工艺与设备第46卷第3期2023年3月Vol.46No.3Mar.2023HANGUAN焊管WELDEDPIPEANDTUBE海上风机基础用S355NL直缝焊管双丝埋弧焊工艺设计葛兰1,彭静1,郑家胜1,许峰2(1.合肥紫金钢管股份有限公司,合肥230051;2.合肥高科科技股份有限公司,合肥230051)摘要:S355NL细晶粒结构钢以其优异的性能在海上风电、石油平台、焊接钢管等方面得到广泛应用。为进一步提高焊接钢管的生产效率,获得性能优良的海上风机基础用钢管焊接接头,开展S355NL直缝焊管的焊接工艺研究。采用双丝埋弧焊方式,选用低镍合金焊材,不仅能够细化焊缝组织晶粒,同时降低淬硬倾向,提高S355NL直缝焊管焊缝的低温冲击韧性。在焊接过程中采用多层多道焊接,控制热输入≤5.0kJ/mm,减少熔合区和热影响区在高温区域停留时间,保证熔合线和热影响区冲击性能。试验结果表明,该工艺所制试板及成品焊管各项力学性能试验合格,能够满足-40℃夏比冲击试验要求。生产应用表明,该焊接工艺制定及焊材选配正确恰当,能够提高焊接生产效率。关键词:S355NL;海上风机;直缝焊管;双丝埋弧焊;冲击性能中图分类号:TG445文献标识码:BDOI:10.19291/j.cnki.1001-3938.2023.03.009Double⁃WireSubmergedArcWeldingProcessDesignofS355NLLongitudinalWeldedPipeforOffshoreWindTurbineFoundationGELan1,PENGJing1,ZHENGJiasheng1,XUFeng2(1.HefeiZikingSteelPipeCo.,Ltd.,Hefei230051,China;2.HefeiGaocoTechnologyCo.,Ltd.,Hefei230051,China)Abstract:S355NLfine⁃grainedstructuralsteelhasbeenwidelyusedinoffshorewindpower,oilplatforms,weldedsteelpipesandotherfieldsduetoitsexcellentperformance.Inordertofurtherimprovetheproductionefficiencyofweldedsteelpipeandobtaintheweldedjointofsteelpipeforoffshorewindturbinefoundationwithexcellentperformance,theweldingprocessresearchofS355NLlongitudinalweldedpipewascarriedout.Adoptingdouble⁃wiresubmergedarcweldingandlow⁃nickelalloyweldingmaterialcannotonlyrefinethegrainofweld,butalsoreducethehardeningtendencyandimprovethelow⁃temperatureimpacttoughnessofS355NLlongitudinalweldedpipeweld.Multi⁃layerandmulti⁃passweldingisadoptedintheweldingprocess,theheatinputiscontrolledtobe≤5.0kJ/mm,theresidencetimeoffusionzoneandheataffectedzoneinthehightemperaturezoneisreduced,andtheimpactperformanc...