Analyses on microstructure and mechanical properties of friction welded joint of dissimilar powder metallurgy tungsten alloy between 93W and 98W

93W tungsten alloy and 98W tungsten alloy have their respective advantages in properties, and it is necessary to develop the composite tungsten alloy based on 93W tungsten alloy and 98W tungsten alloy.93W tungsten alloy and 98W alloy were welded by the HSMZ-10 friction welding machine developed by authors and with the optimized welding parameters.The mechanical properties and microstructure of the welded joint were tested and analyzed.The results indicate that the welded joint has good mechanical properties and no welding defects such as incomplete penetration.There is no composition homogenization between 93W tungsten alloy and 98W alloy, and the tensile strength of welded joint is higher than that of the base metals.