This special issue of Journal of Materials Design and Applications (JMDA) contains selected papers presented at the 2nd International Conference on Advanced Joining Processes 2021 (AJP 2021). AJP 2021 was chaired by Lucas F M da Silva (University of Porto, Portugal), Paulo Martins (University of Lisbon, Portugal) and Uwe Reisgen (RWTH Aachen University). It was held at Sintra (Portugal) during 21-22 October 2021 . The chairmen of AJP 2021 conference would like to thank the German scientific society for joining (WGF) for supporting the conference. The goal of the conference was to provide a unique opportunity to exchange information, present the latest results as well as to discuss issues relevant to advanced joining processes. Approximately 170 papers were presented by researchers from more than 20 countries.
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