抄録
Joint microstructures and fatigue behavior of ferritic stainless steel type 430 welds with different weld metals were investigated. Two weld metals with different chemical compositions, NbL1 and NbL2, had been used for the MIG butt welding of type 430. NbL2 with Al and Ti showed fmer grains in the weld microstructure than NbL1. In both NbL1 and NbL2 welds, the hardness of heat affected zone (HAZ) was the highest due to the formation of hard martensite. Fully reversed axial fatigue tests have been performed using smooth specimens of welds and base metal at ambient temperature in laboratory air. The fatigue strengths of both welds were increased compared with the base metal, which could be attributed to the increase of hardness in weld zone. The fatigue strengths of NbL1 and NbL2 welds were nearly the same.
