Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第20卷    第z1期    总第1期    2010年10月

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文章编号:1004-0609(2010)S1-s0173-05
不同搭接间隙的电子束焊搭接接头的疲劳性能
吴  冰1, 2,巩水利2,唐振云2

(1. 西安交通大学 材料科学与工程学院,西安 710049;
2. 北京航空制造工程研究所高能束流加工技术国家级重点实验室,北京 100024
)

摘 要: 对不同搭接间隙的电子束焊搭接接头的疲劳性能进行分析,确定搭接间隙对试样疲劳S—N曲线的影响。结果表明:不同搭接间隙电子束焊搭接接头的疲劳裂纹均启始于间隙尖端,沿焊缝表面板热影响区扩展,最终导致搭接焊接头疲劳破坏,即疲劳断裂主要是搭接间隙尖端的应力集中所引起的;搭接焊间隙对电子束搭接焊接头疲劳性能有较大影响,间隙增大应力集中增加,因而其疲劳性能降低。

 

关键字: 搭接接头;搭接间隙;电子束焊接;疲劳性能

Fatigue properties of electron beam welding overlap joints with
 different overlap gaps
WU Bing1, 2, GONG Shui-li1, TANG Zhen-yun1

1. School of Material Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
2. National Key Laboratory For Science and Technology on Power Beam Processes,
Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China

Abstract:The fatigue properties of electron beam welding overlap joints with different overlap gap were analyzed, and the effect of the overlap gap on the S—N fatigue curves of samples were studied. The results show that all of the fatigue cracks of electron beam welding overlap joints initiate at the gap near the weld surface, and extends along the heat affected zone (HAZ), eventually leading to fatigue failure. In other words, the fatigue cracks are caused by the stress concentration of the overlap gap near the weld surface. Thus, the overlap gap is one of the significant impacts on the fatigue properties of electron beam welding overlap joints, and when the overlap gap increases, the stress concentration increases, the fatigue properties decreases.

 

Key words: overlap joints; overlap gap; electron beam welding; fatigue properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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