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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Tandem laser-gas metal arc welding joining of 20 mm thick super duplex stainless steel: An experimental and numerical study
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Tandem laser-gas metal arc welding joining of 20 mm thick super duplex stainless steel: An experimental and numerical study

机译：串联激光气体金属电弧焊接加入20毫米厚的超双工不锈钢：实验和数值研究

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摘要

The present work covers the topic of strains and stresses prediction in case of welded steel structures. Steel sheets of 20 mm thickness made in UR (TM) 2507Cu are welded using a laser and gas metal arc welding processes combination. The focused laser beam leads the arc in a Y-shape chamfer geometry. Both sources are 20 mm apart from each other in order to avoid any synergic effect with each other. In order to predict residual strain, a 3D unsteady numerical simulation has been developed in COMSOL finite element software. A volume heat source has been identified based on the temperature measurements made by 10 K-type thermocouples, implanted inside the workpiece. The 50 mm deep holes are drilled in the workpiece using dye-sinking Electrical Discharge Machining (EDM) machine. Before the implantation in the hole, each thermocouple is surrounded by Inconel sheathing. Hot junctions of the thermocouples are positioned in a way to feel two advancing molten pools. The equivalent heat source is composed of three sources. First one is a Goldak source that represents the molten pool induced by gas metal arc welding. The second one is a cylinder with an elliptic cross-section that represents the focused laser beam penetrating into the workpiece. The third one is a surface Gaussian source that represents energy radiated by arc and blocked by workpiece surface. Concerning mechanical simulation, an elasto-plastic behavior with isotropic hardening is implemented. A weak coupling is established between equations governing heat transfer and mechanics thanks to the temperature dependent coefficient of linear expansion. This numerical simulation made with some simplifying assumptions predicts an angular distortion and a longitudinal shrinkage of the welded structure. The numerical results are consistent with the displacements measured by digital image correlation method.
机译：目前的工作涵盖了焊接钢结构的菌株的主题和应力预测。使用激光和气体金属电弧焊接工艺组合焊接在UR（TM）2507CU中制造的20mm厚的钢板。聚焦激光束在Y形倒角几何形状中引导电弧。两个来源彼此间隔20毫米，以避免彼此的任何协同效果。为了预测残留应变，在COMSOL有限元件中开发了3D不稳定数值模拟。已经基于10 k型热电偶制成的温度测量来识别体积热源，植入工件内部。使用染料下沉电气放电加工（EDM）机器在工件中钻出50mm深孔。在植入孔之前，每个热电偶都被护套所包围。热电偶的热连接以一种感觉两个推进的熔池的方式定位。等效热源由三个来源组成。第一个是代表气体金属电弧焊接引起的熔池的Golyak源。第二个是具有椭圆形横截面的圆柱，其代表渗透到工件中的聚焦激光束。第三个是表面高斯源，其表示通过电弧辐射的能量并被工件表面阻挡。关于机械模拟，实施了具有各向同性硬化的弹性塑性行为。由于温度相关系数的线性膨胀系数，在传热和力学方程之间建立了弱耦合。用一些简化假设进行的这种数值模拟预测了焊接结构的角度失真和纵向收缩。数值结果与通过数字图像相关方法测量的位移一致。

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