Effect of Metal Mixing on Mechanical Performance of Laser Keyhole Welding of Nickel and Copper

Wenkang Huang, W. Tan, W. Cai, Jennifer Bracey
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引用次数: 1

Abstract

In laser keyhole welding of dissimilar metals, metal mixing in the molten pool is critical to the microstructure and mechanical performance of the welds. In this study, metal mixing and its effects on the mechanical performance of the miscible Nickel-Copper welds are investigated. Experiments were carried out to fabricate samples with different welding parameters. Energy-dispersive X-ray spectroscopy is used to characterize the metal distribution in the fusion zone of the post welds. Mechanical strength testing and fractographic analysis are performed to characterize the strength of the welds and the fracture mode. Two regions of different concentrations can be found in the welds, and the concentrations of these two regions vary significantly with welding parameters. The weld strength is dependent on the interfacial region concentration, and the welds undergo a mixture of shear fracture and tensile fracture during the mechanical strength testing process. The interfacial concentration and the weld strength can be controlled by tuning the concentration of the two concentration regions in the fusion zone and the location of the boundary between the two regions. This study provides insights for industries regarding the design and optimization of the laser welding process to achieve welds with optimal mechanical performance.
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金属混合对镍铜激光锁孔焊接力学性能的影响
在异种金属激光锁孔焊接中,熔池中的金属混合对焊缝的显微组织和力学性能至关重要。本文研究了金属混合及其对镍铜混相焊缝力学性能的影响。对不同焊接参数下的样品进行了制备实验。利用能量色散x射线能谱法对后焊缝熔合区的金属分布进行了表征。进行了机械强度测试和断口分析,以表征焊缝的强度和断裂模式。焊缝中存在两个浓度不同的区域,且这两个区域的浓度随焊接参数的变化有显著差异。焊缝强度与界面区域浓度有关,在力学强度测试过程中,焊缝经历剪切断裂和拉伸断裂的混合断裂。通过调整熔合区内两个浓度区域的浓度以及两个区域之间的边界位置,可以控制界面浓度和焊缝强度。本研究为工业提供了设计和优化激光焊接工艺的见解,以实现最佳的焊接机械性能。
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