Out-of-plane welding distortion prediction and mitigation in stiffened welded structures
Out-of-plane welding distortion prediction and mitigation in stiffened welded structures
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DOI：
10.1007/s00170-015-7810-y
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发表时间：
2015-09
期刊：
影响因子：
--
通讯作者：
N. Ma;Jiangchao Wang;Y. Okumoto
中科院分区：
文献类型：
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作者：
N. Ma;Jiangchao Wang;Y. Okumoto
对几种加筋焊接结构制造过程中的面外焊接变形进行了全面的研究，并考虑了预测和缓解措施。本文首先对典型角焊缝接头及其组合加筋焊接结构进行了试验研究，系统地测量了其面外焊接变形。通过对平行加筋和交叉加筋焊接结构的测量，分别得到了不同的焊接变形模式，即所谓的弯曲变形和焊接屈曲。一个组合的计算方法，其中包括热弹塑性（TEP）有限元（FE）分析，特征值分析，和弹性有限元分析，然后采用预测的平面外焊接变形和澄清不同的焊接变形模式的产生机制。特别是，特征值分析可以支持焊接屈曲发生的临界条件。由于弯曲和焊接屈曲是由不同的原因引起的，因此分别进行了火焰加热缓解过程。具体而言，在焊接接头的相对侧实施线加热以产生反向弯曲，并且采用点加热来加热远离焊接线的区域以消除固有变形对焊接屈曲产生的影响。
A holistic investigation on out-of-plane welding distortion in fabrication of several stiffened welded structures with considering prediction and mitigation is presented. Experiments of typical fillet welded joints and its assembled stiffened welded structures are conducted first, and out-of-plane welding distortion is systematically measured. Different welding distortion patterns, so-called bending distortion and welding buckling, are obviously obtained from the measurements of the examined parallel and cross stiffened welded structures, respectively. A combined computational approach, which involves thermal elastic plastic (TEP) finite element (FE) analysis, eigenvalue analysis, and elastic FE analysis, is then employed to predict the out-of-plane welding distortion and clarify the generation mechanism for different welding distortion patterns. In particular, eigenvalue analysis can support the critical condition for welding buckling occurrence. Since the bending and welding buckling are caused by different reasons, the mitigation processes with flame heating are carried out individually. In detail, line heating is implemented in the opposite side of welded joint to produce inverse bending, and spot heating is employed to heat the region far away from welding line to eliminate effect of inherent deformation on welding buckling generation.