Welding shape memory alloys with NdYAG lasers
Welding shape memory alloys with NdYAG lasers
复制标题
使用 NdYAG 激光器焊接形状记忆合金
DOI：
10.1590/s0104-92242012000300005
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
R. Miranda
中科院分区：
文献类型：
--
作者：
L. Quintino;R. Miranda
对形状记忆合金 (SMA) 的新兴连接技术的需求变得非常重要，因为它们的功能特性，即形状记忆效应 (SME) 和超弹性 (SE) 为最先进的应用提供了独特的解决方案。由于激光加工后机械性能存在降低的风险，SMA 的焊接是一项挑战。这些合金在航空航天、医疗或电子工业等各个领域的广泛应用因其加工过程的限制而受到阻碍。上述领域的应用迫切需要将 SMA 焊接到其他材料上。在不同的接头中，了解材料行为的需要甚至更具挑战性，因为基础材料具有不同的物理特性，导致不同的热流、对流过程和残余应力分布。焊池的化学成分发生变化，并形成金属间化合物。详细研究激光加工对镍钛合金的影响对于克服其中许多挑战至关重要。当前研究的目的是分析激光焊接对镍钛与不锈钢和钛合金的相似和异种接头焊缝形状的影响。
The demand of emerging joining techniques for shape memory alloys (SMA) has become of great importance, as their functional properties namely shape memory effect (SME) and superelasticity (SE) present unique solutions for state-of-the-art applications. Welding of SMAs is a challenge due to the risk of reduced mechanical performance after laser processing. The wider application of these alloys in various sectors as aerospace, medical or electronic industry is hindered by the limitations in its processing. The need to weld SMAs to other materials is pressing for applications in the above referred sectors. In dissimilar joints the need to understand materials behavior is even more challenging since base materials have different physical properties leading to different heat flow, convection processes and residual stress distribution. The chemical composition across the weld pool varies and intermetallic compounds are formed. Research detailing the effects of laser processing on NiTi is essential to overcome many of these challenges. The objectives of the current study are to analyze the effects of laser welding in the weld shape of both similar and dissimilar joints of NiTi to stainless steel and titanium alloys.