| 摘要: |
| 针对差强差厚三层板电阻点焊过程熔核形成规律展开研究,提出采用不对称电极帽匹配方法改善点焊熔核尺寸及可焊性窗口宽度.基于建立的有限元模型,分析了两种电极帽匹配下薄板侧熔核形成过程中的电流密度、温度场及熔核尺寸的变化规律.通过试验对比分析了不同焊接时刻的薄板侧熔核尺寸,并建立了两种电极帽匹配下的差强差厚三层板点焊可焊性工艺窗口.结果表明,该方法能有效解决差强差厚三层板点焊过程中的熔核偏移及薄板侧熔核尺寸偏小的问题,提高电阻点焊过程的鲁棒性. |
| 关键词: 三层板 电阻点焊 熔核尺寸 可焊性工艺窗口 |
| DOI： |
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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) |
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| Control method for nugget size of resistance spot welding of three-layer steels with different thickness and strength |
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SHEN Jie, LIN Haolei, ZHANG Yansong, CHEN Guanlong
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Shanghai Key Laboratory of Digital Autobody Engineering, Shanghai Jiaotong University, Shanghai 200240, China
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| Abstract: |
| In order to study the nugget formation during resistance spot welding procers of three-layer steels with different strength and thickness,asymmetric electrodes were utilized to improve the nugget size and weldability.Finite element analysis was used to investigate the current density,temperature change and nugget sizes of the thinner side.Experiments were also carried out to analyze nuggets sizes at different welding time.The welding lobes under symmetric and asymmetric electrodes were established.The results showed that the current density and temperature field of the thinner side could be changed significantly as asymmetric electrodes were applied,which could facilitate the formation of nugget and widen the weldability of three-layer sheets. |
| Key words: three layers resistance spot welding nugget size welding lobe |
