Investigation on the Failure Mechanism of DP590-22MnB5 (Quenched) and DP590-DP590 Spot-Welding Joints

被引：2

作者：

XIN Li-jiu 1

2.SAIC Motor Corporation Limited

机构：

来源：

Journal of Iron and Steel Research(International) | 2011年 / 18卷 / S1期

关键词：

spot welding; 22MnB5; DP590; failure mechanism;

D O I：

10.13228/j.boyuan.issn1006-706x.2011.s1.165

中图分类号：

TG457.1 [金属材料的焊接];

学科分类号：

080201 ; 080503 ;

摘要：

The failure mechanism of DP590-22MnB5(quenched) and DP590-DP590 spot-welding joints is studied through lap-shearing experiments,metallographic observation and three-dimensional finite element simulation.Both joints cracked on the DP590 steel,but the tensile shear strength of the DP590-22MnB5(quenched) joint is greater than that of the DP590-DP590 joint.A finite element model for the lap-shearing experiment is established according to the mechanical properties of DP590 and 22MnB5(quenched) steels and the metallographic analysis of welding spots.The simulation results show that the difference in the axis rotation of the two welding spots causes different distributions of stress and strain,which shifts shear loading condition to opening loading condition.Due to larger axis rotation angle of the DP590-DP590 joint,the stress concentration occurs at the middle of the nugget circumference,and it results in lower tensile shear strength of the DP590-DP590 joint.

引用

页码：936 / 940

页数：5

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