大间隙FAB埋弧焊焊接试验及接头性能
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摘要
对两种相同成分、不同厚度的DH36船用钢板进行大间隙不同填充材料的FAB埋弧焊接试验,分析焊接接头力学性能和微观组织特点。结果表明:采用FAB埋弧焊打底及埋弧焊填充盖面的工艺焊接后的接头抗拉强度、弯曲性能、硬度值、冲击韧性等性能指标都能满足规范要求;焊缝中心是整个接头冲击韧性最薄弱位置,表面焊缝中心采用多层多道焊接,其冲击值高于根部;填充材料碎焊丝和铁粉成分不同,但对于根部焊缝中心冲击值的影响不大;母材采用TMCP工艺制造及低碳成分设计,热影响区组织粗化不明显,冲击韧性良好。
The FAB-SAW test with different filling materials and big gap is carried out on two kinds of DH36 ship steel plates with same composition and different thicknesses,and the mechanical properties and microstructure characteristics of welded joints are analyzed. The results show that adopting FAB-SAW as backing welding and SAW for filling and covering, the tensile strength,bending property,hardness value, impact toughness and other properties of welded joints can meet the standard requirements; The weakest impact toughness of the entire joint is at the center of the weld, and the multi-layer and multi-pass welding is adopted for the surface weld center,so the impact value of the surface weld center is higher than that of the welding root. The broken welding wire and iron powder compositions of filling materials are different,but they have little effect on the impact value of root weld center. The base metal is manufactured by TMCP technology and designed with low carbon content,so the coarsening of the microstructure of the heat affected zone is not obvious and the impact toughness is good.
The FAB-SAW test with different filling materials and big gap is carried out on two kinds of DH36 ship steel plates with same composition and different thicknesses,and the mechanical properties and microstructure characteristics of welded joints are analyzed. The results show that adopting FAB-SAW as backing welding and SAW for filling and covering, the tensile strength,bending property,hardness value, impact toughness and other properties of welded joints can meet the standard requirements; The weakest impact toughness of the entire joint is at the center of the weld, and the multi-layer and multi-pass welding is adopted for the surface weld center,so the impact value of the surface weld center is higher than that of the welding root. The broken welding wire and iron powder compositions of filling materials are different,but they have little effect on the impact value of root weld center. The base metal is manufactured by TMCP technology and designed with low carbon content,so the coarsening of the microstructure of the heat affected zone is not obvious and the impact toughness is good.
引文
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[4]李鹏,冯朝闻,王华,等. FAB埋弧自动单面焊焊接技术的应用[J].中国水运,2015,15(3):93-95.
[5]刘磊.合金元素对FAB法埋弧焊EH36钢接头组织与性能的影响[J].江苏科技大学学报,2017,31(6):746-750.
[6]徐雁飞,刘辉,李梦龙,等.堆覆铁粉双丝埋弧衬垫焊工艺研究[J].焊接技术,2016,45(3):50-53.
[7]刘桑,杨伟锋,许斌,等. FGB法单面埋弧自动焊工艺试验及应用[J].广东造船,2015(2):68-70.
[8]材料与焊接规范[S].北京:中国船级社,2018.
[9]孙咸.气保护药芯焊丝熔敷金属组织的选择与控制[J].电焊机,2014,44(6):1-6.
[10]安栋,徐学东,张海.基于X70高级管线钢多道焊缝和单道焊缝组织EBSD研究[J].电子显微学报,2013,32(5):389-395.
[11]及玉梅,付魁军,徐光,等.船板生产工艺对大线能量焊接性能影响的对比及分析[R].成都:2007年中国钢铁年会,2007.
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