1986 年 4 巻 4 号 p. 662-666
The sectional area at weld interface of upset welds at final period of welding has been found to be measured in real time by both weld resistance and effective time-integral value of weld voltage for low carbon steel rod.
The current path area is related to weld resistance, current path length, and average resistivity, which is a function of material composition and average temperature at welds, based on Ohm's law. It is clarified that average resistivity at welds can be determined from effective time-integral value of weld voltage. So the sectional area at weld intrefacecan be measured by both weld resistance and effective time-integral value of weld voltage and this method can be adopted as one of monitoring parameter for estimating the welding quality of low carbon steel rod.
According to the results, effective time-integral value of weld voltage and weld resistance are shown to be fundamental monitoring parameters of upset welds with prepared edge. Furthermore, this monitoring system is shown to be effective in assurance of upset weld quailty with no relation to weld condition, edge angle and so on, for low carbon steel rod.