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DP590高强钢双脉冲胶焊连接工艺研究及数值模拟
易金权1,曾凯1,邢保英1,肖智杰1
昆明理工大学机电工程学院,昆明 650500
摘要:
针对DP590高强钢,设计了一种双脉冲直流点焊波形,开展胶焊工艺试验研究,对比分析单脉冲胶焊与双脉冲胶焊接头的力学性能;建立胶焊仿真模型,分析双脉冲胶焊温度场的演变规律。结果表明:双脉冲电流的引入能有效降低飞溅的产生,提高接头质量的稳定性,其接头的力学性能优于单脉冲胶焊;其次,双脉冲胶焊工艺熔核区存在两次焊核增长过程,热循环曲线呈现“双峰”特征,且热输入量高于单脉冲胶焊;双脉冲胶焊接头焊核直径的模拟值和实际值均大于单脉冲胶焊接头,仿真的焊核直径分别为6.42、5.97 mm,对应的实际焊核直径分别为6.61、5.77 mm。
关键词:  双脉冲胶焊  极差分析  仿真模型  焊核直径
DOI:10.12044/j.issn.1007-2330.2019.04.003
分类号:TG44
基金项目:国家自然科学基金 51565022 国家自然科学基金(51565022)
Investigation and Numerical Simulation on Double-Pulse Weld Bonding Connection Process for DP590 High Strength Steel
YI Jinquan1,ZENG Kai1,XING Baoying1,XIAO Zhijie1
Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500
Abstract:
In this paper, a double-pulse DC spot welding waveform was designed for DP590 high-strength steel, and the weld bonding process test was carried out. The mechanical properties of single-pulse and double-pulse weld bonding joints were compared and analyzed. In order to investigate the evolution of temperature field for double-pulse weld bonding joint, the weld bonding simulation models were established. The results show that the use of double pulse current can effectively reduce the generation of spatter and improve the stability of joints quality, and the mechanical properties of double-pulse weld bonding joints are better than that of single-pulse weld bonding. Furthermore, there are two growth processes in the nugget area of double-pulse weld bonding process. The thermal cycle curve exhibits “double peak” characteristics, and the thermal input of double-pulse weld bonding is higher than that of single-pulse weld bonding. The diameters of the double-pulse weld bonding joint from simulation and test are larger than that of the single-pulse weld bonding joint, and the nugget diameter of simulation is 6.42 mm and 5.97 mm, and the actual welding nugget diameter is 6.61 mm and 5.77 mm.
Key words:  Double-pulse weld bonding  Range analysis  Simulation model  Nugget diameter