材料科学
焊接
超声波焊接
计算机科学
算法
复合材料
机械工程
工程类
作者
Michael de Leon,Hyung-Seop Shin
标识
DOI:10.1109/tasc.2024.3357047
摘要
This study investigates the utilization of ultrasonic welding (UW) to establish robust connections between REBCO coated conductor (CC) tapes (4 mm and 12 mm in width) and copper (Cu) sheets (0.2 mm and 1 mm thick) for current lead applications in superconducting magnet systems. Various joint configurations, including both single-layer and multi-layer CC-to-Cu joints, are examined, with welding parameters optimized using the Taguchi method. To enhance joint strength and joint resistance, a hybrid welding approach with solder and flux-free techniques is adopted. Electromechanical assessments conducted at 77 K include critical current ( I c ) measurements, joint electrical resistance ( R j ) evaluations, and lap-shear tests. The results reveal minimal I c degradation, along with acceptable R j values of around 600 nΩ, and lap shear strength of over 700 N, particularly with the configuration of upper-positioned CC tapes on the horn side. Notably, the UW process, especially when implemented in a multi-layer configuration, successfully achieved a joint current capacity of over 1 kA, effectively meeting the rigorous demands of superconducting magnet systems.
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