A Study on Effect of Preheating and Post Weld Heat Treatment (PWHT) of Grade P91 Steel

摘要

ZJn the present study, bead-on-plate welds were carried out on P91 steel plates using Gas Tungsten Arc Welding (GTAW). Experiment is carried out on three control input process parameters (current, travel speed and gas flow rate) with pure argon gas, without any filler material using autogenous fusion arc welding(GTAW) to investigate the effect of preheating and post weld heat treatment (PWHT) on 6mm thick plate of grade P91 steel plates was used. The responses, weld bead geometry (in terms of bead width(BW), depth of penetration(DOP)), weld area(WA), and width of Heat Affected Zone (HAZ) width have been measured with Adobe Acrobat 9.0 Pro software. The measured weld quality in the form of weld bead geometry which played an important role in determining the input process parameters to analysis the weld structure and size of weld bead geometry. It has been found that the pre-heat and post weld heat treatment effects the microstructure and micro-hardness of welded specimen.