Research on fatigue property of the welded joints of Q345E steel plate for express freight car bogie

WEI Shitong; JIANG Haichang; LU Shanping

doi:10.7512/j.issn.1001-2303.2020.01.20

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Research on fatigue property of the welded joints of Q345E steel plate for express freight car bogie
Vol. 50, Issue 1, Pages: 105-108(2020)
Published：2020
DOI： 10.7512/j.issn.1001-2303.2020.01.20
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DOI：

WEI Shitong, JIANG Haichang, LU Shanping. Research on fatigue property of the welded joints of Q345E steel plate for express freight car bogie[J]. Eletric Welding Machine2020, 50(1): 105-108. DOI： 10.7512/j.issn.1001-2303.2020.01.20.

摘要

采用熔化极非惰性气体保护电弧焊(MAG)工艺对快捷货车转向架用Q345E钢板进行焊接试验

经无损检测合格后对焊接接头进行疲劳性能试验

制定了焊接接头的疲劳S-N曲线

并采用升降法确定了接头的疲劳极限及标准偏差

通过对疲劳试样断口进行系统分析

确定了接头的疲劳失效机制

结果表明:接头焊缝内的微小气孔和夹渣缺欠对接头的疲劳性能有明显影响

该缺欠在接头疲劳试验过程中将成为疲劳裂纹的萌生位置

进而恶化接头的疲劳性能。

Abstract

Q345E steel plates for express freight car bogie were welded by metal active gas arc welding（MAG） welding method. After post weld nondestructive testing

the fatigue performance tests of the qualified welded joints were carried out. According to the test results

the fatigue S-N curve of the welded joint was drawn up

the fatigue limit and standard deviation of the welded joint were determined by lifting method. The fatigue failure mechanism of the welded joints was determined by fracture surface analysis of fatigue specimens.The results show that the porosity and slag defects in the weld have significant impacts on the fatigue properties of the welded joints

which will become the initial positions of fatigue cracks and deteriorate the fatigue properties of the welded joints.