EH36钢药芯焊丝电弧焊接接头冲击及抗冷裂性能研究  

Research on the Impact and Cold Cracking Resistance of EH36 Steel Flux Cored Wire Arc Welding Joint

作　　者：苏沫林 韩永典[1,2] 赵雷[1,2] 徐连勇[1,2] 郭慧娟 SU Molin;HAN Yongdian;ZHAO Lei;XU Lianyong;GUO Huijuan(School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China;Tianjin Key Laboratory of Advanced Joining Technology,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学材料科学与工程学院,天津300350 [2]天津大学天津市现代连接技术重点实验室,天津300350

出　　处：《焊管》2021年第7期18-22,共5页Welded Pipe and Tube

基　　金：工信部高技术船舶科研项目经费资助“深水半潜式生产储卸油平台工程开发”(项目编号SSBQ-2020-HN-01-04)。

摘　　要：为了研究EH36钢在海洋工程结构件中的冷裂现象,采用刚性拘束焊接冷裂试验装置制备了GFL-71Ni和DW-A55L药芯焊丝电弧焊(FCAW-G)焊接接头,并对其进行扩散氢含量测试、焊缝化学成分分析以及冲击性能试验。试验结果显示,DW-A55L焊丝接头的扩散氢含量低于GFL-71Ni焊丝接头;两种焊丝接头焊缝的冲击功分别为19.7 J和20.5 J,均比熔合线+1 mm处的冲击功低;GFL-71Ni焊丝接头熔合线+1 mm处的冲击功比DW-A55L焊丝稍高,二者的冲击功分别为(36.4±1.6)J和(31.9±3.4)J。研究表明,两种焊丝焊接接头均具有良好的抗冷裂性能,且DW-A55L焊丝接头的抗冷裂性能优于GFL-71Ni焊丝。In order to study the cold cracking phenomenon of EH36 steel in offshore engineering structures,GFL-71Ni and DW-A55L flux cored wire arc welding(FCAW-G)welded joints were prepared by using a rigid restraint welding cold cracking test device,and the diffusion hydrogen content,chemical composition and impact performance of the welded joints were tested.The results show that the diffusion hydrogen content of DW-A55L welding wire joint is lower than that of GFL-71Ni welding wire joint.The impact energy of two kinds of welding wire joint is 19.7 J and 20.5 J respectively,which is lower than that of fusion line+1 mm.The impact energy at the fusion line of GFL-71Ni welding wire joint+1 mm is slightly higher than that of DW-A55L wire,and the impact energy of both is(36.4±1.6)J and(31.9±3.4)J respectively.The results show that both welding wire joints have good cold cracking resistance,and the cold cracking resistance of DW-A55L welding wire joints is better than GFL-71Ni wire.

关 键 词：EH36钢 气保护药芯焊丝电弧焊 焊接接头 刚性拘束焊接冷裂试验 冲击试验 冷裂纹 

分 类 号：TG113.25[金属学及工艺—物理冶金]