Welding of pipes in fixed position with internal anti-corrosion protection of jointsElena Bogomazova, Irina Ziyatdinova, Dmitriy Aiduganov, Anna Pershina and Alexey AnikeyevE3S Web of Conf., 225 (2021) 05005DOI: https://doi.org/10.1051/e3sconf/202122505005