Research on the Extraction of Controlling factors in the Resistance Spot Welding Using Pressure Change due to Nugget formation.

在电阻点焊过程中，研究了直接提取控制因素，以建立质量良好、稳定的焊块。用直接法证明了高压的产生及其冶金效应是溶质元素的大偏析。利用这种通过电极的压力变化，研制了一种带有反馈系统的计算机控制电阻点焊机。对金属薄板试样（AI, Fe, Brass, Sus）的实验结果表明，监测并反馈给计算机的控制因素不仅是压力变化，还有微膨胀。此外，有必要精确地测量和控制这种微膨胀。

During resistance spot welding, direct extraction of Controlling factors for the establishment of good quality and stable nuggets was examined.High pressure generation and its metallurgical effect that was a great segregation of solute elements were shown by direct method.Using this pressure change through electrodes, a computer controlled resistance spot welding machine with feed back system was developed for this research.Experimental results obtained by the thin plate metal specimen (AI, Fe, Brass, Sus) indicated that the Controlling factors for monitoring and feeding back to computer were not only a pressure change but also a micro dilation.Furthermore, it will be necessary to measure and to control this micro dilatation precisely.