Effect of Heat Input on Post-Weld Microstructure and Mechanical Properties in FSW X-65

摘要

Post-weld microstructure and Charpy impact properties in FSW API 5Lrngrade X-65 were examined. The objective of this work is to establishrncorrelations between weld heat input, Charpy impact toughness, andrnweld microstructures. Three different weld heat inputs wererninvestigated, and impact toughness was tested at three locations acrossrnthe weld. Charpy impact toughness along the weld centerline exhibitsrna strong correlation with weld heat input. Impact properties at thernadvancing side of the weld nugget and in the HAZ showed norncorrelation with weld heat input. However, these did show a strongrncorrelation with average hardness along the notch locations. This paperrndescribes these correlations and other factor that influence the postweldrnimpact properties.