激光填丝焊碳钢车体不等厚对接接头疲劳性能

李洋; 郭丽娟; 刘东军; 田慧; 刘华伟

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激光填丝焊碳钢车体不等厚对接接头疲劳性能
Fatigue properties of different thickness butt joints of carbon steel body with laser fillet welding
2018年48卷第5期页码：31-33
纸质出版：2018
DOI：
稿件说明：

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李洋, 郭丽娟, 刘东军, 等. 激光填丝焊碳钢车体不等厚对接接头疲劳性能[J]. 电焊机, 2018,48(5):31-33. DOI：

LI Yang, GUO Lijuan, LIU Dongjun, et al. Fatigue properties of different thickness butt joints of carbon steel body with laser fillet welding[J]. Eletric Welding Machine2018, 48(5): 31-33. DOI：

摘要

使用2.5 mm+4 mm的碳钢材料和ER50-G焊丝进行不等厚对接接头的激光填丝焊试验

研究不等厚对接接头的疲劳性能和断口的宏观及微观形貌

并分析其断口特征。结果表明

在指定寿命为1×10

次循环时

接头的中值疲劳极限σ

0.1

为237.5 MPa。疲劳断裂发生在2.5 mm板一侧的焊趾处

断裂呈现典型的疲劳断裂特征

疲劳纹清晰

瞬断区断口形貌为大小不一的韧窝。该研究为激光填丝焊在碳钢车体制造上的应用提供了可靠的技术支撑。

Abstract

Using 2.5 mm+4 mm carbon steel material and ER50-G welding wire to conduct laser filling wire welding test of unequal thickness butt joint. The fatigue properties and macroscopic and microscopic appearance of the unequal thickness butt joints are studied

and the fracture characteristics are analyzed. The results show that the fatigue value of the join is 237.7 MPa when the specified life cycle is 1×10

. The fatigue fracture occurs at the welding toe on the side of the 2.5 mm plate. The fracture presents typical fatigue characteristics

and the fatigue lines are clear

and the fracture morphology of the transient area is a dimple of different sizes. This study provides a reliable technical support for laser fillet welding in the manufacture of carbon steel body.