本文件定义了解决所有熔融金属增材制造（AM）机器重新鉴定的推荐实践。通常，这适用于粉末床熔融(PBF)和送丝或送粉定向能量沉积(DED)技术。等离子体、电子束或激光是适用的能量源。

This document defines a recommended practice for addressing metal additive manufacturing (AM) machine requalification for all fusion-based metal AM machines. In general, this applies to powder bed fusion (PBF) and wire- or powder-fed directed energy deposition (DED) technologies. Plasma, electron beam, or lasers are applicable energy source(s).