Numerous studies report a wide range of possible applications for refill friction stir spot welding, reaching from light metal alloys and cast materials to mixed construction applications. In order to make use of these potentials, it is necessary to enhance the tool concept with the aim to increase tool life. Previous studies have reported on different tool life quantities between 5 and 9000 spot welds. Thus, the aim of the present study was to analyse the tool wear and to derive and evaluate suitable measures to reduce it. Therefore, the general properties of the selected coating systems CrVN, WC and TiBN-TiB₂ were determined and compared to a nitrided state. Welding tools were then provided with the respective layers and tested in the process. After 6400 spot welds, the wear on each tool was determined and compared to the others. The results were then related to the preliminary tests in order to assign an influence on the welding behaviour to the individual layer characteristics, e.g. hardness and adhesion strength. With the help of the investigated layers, overall improvements were achieved regarding the tool life, and at the same time, no relevant negative influence on the welding process was detected. Therefore, the described and in published studies proven potentials of the underlying process can be exploited and the process can be brought closer to the applicability in a series production.

大量研究报告表明，从轻金属合金和铸造材料到混合建筑应用，再填充摩擦搅拌点焊都有广泛的可能应用。为了利用这些潜力，有必要增强工具概念以增加工具寿命。先前的研究报道了5至9000个点焊之间不同的工具寿命。因此，本研究的目的是分析工具磨损，并推导和评估减少磨损的适当措施。因此，所选涂层系统CrVN，WC和TiBN-TiB ₂的一般性能确定并与氮化态进行比较。然后为焊接工具提供相应的层并在过程中进行测试。经过6400点焊后，确定每个工具的磨损并将其与其他工具进行比较。然后将结果与初步测试相关，以便将焊​​接行为的影响分配给各个层特性，例如硬度和附着强度。借助于所研究的层，在刀具寿命方面实现了总体改善，同时，未发现对焊接过程产生相关的负面影响。因此，在已描述和已发表的研究中，已被证实的潜在过程的潜力可以被利用，并且该过程可以更接近批量生产中的适用性。