ABSTRACT

Friction stir welding induces a relatively low level of deflection, and residual stresses and recent advances in the welding technology has shown that friction stir welding may now be broadly used in steel welding leading to significant improvement of the welding quality for new constructions and repairs. In the present study experimental and numerical analyses of friction stir welding in thick steel plates are performed. A finite element model is developed, based on a new heat input source mathematical formulation, accounting for the welding transient thermo-mechanical process of the friction stir welding-induced residual stresses. The welding-induced residual stresses, estimated by the new developed finite element model, are compared with the experiment. The present study shows that the newly developed heat source finite element model demonstrates an acceptable agreement between the numerical and experimental results. A sensitivity analysis concerning the essential governing parameters predicting the friction stir welding – induced residual stresses is also addressed.

摘要

搅拌摩擦焊引起的挠度相对较低，残余应力和焊接技术的最新进展表明，搅拌摩擦焊现在可以广泛用于钢焊接，从而显着提高新结构和维修的焊接质量。在本研究中，对厚钢板中的摩擦搅拌焊接进行了实验和数值分析。基于新的热输入源数学公式开发了一个有限元模型，该模型考虑了搅拌摩擦焊引起的残余应力的焊接瞬态热机械过程。通过新开发的有限元模型估计的焊接引起的残余应力与实验进行了比较。本研究表明，新开发的热源有限元模型证明了数值和实验结果之间的可接受一致性。还讨论了关于预测搅拌摩擦焊接的基本控制参数的敏感性分析 - 引起的残余应力。