 Wire and arc additive manufacturing, WAM, is suitable to produce large metallic parts owing to the high deposition rates achieved. The interest in WAM is steadily increasing, and consequently, significant research efforts are underway. An important aspect that still hinders this technology is certification and non-destructive testing of the parts, and this is discussed. This article was authored by Thiago A. Rodriguez, V. Duarte, R. M. Miranda, and others.