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The high number of depositions required to create or repair parts increases the likelihood of defect formation. If these are reliably detected during manufacturing, timely correction is possible. However, high temperatures and surface irregularity make inspection difficult. Furthermore, depending on the size, morphology, and location of the defect, the part can be rejected. Recent studies have shown that non-destructive testing (NDT) based on different physical phenomena for the timely, reliable, and customized detection of defects can significantly reduce the rejection rate and allow in-line repair, which consequently reduces waste and rework. This paper presents the latest developments in NDT for WAAM and its limitations and potential.<\/jats:p>","DOI":"10.3390\/met13040648","type":"journal-article","created":{"date-parts":[[2023,3,27]],"date-time":"2023-03-27T04:05:40Z","timestamp":1679889940000},"page":"648","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Non-Destructive Testing Inspection for Metal Components Produced Using Wire and Arc Additive Manufacturing"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1020-8388","authenticated-orcid":false,"given":"Douglas S. M.","family":"Serrati","sequence":"first","affiliation":[{"name":"UNIDEMI, Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2825-149 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9352-5196","authenticated-orcid":false,"given":"Miguel A.","family":"Machado","sequence":"additional","affiliation":[{"name":"UNIDEMI, Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2825-149 Caparica, Portugal"},{"name":"Laborat\u00f3rio Associado de Sistemas Inteligentes, LASI, 4800-058 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6906-1870","authenticated-orcid":false,"given":"J. P.","family":"Oliveira","sequence":"additional","affiliation":[{"name":"UNIDEMI, Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2825-149 Caparica, Portugal"},{"name":"CENIMAT|i3N, Department of Materials Science, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9072-5010","authenticated-orcid":false,"given":"Telmo G.","family":"Santos","sequence":"additional","affiliation":[{"name":"UNIDEMI, Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2825-149 Caparica, Portugal"},{"name":"Laborat\u00f3rio Associado de Sistemas Inteligentes, LASI, 4800-058 Guimar\u00e3es, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2023,3,24]]},"reference":[{"key":"ref_1","first-page":"298","article-title":"Non-destructive testing application of radiography and ultrasound for wire and arc additive manufacturing","volume":"21","author":"Lopez","year":"2018","journal-title":"Addit. 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