Research on Fatigue Properties of Weathering Steel T-shaped Fillet Joints with Different Shapes

HUANG Xianfeng; HAN Jingru; HUANG Junhui; HUANG Fenglong; BAO Xingwei

doi:10.7512/j.issn.1001-2303.2024.01.18

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Research on Fatigue Properties of Weathering Steel T-shaped Fillet Joints with Different Shapes
Vol. 54, Issue 1, Pages: 114-119(2024)
Received：17 February 2023，

Revised：2023-04-03，

Published：25 January 2024
DOI： 10.7512/j.issn.1001-2303.2024.01.18
稿件说明：

移动端阅览

黄显峰，韩景茹，黄君辉，等.不同形状的耐候钢T形角接接头疲劳性能研究［J］.电焊机，2024，54（1）：114-119. DOI： 10.7512/j.issn.1001-2303.2024.01.18.

HUANG Xianfeng, HAN Jingru, HUANG Junhui, et al.Research on Fatigue Properties of Weathering Steel T-shaped Fillet Joints with Different Shapes[J].Electric Welding Machine, 2024, 54(1): 114-119. DOI： 10.7512/j.issn.1001-2303.2024.01.18.

摘要

T形角接接头在铁路货车箱型结构中应用较为广泛，该接头处受力较为复杂，其疲劳性能对于整车安全有着关键作用。对不同形状Q450NQR1高强度耐候钢多层多道焊T形角接接头进行三点弯曲疲劳试验和疲劳断口扫描试验。结果表明：a10角焊缝、向外凸焊缝与向内凹焊缝焊接接头的中值疲劳极限由高到低依次为289 MPa、277.5 MPa、241 MPa。疲劳试件分别在焊趾或焊缝之间启裂，焊趾处裂纹向母材延伸。观察其断口形貌可知：各区域具有典型疲劳断裂特征，启裂区存在同扩展方向一致的清晰细密的条纹，此种条纹是一种呈向外放射状且具有一定高度差的撕裂棱。扩展区随疲劳循环次数的增加而扩大，裂纹呈河流状分布，终断区观察到大小深浅不一的韧窝，故判断断口为韧窝型韧性断裂。

Abstract

As a common welded joint

T-shaped corner joint is widely used in railway freight box structure. The force of the joint is complicated

and the fatigue performance of the joint plays a key role in the safety of the vehicle when the truck is running. Three point bending fatigue tests and fatigue fracture scanning tests have been carried out on T - shaped Angle joint of Q450NQR1 high strength weathering steel with different shapes. The test results show that the median fatigue limits of a10 fillet weld

outward convex weld and inward concave weld are 289MPa

277.5MPa and 241MPa from high to low. The fatigue specimens were cracked between the weld toe or weld respectively

and the crack at the weld toe extended to the base metal. By observing the fracture morphology

it can be seen that each region has typical fatigue fracture characteristics

and there are clear and fine stripes in the fracture initiation zone in the same direction as the expansion. This stripe is a kind of outward-radiating tearing edge with a certain height difference. The expansion zone expanded with the increase of fatigue cycles

the cracks were distributed like rivers

and dimples of different sizes and depths were observed in the final fault zone

so it was judged that the fracture was dimple-type ductile fracture.

关键词

Keywords

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