Modeling of resistance spot welding of multiple stacks of steel sheets
Modeling of resistance spot welding of multiple stacks of steel sheets
复制标题
多叠钢板电阻点焊建模
DOI：
10.1016/j.matdes.2010.08.023
复制
发表时间：
2011-02-01
影响因子：
8.4
通讯作者：
Wang, P. C.
中科院分区：
文献类型：
--
作者：
Shen, Jie;Zhang, Yansong;Wang, P. C.
焊接质量是多层钢板电阻点焊的一大挑战。由于钢板力学性能和物理性能的差异以及钢板厚度的变化，钢板之间的接触状态和焊接电流在堆叠接头中的流动是复杂的。因此，延迟界面处的焊缝尺寸不一致成为一个问题。为合理预测0.6 mm厚镀锌SAE1004+1.8 mm厚镀锌SAE1004+1.4 mm厚镀锌双相(DP600)钢板堆电阻点焊熔核形成过程，建立了热-力/热-电耦合增量模型。结果表明，DP600焊接面上的焊核形成时间早于另一面，这与实验结果吻合较好。在耦合模型的基础上，分析了板材厚度组合和钢种组合的影响。结果表明，对于多组SAE1004+SAE1004+DP600钢板，其临界上下板厚比约为1：3。该模型可为满足钢构件焊接质量要求的焊接工艺参数、板厚和钢种的选择提供重要的指导。(C)2010爱思唯尔有限公司。保留所有权利。
Weld quality is a major challenge for resistance spot welding of multiple stacks of steel sheets. Because of the differences in mechanical and physical properties of steel sheets and the sheet gage variation, the contact state between sheets and welding current flow throughout the stack joint is complicated. As a result, discrepant weld sizes at the faying interfaces become an issue. In this study, a coupled thermal-mechanical/thermal-electrical incremental model has been developed to reasonably predict the weld nugget formation process of resistance spot welding of a sheet stack made of 0.6 mm thick galvanized SAE1004+1.8 mm thick galvanized SAE1004+1.4 mm thick galvanized dual-phase (DP600) steel using published thermal, electrical, and mechanical properties. It was found that the weld nugget on the faying interface of DP600 forms earlier than that on the other interface, which agrees well with the experimental results. Based on the coupled model, the effects of the sheet gage combination and steel grade combination were examined. The results show that, for a multiple stacks of steel sheets SAE1004 + SAE1004 + DP600, the critical ratio of sheet thickness between the top and bottom sheets is approximately 1:3. The model could provide an important guidance in the selection of the welding variables, sheet gage and steel grade to meet the weld quality of steel component. (C) 2010 Elsevier Ltd. All rights reserved.