The joining of thick-walled components using beam-based joining techniques is content of worldwide research and development activities, but has not yet been established in industry. State of the art to weld nickel super alloys is currently a TIG narrow-gap welding. The present paper is focusing on a new specific laser beam welding process, the so-called Laser Multi-Pass Narrow-Gap welding (Laser-MPNG). It first explains the process principle based on 2D beam oscillation, the use of fiber lasers and the multi-pass principle. The potential of the Laser-MPNG welding process is demonstrated using the technically significant nickel-based material Alloy 617 occ. As a result, it was possible for the first time to realize a weld with a wall thickness of 140 mm free of cracks or bonding defects. Promising results of creep and low-cycle fatigue tests are used to show the potential that Laser-MPNG welded joints would have for future industrial applications.

使用基于梁的连接技术来连接厚壁部件是全球研究和开发活动的内容，但在工业上尚未建立。目前，焊接镍超级合金的技术水平是TIG窄间隙焊接。本文着重于一种新的特定激光束焊接工艺，即所谓的激光多道窄缝焊接（Laser-MPNG）。首先说明了基于2D光束振荡的处理原理，光纤激光器的使用和多次通过原理。使用技术上重要的镍基材料Alloy 617 occ证明了Laser-MPNG焊接工艺的潜力。结果，首次可以实现壁厚为140 mm的无裂纹或粘结缺陷的焊缝。