Phase Transformation Monitoring of Incoloy 800H GTAW Spot Weldment

Abstract

A spot weldment of Incoloy 800H was produced by GTAW process. During cooling phase transformation of the weldment was monitored by newly developed technique for single sensor differential thermal analysis. The SS-DTA technique used in this study was developed based on linear piece-wise approximation analysis. Cooling curve from approximation and actual were compared. Precipitates along grain boundary were detected by this technique and compared with microstructure analysis. The results showed that this technique was possible for monitoring of phase transformation of this Ni-base alloy