Friction Spot Joining of High Strength Steel Sheets for Automotives

被引：0
|
作者：
Ryoji Ohashi
Mitsuo Fujimoto
Sergey Mironov
Yutaka S. Sato
Hiroyuki Kokawa
机构：
[1] Kawasaki Heavy Industries,Manufacturing Technology Department, System Technology Development Center
[2] Ltd.,Department of Materials Processing, Graduate School of Engineering
[3] Tohoku University,undefined
来源：
Welding in the World | 2009年 / 53卷
关键词：
Automobile engineering; Friction welding; Hardness; Lap joints; Microstructure; Strength; Mechanical properties;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
In this study, friction spot joining (FSJ) was applied to dual-phase steel DP980 using a newly-developed silicon nitride (Si3N4) tool with a threaded pin, after which microstructure and strength of the joint were examined. The cross-sectional microstructure was distinctly classified into four zones which experienced the different heat cycles and deformation histories during FSJ. Electron probe micro analyzer revealed that silicon, oxygen and nitrogen were involved in the alternate band patterns observed in the stir zone, which could be attributed to contamination from the tool. The contamination was prevented by coating of the tool surface and the use of Ar shielding. The mechanical tests showed that the contamination reduced the joint strength, especially the cross tensile strength.
引用
收藏
页码：23 / 27
页数：4
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