Comparative study of small scale and 'large scale' resistance spot welding
Comparative study of small scale and 'large scale' resistance spot welding
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DOI：
10.1179/136217101101538875
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发表时间：
2001-01-01
影响因子：
3.3
通讯作者：
Zhou, Y
中科院分区：
文献类型：
--
作者：
Chang, BH;Li, MV;Zhou, Y
采用有限单元法建立了一个电-热-力增量耦合模型，用于模拟小尺寸电阻点焊过程。该数值模型，然后研究SSRSW和“大规模”电阻点焊（LSRSW）之间的差异。在工件/工件界面的接触面积，电流分布和温度分布的变化进行了比较。计算表明，电极力的差异可能是SSRSW和LSRSW其他差异的根本原因。与LSRSW相比，SSRSW中施加的低得多的电极力（压力）导致相对小的接触面积，因此其高得多的电流密度，这又导致工件/工件界面处的更大的加热速率和更高的温度。这种小的接触面积也导致SSRSW中相对小的熔核直径，其仅为电极尖端直径的约30%。相反，LSRSW中的熔核直径与电极尖端直径相当。预测的熔核直径在SSRSW和LSRSW的低碳钢板与实验结果进行比较。
An incrementally coupled electrical-thermal-mechanical model is developed to simulate small scale resistance spot welding (SSRSW) using the finite clement method. This numerical model is then employed to study the differences between SSRSW and 'large scale' resistance spot welding (LSRSW). The variations in contact area, current distribution, and temperature profile at the workpiece/workpiece interfaces the compared. The computation shows that the difference in electrode force could he the essential reason for other differences between SSRSW and LSRSW. Compared with LSRSW, a much lower electrode force (pressure) applied in SSRSW results in a relatively small contact area and hence it much higher current density, which in turn leads to a greater heating rate and higher temperature at the workpiece/workpiece interface. This, small contact area also results in it relatively small nugget diameter in SSRSW, which is only about 30% of the electrode tip diameter. In contrast, the nugget diameter in LSRSW is comparable to the electrode tip diameter. The predicted nugget diameters in both SSRSW and LSRSW of mild steel sheets compare well with experimental results.