Investigation on the Failure Mechanism of DP590-22MnB5(quenched) and DP590-DP590 Spot-welding Joints
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.
spot welding 22MnB5 DP590 failure mechanism
XIN Li-jiu MIN Jun-ying LIN Jian-ping FENG Qi
College of Mechanical Engineering, Tongji University, Shanghai 201804, China SAIC Motor Corporation Limited,Shanghai 201804, China
国际会议
The 6th International Conference on High Strength Low Alloy Steels(第六届高强度低合金钢国际会议HSLA Steels2011)
北京
英文
719-722
2011-05-31（万方平台首次上网日期，不代表论文的发表时间）