219 aluminum alloy.

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Section: Distribution Of Welding Residual Stresssupporting

confidence: 91%

Effect of Shot Peening on Redistribution of Residual Stress Field in Friction Stir Welding of 2219 Aluminum Alloy

Nie

Gong

et al. 2020

Materials

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“…From the detailed literature made w.r.t. previously performed FSW based experimental works [26][27][28][29], it was understood that the most dominant tool relevant parameters that were found to have a significant impact on the tensile related properties of the joints includes the rotational speed of the employed tool, speed at which employed tool is traversing, force being exerted axially downwards on the tool, pin and shoulder diameters of the tool, hardness of the employed tool. These process based parameters of the FSW were proven to contribute primarily towards generation of frictional heat and thereby impacting the tensile relevant strength of the joints.…”

Section: Investigation Scheme 21 Parent Metal and Toolmentioning

confidence: 99%

Analysis of sensitivity and formulation of empirical relationship between parameters of FSW process and tensile strength of AZ80A Mg alloy joints

Gunasekaran,

Sevvel,

Vasanthe Roy

et al. 2023

Mater. Res. Express

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In this research paper, an endeavour was made to devise empirical relations amidst the process parameters of friction stir welding (FSW) and tensile relevant strength of AZ80A Mg alloy joints, based on a 6 parameters – 5 levels based central composite design (CCD). Mathematical equations illustrating the impact of process parameters of FSW were formulated based on quadratic regression based analysis to optimize the parameters for attaining superior tensile strength and sensitivity related equations were established from these numerical models. A detailed sensitivity characteristic relevant map for the FSW of AZ80A Mg alloys was established forecasting the fine tuning related prerequisites of the employed FSW parameters. Coefficient of determinant (R2) announced that 99.062% of the overall variability was described by the formulated model and only lower than 1% of the overall variations was not justified by the model. Predicted R2 was also in perfect agreement with the adjusted R2 and announced the model’s capability to demonstrate 95.43% of the variability in the generated data. Highest value of tensile relevant strength (80.77% of the parent metal) was exhibited by the AZ80A Mg alloy joint fabricated under optimized parameters. Tensile relevant strength of AZ80A Mg joints was observed to be highly sensitive to traverse speed of the employed tool.

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“…Even though several researchers [11][12][13][14][15] have focused their experimental works on FSW towards optimizing the process parameters. For instance, Senthil et al [12] in his experimental investiagtion devised a RSM based numerical model involving desirability approach for optimizing the two important parameters of FSW process, namely tool traverse speed and rotational speed during the joining of Al alloy.…”

Section: Introductionmentioning

confidence: 99%

Optimization of parameters and formulation of numerical model employing GRA–PCA and RSM approach for friction stir welded Ti–6Al–4V alloy joints

Babu S D

et al. 2024

Mater. Res. Express

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In this work, an endeavor was made to determine the impact of the tool’s shoulder diameter, pin profile, rotational and traverse speeds on the mechanical properties of the friction stir welded namely Ti–6Al–4V alloy joints. A total of 21 experiments were carried out based on the central composite design (CCD) concept of response surface methodology (RSM). A quadratic regression based numerical model was formulated to ascertain the relationship amidst the parameters of FSW process and the mechanical properties of the fabricated Ti alloy joints. Analysis of variance (ANOVA) was employed to confirm the importance of parameters and their interactive impacts. Optimized process parameter combinations were ascertained by grey relation based analysis (GRA) was coupled together with principal component analysis (PCA), a hybrid based approach. Single score of GRG based response was determined and GRG scores were ranked for all experiments. 1st rank was attained by the experiment no. 20 possessing a GRG score of 2.9989. Optimized values of 25mm shoulder diameter having a taper cylindrical pin geometry employed at a tool traverse speed of 40 mm/min, rotational speed of 1400 rpm resulted in the generation of flaw free Ti alloy joint possessing a largest tensile strength of 809.8 MPa, yield strength of 778.7 MPa and percentage of elongation of 6.9%. SEM based fractography ofTi alloy joint specimens announced that taper cylindrical pin geometry along with 25m shoulder diameter of employed tool have an inevitable part in generating frictional heat in ideal volumes and a perfect stirring action during FSW process.

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Accurate measurement of residual stresses of 2219-T87 aluminum alloy friction stir welding joints based on properties of joints

Cited by 9 publications

References 25 publications

Effect of Shot Peening on Redistribution of Residual Stress Field in Friction Stir Welding of 2219 Aluminum Alloy

Effect of Shot Peening on Redistribution of Residual Stress Field in Friction Stir Welding of 2219 Aluminum Alloy

Analysis of sensitivity and formulation of empirical relationship between parameters of FSW process and tensile strength of AZ80A Mg alloy joints

Optimization of parameters and formulation of numerical model employing GRA–PCA and RSM approach for friction stir welded Ti–6Al–4V alloy joints

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