基于二维DIC技术的电阻点焊板件变形分析

结合二维数字图像相关技术(DIC),针对焊接电流、通电时间及电极力对电阻点焊过程中工件翘曲变形量的影响规律进行了深入研究和讨论. 结果表明,利用二维DIC技术获得的工件变形过程与电阻点焊各个阶段相吻合,而且具有较高的精确度. 随着焊接电流和通电时间的增大,熔核形成造成的翘曲变形增大;随着电极力的增大,熔核形成造成的翘曲变形减小,同时电极下压造成的变形增大.二维数字图像相关技术在电阻点焊过程中的首次尝试为电阻点焊工艺的研究和焊接质量的提高提供了新的方法,对电阻点焊工艺的发展和完善具有重要意义.

Study on welding deformation of resistance spot welding using two-dimensional DIC technique

The effect of welding current, welding time and electrode force on warping deformation of lap joint during resistance spot welding were investigated by using two-dimensional digital image correlation technique. The results show that the deformation changes differently at different phases of resistance spot welding process. Under identical conditions, increasing with the of the welding current or welding time, the warping deformation induced with nugget formation increased. With the electrode force increasing while the other conditions were identical, the warping deformation induced by nugget formation reduced while that induced by electrode impact increased. The two-dimensional digital image correlation technique was used for the first time researching the resistant spot welding process and it will provide HJ1.15mm]new approach for the resistance spot welding process research and the weld quality improvement, which is of great significance for the development and improvement of the resistance spot welding process.