Effect of multiple weld repairs on fatigue strength of bogie frame of railroad vehicle

Advances in Mechanical Engineering Pub Date : 2023-11-01 DOI:10.1177/16878132231213596

J. Seo, Hyun-Moo Hur, S. Kwon, Kyung-Ho Moon

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Abstract

In the welded structure of railroad vehicles, the bogie frame requires a service life more than 25 years, cracks occur in the weld zone owing to the application of repetitive fatigue loading during operation. When cracks occur and propagate in the weld zone, they are removed through gouging, and gas metal arc welding is performed for repair. After the first weld repair, the second weld repair process is performed if crack is visible in the same area. In this study, the effects of repetitive repair welding on the fatigue characteristics were investigated using materials applied in railway vehicle structures. Three types of specimens (weld specimen, first weld repairs specimen, and second weld repairs specimen) were prepared, and fatigue and residual stress tests were performed. The results indicated that the weld specimen had the longest fatigue life, and the first weld repairs specimen had the shortest fatigue life. The fatigue life of the second weld repairs specimen was longer than that of the first weld repairs specimen. Residual stress tests and finite-element analysis results indicated that the first weld repairs specimen had the shortest fatigue life among the specimens tested, because the highest residual stress was generated.

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多重焊缝修补对轨道车辆转向架框架疲劳强度的影响

在铁路车辆的焊接结构中，转向架构架的使用寿命要求超过 25 年，由于在运行过程中承受重复疲劳载荷，焊接区会出现裂纹。当裂纹在焊接区出现并扩展时，会通过刨削去除裂纹，然后进行气体金属弧焊修复。第一次焊接修复后，如果同一区域出现裂纹，则进行第二次焊接修复。本研究使用铁路车辆结构中的材料，研究了重复修补焊接对疲劳特性的影响。研究人员制备了三种试样（焊接试样、第一次焊接修复试样和第二次焊接修复试样），并进行了疲劳和残余应力测试。结果表明，焊接试样的疲劳寿命最长，第一次焊接修复试样的疲劳寿命最短。第二次焊接修复试样的疲劳寿命长于第一次焊接修复试样。残余应力测试和有限元分析结果表明，在测试的试样中，第一个焊缝修复试样的疲劳寿命最短，因为产生的残余应力最大。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Advances in Mechanical Engineering

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