摘要
沪通长江大桥横港沙浅水区7孔112m简支钢桁梁箱形杆件采用的Q370qE和Q420qE钢焊接性较好,主要焊缝类型为棱角焊缝和T形接头坡口角焊缝。采用双丝埋弧焊焊接工艺焊接棱角焊缝,双丝电源类型为直流电源+交流电源组合,双丝间距30cm。为研究该焊接工艺的可行性,进行焊接工艺评定试验,制作Q370qE和Q420qE两种不同材质的棱角坡口形式焊接试件,在焊接过程中发现问题并及时调整预定的焊接工艺参数,焊后对试件进行焊缝缺陷、拉伸、冲击、硬度和宏观金相等检测并进行分析。结果表明:焊缝无损检测、力学性能检测、硬度检测及宏观金相检查等试验的检验结果均符合标准要求,验证了所制定的双丝埋弧焊焊接工艺的可行性。实践证明,双丝埋弧焊焊接工艺的运用缩短了箱形杆件的制作工期,提高了箱形杆件的焊缝质量。
The box members of the seven spans of 112 m long simply-supported steel truss girders in Henggang Istet shallow water area of Hutong Changjiang River Bridge are made of Q370qE and 420qE steel,due to the good welding performance of the two types of steel.The fillet welds and T-groove welds are the predominant welds.The fillet welds were made by the twin-wire submerged arc welding.The two wires,with a distance of 30 cm,were charged with the direct current and alternating current.To study the feasibility of the welding technique,the welding technique evaluation testing was done.The welding samples with fillet and T-groove welds made of Q370qE and Q420qE steel respectively were prepared.The welding parameters were timely adjusted according to the problems found in the welding process.After the welding,the welding defects were inspected and tensioning capacity,impacting resistance,hardness and the macro-metallographic structure of the welds were examined.The results show that the findings of the non-destructive test,mechanical performance test,hardness inspection and macro-metallographic examination all meet the related requirements,which verifies the feasibility of the twin-wire submerged arc welding technique.The engineering practice proves that the application of twin-wire submerged arc welding technique can shorten the fabrication time of the box members and improve the quality of the welds in the box members.
作者
倪金荣
谷林
孙晓龙
NI Jin-rong;GU Lin;SUN Xiao-long(Jiangsu Zhongtai Bridge Steel Structure Co.,Ltd.,Jingjiang 214521,China)
出处
《世界桥梁》
北大核心
2018年第1期56-60,共5页
World Bridges
关键词
公路铁路两用桥
钢桁梁
箱形杆件
双丝埋弧焊
焊接工艺参数
焊接性能
试验
评定
rail-cum-road bridge
steel truss girder
box member
twin-wire submerged arc welding
welding parameters
welding performance
testing
evaluation
