Advances and trends in plastic forming technologies for welded tubes

Zhan, Mei; Guo, Kailun; Yang, He

doi:10.1016/j.cja.2015.10.011

Cited by 41 publications

(9 citation statements)

References 63 publications

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“…generally carried out by means of tensile tests according to specifications, are not sufficient to guarantee the required standards. Many researchers are focused on solving such problems through the implementation of predictive simulations using a finite element method (FEM) numerical analysis [10][11][12], to predict the behavior of various pipes' geometries in different processing areas, such as hydroforming and bending, or the cold metal forming of steel sheets. Many relevant industrial applications, where a proper procedure of pipe bending and a correct simulation of pipe yielding after bending turns out to be critical, are found in the literature (e.g., [13,14]).…”

Section: Methodsmentioning

confidence: 99%

Predictive Simulation of Plastic Processing of Welded Stainless Steel Pipes

Rufini

Pietro

Schino

2018

Metals

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Metal forming is the most used technique to manufacture complex geometry pieces in the most efficient way, and the technological progress related to the various application fields requires increasingly higher quality standards. In order to achieve such a requirement, people are forced to perform quality and compliance tests finalized to guarantee that these standards are met; this often implies a waste of material and economic resources. In the case of welded stainless steel pipes, several critical points affecting the general trend of subsequent machining need to be taken into account. In this framework, the aim of the paper is to study the effects of different process parameters and geometrical characteristics on various members of the stainless steel family during finite elements method (FEM) simulations. The analysis of the simulation outputs, such as stress, strain, and thickness, is reported through mappings, in order to evaluate their variation, caused by the variation of the simulation input parameters. The feasibility of the simulated process is evaluated through the use of forming limit diagrams (FLD). An experimental validation of the model is performed by comparison with real cases. Major parameters that mainly guide the outcome of the simulations are highlighted.

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Section: Methodsmentioning

confidence: 99%

Predictive Simulation of Plastic Processing of Welded Stainless Steel Pipes

Rufini

Pietro

Schino

2018

Metals

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“…Although the LBW titanium alloy joint has good formability at elevated temperature, the deformation non-uniformity problem remains. According to Zhan et al [18] who conducted a review on plastic forming of welded tubes, there have been limited studies on the inhomogeneous deformation and coordination mechanism of plastic forming of titanium alloy joints, especially for the plastic forming of welded titanium alloy tube.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Correlation between softening mechanisms and deformation non-uniformity of laser-welded titanium alloy tube during gas bulging process

Wang

Liu

Politis

et al. 2017

Materials Characterization

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In this paper, post-weld annealing was carried out to adjust the flow stress difference between weld seam and base material (BM). Deformation non-uniformity of laser-welded titanium alloy tubes before and after annealing was evaluated by gas bulging at 800 °C. Results show that after double annealing (950 °C/2 h, air cooling + 600 °C / 2 h, air cooling), weld seam and BM had similar peak stress at first during tensile test at 800 °C, 0.001 s− 1, then the flow stress difference between them changed dynamically due to different softening rates. The maximum flow stress difference ratio was reduced from 36% to 17% after annealing. Deformation uniformity of the bulged tube was improved by 24.6% after annealing, but the higher softening rate of BM during gas bulging confined its further improvement. At early stage of gas bulging of the annealed tube, the main softening mechanism for weld seam was dynamic recovery and that for BM was globularization of secondary α and phase transformation of α to β. At middle-late stage of gas bulging, the main softening mechanism for weld seam was partial globularization of lamella α and that for BM was wide dynamic recrystallization

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“…The numerical simulation is nowadays an essential tool able to improve the production process in terms of reliability and sustainability; through this method is possible to reduce time to market, cost of developing new components and to have a much more accurate knowledge of processing conditions, like forming [29][30][31][32]. The finite element method (FEM) is one of this approach mainly used for the prediction of forming car body parts [33][34][35], in fact is extremely important guarantee a proper procedure of tube bending and a correct simulation of pipe yielding after bending. During the analysis is also necessary to consider the impact of previous production process which create dispersion in mechanical properties and which show a character no longer deterministic bust stochastic.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Plastic Forming Parameters in Aisi 441 Stainless Steel

Pietro

Napoli

Gaggiotti

et al. 2020

Acta Metall Slovaca

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Plastic deformation is the most common technique adopted to manufacture complex shape pieces in the most efficient way. Even higher requirements need to be faced in the different applications. In order to target such requirement quality and compliance tests are carried out aimed to guarantee that these standards are faced. This often means a waste of material and economic resources. A far as concerns welded stainless steel pipes many criticises affecting the general trend of subsequent machining need to be considered. Such critical issues are more evident in the case of ferritic stainless steel with respect to austenitic ones. Therefore, the study of operating and geometric parameters is fundamental in the production process of ferritic stainless-steel tubes, whose use is mainly for the automotive industry. The possibility to simulate by finite element method (FEM) allows to evaluate the effect of geometric parameters and process constraints on plastic deformation tubes capability, thus allowing to properly fit the plastic deformation process to the target shape as a function of the adopted steel.

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Advances and trends in plastic forming technologies for welded tubes

Cited by 41 publications

References 63 publications

Predictive Simulation of Plastic Processing of Welded Stainless Steel Pipes

Predictive Simulation of Plastic Processing of Welded Stainless Steel Pipes

Correlation between softening mechanisms and deformation non-uniformity of laser-welded titanium alloy tube during gas bulging process

Analysis of Plastic Forming Parameters in Aisi 441 Stainless Steel

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