摘要
[目的]半潜式起重拆解平台的分段焊接变形直接影响着整个平台的尺寸精度和建造周期。[方法]为此,以典型的B514分段为研究对象,首先预测其焊接面外变形的趋势及数值,分析反变形施加以及焊接顺序优化的影响,提升分段结构的建造精度;然后,依据焊接规范梳理平台结构的主要接头类型及焊接工艺,并通过高效的热−弹−塑性有限元分析,研究典型接头的热−力学响应,获得对应的焊接固有变形;最后,将焊接固有变形作为力学载荷,通过弹性有限元计算,预测B514分段的整体建造精度,同时研究施加反变形和不同焊接顺序对分段建造精度的影响。[结果]基于固有变形的弹性有限元分析,所预测的面外变形与实际测量结果基本吻合,给出了面外变形的产生机理。[结论]通过高效的有限元分析,可以获得并构建焊接固有变形数据库,从而用于复杂分段结构的焊接变形预测,并且施加反变形和焊接顺序优化能有效降低焊接面外变形。
[Objectives]The welding distortion of block structures in the fabrication of semi-submersible lifting and disassembly platforms influences their dimensional accuracy and production schedule.[Methods]Thus,taking a B514 block as the research object,the tendency and magnitude of its out-of-plane welding distortion are predicted in advance,and the influence of inverse deformation and welding sequence are examined for fabrication accuracy enhancement.Next,typical welded joints and their welding conditions are summarized,and effective thermal-elastic-plastic finite element(FE)computation is carried out to examine the thermal-mechanical response and evaluate the inherent welding deformation.With inherent deformation as mechanical loading,elastic FE analysis is then employed to predict the dimensional accuracy of the B514 block.Moreover,the influences of inverse deformation application and different welding sequences on dimensional accuracy are also examined.[Results]Based on elastic FE analysis with inherent deformation,the computed out-of-plane welding distortion is found to be in good agreement with the measurement,and its generation mechanism is also clarified.[Conclusions]Effective FE analysis can be employed to predict the inherent deformation and distortion of complex welded structures;moreover,inverse deformation application and an optimized welding sequence can significantly reduce welding distortion.
作者
王江超
张宏
杨润畴
刘建成
周宏
WANG Jiangchao;ZHANG Hong;YANG Runchou;LIU Jiancheng;ZHOU Hong(School of Naval Architecture and Ocean Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,Shanghai 200240,China;Guangzhou Shipyard International Co.,Ltd,Guangzhou 511462,China;China Merchants Heavy Industry(Jiangsu)Co.,Ltd,Nantong 226116,China;School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China)
出处
《中国舰船研究》
CSCD
北大核心
2021年第6期166-175,共10页
Chinese Journal of Ship Research
基金
工业和信息化部高技术船舶专项基金资助项目(614(2017))。
关键词
起重拆解平台
焊接面外变形
焊接固有变形
反变形
焊接顺序
lifting and disassembly platform
out-of-plane welding distortion
welding inherent deformation
inverse deformation
welding sequence
