摘要
某焊轨基地对60 kg/m-U75V钢轨固定闪光焊接接头进行超声探伤,发现在焊缝轨底角部位存在探伤超标报警的情况。通过金相观察、扫描电镜及能谱仪(EDS)检测,对伤损接头进行分析。结果表明,在钢轨探伤标记位置,焊接接头轨底熔合线处观察到焊接未熔合以及孔洞缺陷,并且在弯曲断口处存在灰斑及异常大块夹杂物。分析认为,探伤报警的主要原因是焊接工艺参数制定不当产生的未熔合、孔洞缺陷以及母材存在超标夹杂物,可通过优化焊接工艺、提高母材冶金质量来减少此类缺陷的产生。
The ultrasonic flaw detection of fixed flash welding joints for 60 kg/m-U75V rail is carried out in a welded rail base.It is found that there is excessive alarm of flaw detection at the rail bottom corner at welding line.The joints with defects are analyzed through metallographic observation,detections with scanning electron microscope and energy dispersive spectrometer(EDS).The results showed that the lack of fusion and hole defect were observed at weld bond at rail bottom of welded joint at the position marked by rail detecting as well as there were gray spots and abnormal bulk inclusions at fracture of bending.Analysis suggested that the main causes of flaw detection alarm were the lack of fusion and hole defects caused by formulating improper welding process parameters as well as excessive inclusions in base material.The defects could be reduced by optimizing welding process and improving metallurgical quality of base material.
作者
文浩然
张凤明
梁正伟
薛虎东
周可
李涛
张鑫
Wen Haoran;Zhang Fengming;Liang Zhengwei;Xue Hudong;Zhou Ke;Li Tao;Zhang Xin(Technical Center of Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia Autonomous Region,China;Jining Track Maintenance Division of China Railway Hohhot Group Co.,Ltd.,Ulanqab 012000,Inner Mongolia Autonomous Region,China)
出处
《包钢科技》
2025年第4期19-24,36,共7页
Science & Technology of Baotou Steel
关键词
钢轨闪光焊接
探伤
焊接缺陷
flash welding of rail
flaw detection
welding defect
