摘要
对TRIP780高强钢进行一系列电阻点焊试验,对点焊部位进行金相分析、显微硬度分析、抗剪切试验和十字拉伸试验等分析手段。研究焊前预热、焊后回火、焊接时间等工艺因素对TRIP钢点焊焊点的优化效力。焊前预热工艺对焊点的组织和力学性能的影响较小,在合理范围内延长焊接时间能有效地提高焊点的抗剪切性能,焊后回火工艺能有效地改善焊点的组织结构和力学性能。确定其最佳点焊工艺参数为焊接电流6 000 A、焊接时间17 cyc、电极压力5.0 kN、回火电流3 500 A、回火时间20 cyc。
A series of resistance spot welding teachnology for TRIP780 high strength steel were researched.To find which parameters, such as welding preheating,postweld tempering and welding time,play an important role to resistance spot welding,metallographic analysis,microhardness,shear tests and cross tensile test were used in the study of the spot welding.The research and analysis conclusion as follows：welding preheating had little influence on the organization and the mechanics properties,welding time which in the reasonable scope could effectively improve the shear performance,postweld tempering could effectively improve the organizational structure and mechanics performance.It had determine the optimal parameters of the welding process, such as welding current was 6 000 A, welding time was 17 cyc ,electrode＇s pressure was 5.0 kN ,tempering current was 3 500 A and tempering time was 20 cyc.
出处
《电焊机》
北大核心
2011年第10期73-76,共4页
Electric Welding Machine
关键词
TRIP780
电阻点焊
点焊工艺
焊后回火
TRIP780
resistance spot welding
resistance spot welding technology
postweld tempering
