Hot Stamping High Strength Steel Spot Welding Technology and Quality Evaluation of Welding Joint

摘要：

　　The heterogeneity of microstructure and mechanical performance of welding joints were affected by unique material properties such as high resistivity and low thermal conductivity,instantaneous high temperature of spot welding thermal cycle, and uneven local cooling rate.Because of ultra high strength of hot stamping parts, the welding joint is more inclined to fail as the failure mode of interfacial fracture, the traditional critical nugget formula 4√t fell down.Through designing orthogonal experiment, the effect of different welding parameters on joint performance was analyzed, the optimized welding process was obtained; on account of the quality evaluation of welding joint, nugget spherical mode was built to separately analyze the stress condition of welding joint in the failure modes of interfacial fracture and nugget pull-out, the new evaluation criterion aimed at high strength steel was established.Two kinds of 1.2 mm and 2.0 mm steels were used to validate the critical weld diameter.Results showed that the critical formula could accurately evaluate failure of the weld joints.

关键词： Hot stamping high strength steel spot welding quality evaluation

作者: Sufeng Hao Zhongde Shan Shujun Chert Chao-Jiang

作者单位: State Key Laboratory of Advanced Forming Technology and Equipment,Beijing 100083,China China Academy of Machinery Science and Technology,Beijing,100044,China Beijing University of Technology,Beijing 100124,China

会议类型: 国际会议

会议名称: 2014 International Conference on Hot Stamping of UHSS(2014高强度钢热冲压成形国际会议)

会议地点: 重庆

会议语种:英文

页码: 188-192

在线出版日期: 2014-08-21（万方平台首次上网日期，不代表论文的发表时间）