摘要
运用正交试验设计法,以接头拉剪载荷为评价指标,对工业试制冷轧DP600双相钢进行点焊工艺优化,采用极差法和方差法对结果进行分析,获得了点焊工艺窗口及最优焊接工艺,并对最优焊接工艺下的点焊接头性能及显微组织进行测试和分析.结果表明,冷轧DP600双相钢的焊接工艺窗口为焊接电流9 00012 000 A,焊接时间200-500 ms.焊接电流对点焊接头拉剪载荷的影响最显著,随着焊接电流增加,接头拉剪载荷逐渐增大.当焊接电流为12 000 A,焊接时间为200 ms,电极力为2 500 N时,获得的最大拉剪载荷为14 kN,最大冲击吸收功为45.26 kJ,点焊熔核组织主要由板条马氏体组成.
The spot welding parameters for cold-rolled dual-phase DP600 steel in industrial trial production were optimized by orthogonal experimental design method with the tensile/shear loads of spot welded joints as the evaluation index.The welding window and optimal welding parameters were achieved by range analysis and variance analysis.The microstructure and tensile/shear loads of the spot welded joints under optimized welding parameters were investigated.The results showed that the welding current was between 9 000 A and 12 000 A,and the welding time was between 200 ms and 500 ms in the welding window.The welding current had most remarkable influence on the joint strength.With the increase of welding current,the tensile/shear loads increased.The maximum load 14 kN and the maximum absorbing energy 45.26 kJ were obtained with 12 000 A welding current,200 ms welding time and 2 500 N electrode pressure.And the microstructure of the resultant welded nugget mainly consisted of lath martensite.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2013年第6期81-84,117,共4页
Transactions of The China Welding Institution
基金
北京工业大学研究生科技基金资助项目(YKJ-2011-6442)
