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Welding-induced residual stresses and distortions of butt-welded corroded and intact plates

机译：焊接诱导的剩余应力和对焊接腐蚀和完整板的扭曲

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摘要

The welding-induced residual stresses and distortions of butt-welds between non-corroded and corroded steel plates are studied experimentally and numerically, simulating a repair in an aged structure. Butt welds are made between plates with different corrosion levels and intact ones, and temperature distributions and distortions have been measured. Finite element analyses of the butt-welded corroded and non-corroded plates are performed to estimate the welding-induced distortions and residual stresses for different levels of corrosion degradation. The environmental conditions during the welding repair process are also accounted for. Experimentally evaluated mechanical properties of corroded steel plates as a function of the temperature during the welding process are employed in non-linear finite element analyses. The importance of the material properties as a function of the severity of the steel plates' corrosion degradation on the welding-induced distortions and residual stresses is also quantified. This study shows the importance of considering the ageing of steel in the repair process. The developed methodology allows critical operational decisions to be made with greater ease and confidence in analysing the welding-induced distortions and residual stresses when ageing structures are repaired to extend their service life. Furthermore, different welding sequence scenarios may be analysed to identify the most appropriate repair solution in minimising the repair cost.
机译：在实验和数值上研究了非腐蚀和腐蚀钢板之间的焊接诱导的残余应力和对接焊缝的扭曲，模拟了老化结构的修复。对接焊缝在具有不同腐蚀水平和完整的腐蚀水平和完整的板之间进行，并且测量了温度分布和失真。进行对接焊接腐蚀和非腐蚀板的有限元分析，以估计焊接诱导的腐蚀和残余应力，以进行不同水平的腐蚀降解。还占了焊接修复过程中的环境条件。在非线性有限元分析中使用作为焊接过程温度的腐蚀钢板的实验评估的腐蚀钢板的机械性能。还量化了作为钢板腐蚀降解对焊接诱导的失真和残余应力的函数的函数的重要性。本研究表明了考虑维修过程中钢老化的重要性。开发的方法允许在修复老化结构以延长其使用寿命时，以更轻松地进行批判性操作决策。此外，可以分析不同的焊接序列情景以确定最小化修复成本的最合适的修复解决方案。

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