Abstract To increase the capability to weld copper using laser radiation, Direct Laser Interference Patterning is used for producing different surface textures with increased optical absorptivity. Depending on the depth of the produced patterns, the absorptivity of copper for a laser wavelength of 1070 nm was almost trebled from 4%, corresponding to a polished flat reference surface, to 11.3%. The last value equals the absorptivity of liquid copper, which permitted to obtain a temporally homogenous temperature distribution during the welding process, independently of the material temperature as well as material phase. Corresponding welding trials showed an increased stability and a continuous weld seam cross section using fiber lasers in the infrared.

中文翻译：

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量身定制的吸收率：通过表面结构化提高铜的激光焊接性

摘要 为了提高使用激光辐射焊接铜的能力，直接激光干涉图案化用于产生具有增加光吸收率的不同表面纹理。根据所产生图案的深度，铜对 1070 nm 激光波长的吸收率几乎翻了三倍，从对应于抛光平坦参考表面的 4% 增加到 11.3%。最后一个值等于液态铜的吸收率，它允许在焊接过程中获得时间均匀的温度分布，与材料温度和材料相无关。相应的焊接试验表明，使用红外线光纤激光器提高了稳定性和连续的焊缝横截面。