Available fatigue recommendations are typically developed for arc-welded joints. Some of them may need to be adjusted to fit fatigue life of joints manufactured with non-conventional welding techniques since they show different mechanical properties. Laser beam and friction stir welded butt and overlap joints made from aluminium are addressed in this paper focused on a comparison between different fatigue assessment methods. For an evaluation, S-N data from published papers was collected. Additionally, fatigue tests on laser beam and friction stir welded overlap joints were carried out. For a fatigue assessment, the nominal stress, notch stress and effective stress approach were applied. The comparison of the endurable nominal stresses showed a comparatively high fatigue strength of the tested friction stir welded overlap joints in comparison to literature data. The notches at the interface of the overlap joints were observed to have an asymmetric geometry compared to the common symmetric one, frequently found in literature, leading to a lower stress concentration. A comparison between endurable nominal stresses and the classes FAT 28 for butt welded and FAT 12 for overlap welded joints resulted in a conservative design for the majority of specimens. An evaluation based on notch stresses lead to partly non-conservative results that could be explained by the mild notches present at the laser-beam welded butt joints. For the effective stress approach, an evaluation of the micro-structural length was performed and a FAT-value is proposed.

通常会为弧焊接头制定可用的疲劳建议。由于它们具有不同的机械性能，因此可能需要对其中一些进行调整，以适应使用非常规焊接技术制造的接头的疲劳寿命。本文着重介绍了铝制的激光束和摩擦搅拌焊对接和搭接接头，着重于不同疲劳评估方法之间的比较。为了进行评估，收集了已发表论文的SN数据。此外，还对激光束和搅拌摩擦焊接的搭接接头进行了疲劳测试。为了进行疲劳评估，使用了标称应力，缺口应力和有效应力方法。承受的公称应力的比较表明，与文献数据相比，经测试的搅拌摩擦焊接搭接接头具有较高的疲劳强度。与文献中常见的常见对称凹口相比，重叠接头界面处的凹口具有不对称几何形状，从而导致较低的应力集中。承受的公称应力与对接焊缝的FAT 28级和搭接焊缝的FAT 12级之间的比较导致了大多数试样的保守设计。基于缺口应力的评估会导致部分不保守的结果，这可以用激光束焊接对接接头处出现的轻微缺口来解释。对于有效的压力方法，