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ExExperimental and numerical studies on the prediction of bendability limit of QSTE340 welded tube in NC bending process

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Science China(Technological Sciences) 2012年第8期55卷 2264-2277页

作者： YANG He REN Ning ZHAN Mei ZHANG ZhiYong QIN YaTao JIANG HaoMin DIAO KeShan CHEN XinPing State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China Baosteel Group Corporation Shanghai 200122China

For a low carbon steel tube with small wall factor D/t and bending radius R,the over-thinning induced localized necking is one dominant failure in tube numerical control(NC) bending process,which strongly restricts the bendability limit of the *** addition,the deterioration of bendability of a tube is increased by the existence of the weak weld ***,an important issue is how to determinate and predict the welded tube bendability *** the present study,a finite element(FE) model with weld and subdivided heat affected zones under ABAQUS platform is employed to explore the deformation behaviors of welded tube NC bending.A localized necking criterion based on the critical thickness thinning is used to predict the critical principal strains,critical bending radius and burst location during the forming *** is found that the failures always occur at the rigid supporting point of mandrel flexible balls near the tangent point at the outside of the bend,where the wall thickness of the tube is the *** bending limit curves(BLCs) of the QSTE340 welded tube are obtained by shifting the standard shaped forming limit curve to the critical principal strains along the major strain *** between the numerical and experimental results has shown that the BLC and critical bending radius predictions agree well with the experimental *** addition,the effect of weld positions on BLC is discussed,the weld region shows an almost negligible effect on the forming limit at a non-critical location that is far away from the outside of the ***,when the weld is at the large tensile deformation region on the outside of the bend,a decrease of the forming limit strains is seen.

关键词： bendability limit welded tube NC bending FE simulation critical thickness thinning

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Weld Characteristics and NC Bending Formability of QSTE340 welded tube

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Transactions of Tianjin University 2011年第4期17卷 288-292页

作者：任宁詹梅杨合秦亚涛张志勇蒋浩民刁可山陈新平 State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University Baosteel Group Corporation

The mechanical characteristics of the weld joint were investigated by tensile test, microstructure test, and microhardness test. The welded tube NC bending tests were carried out to evaluate the weld on the formability of the QSTE340 welded tube. The results show that the wall thinning degree, cross-sectional deformation and springback angle increase significantly as the weld line is located on the outside of the bend compared with that located on the middle and inside, and the welded tubes produce nearly identical performance as the weld line is located on the middle and inside. The wall thickening degree decreases much as the weld line is located on the inside of the bend. So the welded tube can acquire good bending formability as the weld line is located in the region away from the outside of the bend.

关键词： weld characteristic NC bending formability welded tube

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Advances and trends in plastic forming technologies for welded tubes

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Chinese Journal of Aeronautics 2016年第2期29卷 305-315页

作者： Zhan Mei Guo Kun Yang He State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical University

With the implementation of environmental protection, sustainable development and conservation-oriented policies, components and parts of thin-walled welded tubes have gained increasing application in the aircraft and automotive industries because of their advantages： easily achieving forming and manufacturing process at low cost and in a short time. The current research on welded tube plastic forming is mainly concentrated on tube internal high-pressure forming, tube bending forming, and tube spinning forming. The focuses are on the material properties and char- acterization of welded tubes, finite element modeling for welded tube forming, and inhomogeneous deformation behavior and the mechanism and rules of deformation coordination in welded tube plastic forming. This paper summarizes the research progress in welded tube plastic forming from these aspects. Finally, with a focus on the urgent demand of the aviation, aerospace and automotive industries for high-strength and light-weight tubes, this paper discusses the development trends and challenges in the theory and technology of welded tube plastic forming in the future. Among them, laser tailor-welded technology will find application in the manufacture of high-strength steel tubes. tube-end forming technology, such as tube flaring and flanging technology, will expand its appli- cation in welded tubes. Therefore, future studies will focus on the FE modeling regarding how to consider effects of welding on residual stresses, welding distortions and microstructure, the inhomo- geneous deformation and coordination mechanism of the plastic forming process of tailor-welded tubes, and some end-forming processes of welded tubes, and more comprehensive research on the formin~ mechanism and limit of welded tubes.

关键词： Constraint effects Deformation coordination Finite element modeling Forming Forming limit Inhomogeneous deforma-tion Material characteristics welded tube

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