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Welding strength of dissimilar laser-welded NiTi and NiTiCu shape memory wires
摘要： NiTi shape memory alloys are widely used in various medical and aerospace products because of their outstanding properties, namely superelasticity and shape memory effect. Joining of dissimilar NiTi shape memory wires can be applied in the design of smart components made up of different functionalities or properties. However, preserving the shape memory effect of the welded regions is really challenging due to the influence of laser heat on the microstructure and consequently activation temperature of the welded samples. This paper investigates the mechanical properties of the welded NiTi to NiTiCu wires using tensile test and microhardness analysis. In fact, the experimental results allow to identify the optimum operational parameters for joining of dissimilar NiTi shape memory wires.
关键词： Laser Welding,Welding Strength,Dissimilar Joints,Shape Memory Alloys
更新于2025-09-12 10:27:22
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Influence of process parameters on thermal cycle and intermetallic compounds formation in high speed laser weld-brazing of aluminium-steel angle joints
摘要： AA6016-T4 aluminium and DX56D+Z140M steel sheets were joined by fluxless laser weld-brazing process with ER4043 AlSi5 filler wire at high brazing speed. The configuration studied corresponds to typical automotive roof/body-side angle joints. At the interface, the measurements of thermal cycle are performed with K-thermocouples. The results are compared to simulated thermal cycles obtained through SYSWELD Software. Thermal cycles are evaluated with the maximal temperature reached, the time of interaction at high temperature and the cooling speed. Several combinations of laser power and brazing speed are both investigated experimentally and by simulation to study their influence on the thermal cycle and the intermetallic layer thickness. Thermal cycles are discretized to calculate the theoretical growth of the intermetallic compounds with a diffusion-based model. The result is compared to experimental intermetallic layer measured with optical microscopy. The power tends to influence both the maximal temperature and the cooling speed whereas the brazing speed only influences the maximal temperature. The calculation demonstrates the capability to distinguish the process configuration which will lead to the thickest intermetallic layer.
关键词： fluxless laser weld-brazing,simulation,Fe-al dissimilar joints,intermetallic layer calculation,thermal cycle,process parameters
更新于2025-09-12 10:27:22