Abstract The increasing miniaturization of components leads to increasing demands on manufacturing processes. High-brilliance lasers allow fast, low-heat deep penetration laser welding to produce narrow seams even in metal foils. In micro-joining, adjusting comparatively small gaps is a major challenge. Here, the welding of 100 µm thick aluminum foils in lap joints is investigated. Gaps of > 80% of the foil thickness were bridged. The results show that the seam width can be used to detect not only the gap size but also inner connection defects for quality control purposes. The explanation for this is the increasing gap-bridging keyhole depth, and thus heat input with increasing gap size.

中文翻译：

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即使间隙尺寸较大，铝箔与搭接接头的激光锁孔微焊接

摘要 随着零部件的日益小型化，对制造工艺的要求也越来越高。高亮度激光允许快速、低热量的深熔激光焊接，即使在金属箔中也能产生窄接缝。在微连接中，调整相对较小的间隙是一项重大挑战。在这里，研究了在搭接接头中焊接 100 µm 厚的铝箔。超过箔厚度 80% 的间隙被桥接。结果表明，接缝宽度不仅可用于检测间隙尺寸，还可用于检测内部连接缺陷，以实现质量控制。对此的解释是间隙桥接锁孔深度增加，因此热量输入随着间隙尺寸的增加而增加。