高铁简支箱梁钢筋骨架电阻焊接工艺参数研究  

Research on Resistance Welding Process Parameters of Steel Skeleton in High-speed Railway Simply Supported Box Girders

作　　者：牛远志 郑贺民 张少朋 张上 郭鑫飞 NIU Yuanzhi;ZHENG Hemin;ZHANG Shaopeng;ZHANG Shang;GUO Xinfei(China Railway Design Corporation,Tianjin 300142,China;Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]中国铁路设计集团有限公司,天津300142 [2]河北工业大学,天津300401

出　　处：《铁道工程学报》2024年第10期39-43,共5页Journal of Railway Engineering Society

基　　金：国家铁路集团有限公司科技开发重大课题(K2023G004);天津市制造业高质量发展专项课题(23ZGCXQY00030);中国铁路设计集团有限公司科技开发课题(2024A0203601)。

摘　　要：研究目的:目前高铁简支箱梁的钢筋骨架制造主要依赖人工绑扎,效率低、成本高。为此,本文作者团队提出了简支箱梁钢筋骨架自动电阻焊接工艺,能够替代传统绑扎方法、提升制造效率、降低人力成本。但该焊接工艺会对钢筋造成一定损伤,在车辆荷载的反复作用下可能会导致产生焊接点疲劳问题。本文通过试验探究焊接工艺下不同焊接参数对钢筋骨架中十字焊接钢筋的静力拉伸性能和疲劳性能的影响,确定最优的焊接参数以保证钢筋骨架的性能。研究结论:(1)电阻焊接工艺制成的钢筋试件在静力拉伸试验和疲劳试验中破坏模式不同,前者以焊点处横向短钢筋脱离长钢筋的形式破坏,后者表现为纵向长钢筋在焊点处断裂;(2)焊接参数与试件的静力拉伸强度和疲劳寿命之间不是简单的线性关系,存在局部极值点;(3)综合考虑静力拉伸强度与疲劳寿命,N3组焊接参数表现最佳,其对应的电流有效值为11.5 kA,电流峰值为16.0 kA,电压为0.6 V,焊接时间为9个周波;(4)本研究成果可应用于高铁钢筋骨架的电阻点焊制造,推动简支箱梁的高效生产与发展。Research purposes:Currently,the fabrication of steel skeletons for simply supported box girders in highspeed railway construction primarily relies on manual tying,which is inefficient and costly.To address this issue,the authors of this paper proposed an automated resistance welding process for steel skeletons for simply supported box girders,which can replace traditional tying methods to enhance manufacturing efficiency and reduce labor costs.However,this welding process can cause some damage to the steel bars,potentially leading to fatigue issues at the weld points under repeated vehicle loads.The purpose of this study is to experimentally investigate the effects of different welding parameters on the static tensile strength and fatigue performance of cross-welded steel bars in the steel skeleton,to determine the optimal welding parameters to ensure the performance of the steel skeleton.Research conclusions:(1)The failure modes of the steel specimens produced by resistance welding differ between static tensile tests and fatigue tests.In the former,failure occurs as the transverse short steel bar detaches from the long steel bar at the weld point,while in the latter,it manifests as the longitudinal long steel bar breaking at the weld point.(2)The relationship between the welding parameters and the static tensile strength and fatigue life of the specimens is not a simple linear one,with the presence of local extremum points.(3)Considering both static tensile strength and fatigue life,the N3 welding parameter set demonstrates the best performance.The corresponding effective current value is 11.5 kA,the peak current is 16 kA,the voltage is 0.6 V,and the welding time is 9 cycles.(4)The findings of this study can be applied to the resistance spot welding of steel skeletons in high-speed railway construction,promoting the efficient production and development of simply supported box girders.

关 键 词：高铁 简支箱梁 钢筋骨架 试验研究 工艺参数 疲劳试验 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]