Laser Welding of Copper Using Multi Mode Fiber Lasers at Near Infrared Wavelength
Laser Welding of Copper Using Multi Mode Fiber Lasers at Near Infrared Wavelength
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DOI：
10.1016/j.phpro.2014.08.047
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
S. Liebl;R. Wiedenmann;Andreas Ganser;P. Schmitz;M. Zaeh
中科院分区：
文献类型：
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作者：
S. Liebl;R. Wiedenmann;Andreas Ganser;P. Schmitz;M. Zaeh
由于汽车驱动器的电气化程度不断提高以及分散式可再生能源发电的扩展，用于制造电动机或导电路径等电气部件的铜消耗量增加。为了连接这些部件，激光焊接被更频繁地使用，因为它代表了一种灵活且完全自动化的连接过程。由于铜合金的高导热性、普通激光束源对红外波长的低吸收系数以及由此导致的有限的工艺效率，铜合金的焊接代表了激光辅助工艺的主要挑战。在本文中，实验研究，以确定所产生的过程中的限制纯铜材料的激光焊接与多模光纤激光器在近红外波长取决于所施加的激光功率和焊接速度。此外，一个潜在的稳定的焊接过程的保护气体支持进行了检查。进一步研究了保护气体对熔池几何形状的影响。
Due to the increasing electrification of automotive drives and the expansion of decentralized renewable energygeneration, the consumption of copper for the fabrication of electrical components such as electric motors or conducting paths increases. To jointhese components, laser welding is more frequently used since it represents a flexible and fully automatable joining process. Because of the high thermal conductivity, the low absorption coefficient forinfrared wavelength of common laser beam sources and the resulting limited process efficiency, welding of copper alloys represents a major challenge for laser assisted processes. In this paper, experimental investigationsare presented to identify arising process limits during laser welding of pure copper materials with multi-mode fiber lasers at near infrared wavelength depending on the applied laser power and welding velocity. In addition, a potential stabilization of the welding process by shielding gas support was examined. Further investigations were focused on the influence of shielding gas on the molten pool geometry.