HRB400钢筋电阻对焊接头焊接参数对其性能的影响及优化  

Influence and Optimization of HRB 400 Steel Upset Butt Welding Parameters on the Properties of Welded Joints

作　　者：陈士忠 苏伟 刘子金 侯爱山 CHEN Shizhong;SU Wei;LIU Zijin;HOU Aishan(School of Mechanical Engineering,Shenyang Jianzhu University,Shenyang,China,110168;Institute of Building Mechanization,China Academy of Building Research,Langfang,China,065000)

机构地区：[1]沈阳建筑大学机械工程学院,辽宁沈阳110168 [2]中国建筑科学研究院有限公司建筑机械化研究分院,河北廊坊065000

出　　处：《沈阳建筑大学学报（自然科学版）》2021年第2期362-369,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：“十三五”国家重点研发计划项目(2017YFC0704002)。

摘　　要：目的探讨焊接工艺参数对焊接接头力学性能和金相组织的影响,以优化HRB400钢筋电阻对焊的工艺参数。方法对直径10 mm的钢筋开展不同焊接工艺参数下形成的电阻对焊接头性能试验分析,并对各参数下焊接接头熔合区和过热区的金相组织进行对比分析。结果优选出了最佳焊接参数:焊接时间0.8~0.9 s、焊接相对电流65%~68%、顶锻压力0.2~0.3 MPa;随着焊接相对电流的增加,晶粒尺寸逐渐增大,铁素体逐渐增多,魏氏组织含量呈上升趋势;顶锻压力的变化对焊接接头显微组织类别基本没有影响,但熔合区内魏氏组织和铁素体含量有所减少,组织逐渐细化,过热区组织有细化的趋势;随着焊接时间的增加,晶粒尺寸增大且逐渐不均匀,使得接头韧性下降。结论综合考虑各焊接工艺参数对接头组织及性能的影响,建议选用的焊接相对电流为65%和66%两种、顶锻压力为0.3 MPa、焊接时间为0.8 s。In order to optimize the process parameters of HRB400 steel upset butt welding,and discuss the influence of the welding process parameters on the mechanical properties and microstructure of welded joints.The performance test analysis of upset butt welding joints formed by different welding process parameters was carried out for steel bars with a diameter of 10mm,and the metallographic structure of the welding joint in the fusion zone and the superheated zone under various parameters was compared and analyzed.the optimal welding parameters were selected as 0.8~0.9 s welding time,65%~68%welding relative current,and 0.2~0.3 mpa forging pressure.With the increase of welding relative current,the grain size increases gradually,ferrite increases gradually,and the widmanstatten structure content increases.The change of the forging pressure has no effect on the microstructure of the welded joint,but the content of widmanstatten structure and ferrite in the fusion zone decreases,and the microstructure is gradually refined,and the microstructure in the superheated zone tended to be refined.With the increase of welding time,the grain size increases and becomes uneven,which leads to the decrease of joint toughness.Considering the influence of welding process parameters on the joint structure and performance,it is suggested that the welding relative current should be 65%or 66%,the forging pressure should be 0.3 MPa and the welding time should be 0.8 s.

关 键 词：封闭箍筋 电阻对焊接头 焊接参数 性能试验 金相组织 

分 类 号：TU69[建筑科学—建筑技术科学] TG453.9[金属学及工艺—焊接]