Laser welding of NiTi wires
Laser welding of NiTi wires
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DOI：
10.1016/j.msea.2006.11.179
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发表时间：
2008-05-25
期刊：
影响因子：
6.4
通讯作者：
Theisen, W.
中科院分区：
文献类型：
--
作者：
Gugel, H.;Schuermann, A.;Theisen, W.
镍钛形状记忆合金的特殊性能使其在微工程和医疗技术中得到了广泛的应用。为了将NiTi组件集成到现有部件和模块中，它们通常需要与其他材料连接。出于这个原因，目前的贡献涉及薄的伪弹性NiTi线（100 μ m）与Nd：YAG激光器的激光焊接。基于广泛的参数研究，产生了无缺陷接头。本研究涉及的熔合区和热影响区发生的结构变化，在静态拉伸试验和功能疲劳的接头的性能。结果表明，NiTi/NiTi接头的抗拉强度达到纯NiTi丝的75%左右。对于将NiTi焊接到钢，不使用中间层。异种NiTi/钢接头在熔合区和热影响区提供高于平台应力水平的结合强度。NiTi/钢细丝接头作为一个新的方面，使可能受益于NiTi成分的伪弹性性能。(c)2007 Elsevier B.V.保留所有权利。
The special proper-ties of nickel-titanium shape memory alloys are currently used in micro-engineering and medical technology. In order to integrate NiTi components into existing parts and modules, they often need to be joined to other materials. For this reason, the present contribution deals with the laser welding of thin pseudoelastic NiTi wires (100 mu m) with an Nd:YAG laser. Based on extensive parameter studies, faultless joints were produced. This study deals with the structural changes occurring in the fusion and heat-affected zones, the performance of the joints in static tensile tests and their functional fatigue. It can be shown that NiTi/NiTi joints reach about 75% of the ultimate tensile strength of pure NiTi wires. For welding NiTi to steel, no interlayer was used. The dissimilar NiTi/steel joints provide a bonding strength in the fusion and heat-affected zones higher than the plateau stress level. NiTi/steel joints of thin wires, as a new aspect, enable the possibility to benefit from the pseudoclastic proper-ties of the NiTi component. (c) 2007 Elsevier B.V. All rights reserved.