Nothing is as it seems - A contribution to changes in the base and filler materials during fusion brazing

The heat input and the heat control for thermal processes such as brazing usually lead to changed microstructures of the base and filler materials. The studies described in this article were performed on brazed joints which were manufactured from the X5CrNi18-10 steel (material number: 1.4301) with copper brazing materials and were prepared under reducing protective gas in a continuous furnace. On the one hand, the microstructural changes in the volume of the base material and on its brazing surface are considered and, on the other hand, chemical changes in the process gas atmosphere and in the filler material as well as liquid-metal embrittlement of the transport chain during the brazing process are discussed.