In previous works, it has been found out that the electrode displacement in resistance spot welding has a high potential to be used as a measurement factor to monitor joint quality and to subsequently optimize the welding parameters. By extracting characteristic points in the displacement curve, it is possible to create and evaluate different parameter sets and to predict the formation of expulsion. These characteristic points include for example the maximum displacement of the electrodes, the time of the maximum displacement, the indentation displacement in the weld and hold time, or the velocity of the electrodes. In previous work, it was already shown that the indentation displacement showed satisfying results in predicting the nugget diameter for a press hardened 22MnB5 + AS150 under laboratory conditions. Based on that, a newly derived methodology for using the electrode displacement in monitoring a resistance spot weld process is shown for a galvanized dual-phase steel CR440Y780T-DP GI50/50-U. This methodology combines the knowledge of previous research and is split into three steps: the detection of manufacturing discontinuities, the evaluation of expulsion, and the monitoring of the nugget diameter. For this, the electrode velocity at the beginning of the process and the indentation displacements in the weld and hold time are being used to evaluate the resistance spot welding process.

在之前的工作中，已经发现电阻点焊中的电极位移很有可能用作监测接头质量并随后优化焊接参数的测量因素。通过提取位移曲线中的特征点，可以创建和评估不同的参数集并预测排出的形成。这些特征点包括例如电极的最大位移、最大位移的时间、焊接中的压痕位移和保持时间、或者电极的速度。在之前的工作中，已经表明压痕位移在实验室条件下预测模压硬化 22MnB5 + AS150 熔核直径时显示出令人满意的结果。在此基础上，针对镀锌双相钢 CR440Y780T-DP GI50/50-U，展示了一种新导出的使用电极位移监测电阻点焊过程的方法。该方法结合了先前研究的知识，分为三个步骤：制造不连续性的检测、排出的评估以及熔核直径的监测。为此，使用过程开始时的电极速度以及焊接中的压痕位移和保持时间来评估电阻点焊过程。