The effect of welding positions on the weldability of X20CrMoV11-1 steels

Abstract

In the study, mechanical properties of martensitic steel X20CrMoV11-1 was investigated after being welded using Tungsten Inert Gas (GTAW) welding method at different weld positions (PC and PJ-EN 6947). The X20CrMoV11-1 steels have been widely used in thermal power plant applications in combustion chambers and other high-temperature parts. These materials experience extremely high internal pressure at the service conditions. WCrMoV12 Si was used as the filler metal in the welding. The GTAW welding process was conducted in a controlled manner and all the parameters used during the process was monitored. The post welding heat treatment was applied in order to eliminate the variations in the hardness of the welded materials. The samples were characterized using tensile, bending, hardness, and notch impact tests. Macro photographs were taken from the samples to observe the transition areas. The results indicated that the mechanical properties obtained from the samples welded in PC position were higher than those obtained from PJ position.