双相钢点焊熔核界面撕裂失效模式参数控制

杨海军; 张延松; 来新民; 张小云

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双相钢点焊熔核界面撕裂失效模式参数控制
杨海军¹, 张延松¹, 来新民¹, 张小云²
1.上海交通大学机械与动力工程学院, 上海 200240;2.上海通用汽车有限公司整车制造工程部, 上海 201201

摘要:

采用改进响应面试验分析方法对影响1.4 mm双相钢DP600点焊接头界面撕裂失效模式的工艺参数进行研究.结果表明,焊接电流、焊接时间以及保持压力是影响双相钢焊点界面撕裂失效模式的关键参数,合适的焊接工艺参数有助于提升熔核直径比,并且降低其对焊接参数的敏感度.以焊接工艺的鲁棒性为优化目标,获得了控制焊点界面撕裂失效模式的最优工艺参数.结果表明,采用该最优焊接参数能够有效控制双相钢电阻点焊焊点界面撕裂问题.

关键词: 双相钢界面撕裂改进响应面法工艺优化

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基金项目:国家自然科学基金资助项目(50905111);上海汽车工业科技发展基金资助项目(0907)

Parameters control for interfacial fracture mode of resistance spot weld dual-phase steels

YANG Haijun¹, ZHANG Yansong¹, LAI Xinmin¹, ZHANG Xiaoyun²

1.School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China;2.Vehicle Manufacturing Engineering, Shanghai General Motors, Shanghai 201201, China

Abstract:

In this paper,the response surface method is used to analyze the influence of welding parameters on the interfacial fracture mode of resistance spot welded(RSW) joint made of dual phase steel DP600 with 1.4 mm thickness.The results showed that welding current,welding time and holding pressure were the key parameters to the interfacial fracture mode of the RSW joints.The proper welding parameters can enlarge the weld nugget diameter ratio and reduce its sensitivity to welding parameters.The optimized welding parameters were obtained to control the interfacial fracture mode with the consideration of the robustness of welding process which was validated by experiments.

Key words: dual phase steel interfacial fracture improved response surface method process optimization