Detection of oxidation process of metal condensate

The invention relates to a method for oxidizing welding fume residues of an additive manufacturing device, which is designed for processing metal-based building materials. The invention relates to an additive manufacturing device (1) having a process chamber (3) for manufacturing a three-dimensional object (2) and a recirculation system (31, 32, 33, 34, 35, 40) having a gas circuit for a protective gas which is guided through the process chamber (3). In the method, the welding fume residue is exposed to an oxidizing agent in a chamber for a passivation period of time, where the passivation period of time ends based on a difference between oxidizing agent concentrations in the chamber detected by at least one sensor at two points in time separated by a delay. 本发明涉及一种用于氧化增材制造装置的焊接烟尘残渣的方法，所述增材制造装置被设计用于加工金属基构建材料。所述增材制造装置具有用于制造三维物体(2)的工艺腔室(3)和具有用于保护气体的气体回路的再循环系统(31、32、33、34、35、40)，所述保护气体被引导通过工艺腔室(3)。在所述方法中，所述焊接烟尘残渣在钝化时间段内暴露于腔室中的氧化剂，其中，所述钝化时间段基于由至少一个传感器在由延迟分开的两个时间点检测到的在所述腔室中的氧化剂浓度之间的差而结束。