DIN EN 14730-2:2021
铁路应用 轨道 铁轨的铝热焊接 第2部分:铝热焊工的资格、承包商的认可和焊缝的验收;德文版 EN 14730-2:2021
Railway applications - Track - Aluminothermic welding of rails - Part 2: Qualification of aluminothermic welders, approval of contractors and acceptance of welds; German version EN 14730-2:2021