Abstract
Effect of the corrosion environment on the fatigue strength of AZ31 magnesium alloy/SUS304 stainless steel of friction welded joints, which were welded by a N/C controlled friction welding machine, has been investigated. The fatigue tests were conduced by Ono's rotary bending tester for smoothed specimen. The fatigue strength of welded joint, which was tested in air, was lower than that of the based metal irrespective of the number of cycles to failure, and the fatigue limit was 75% of the base metal. In case of immerse joint in salt water for 8 hours, number of cycle to failure was increasing with decreasing of applied stress, and the fatigue limit obtained 36% to that of the base metal. The fatigue strength of welded joint, which was tested under corrosion environment, decreased almost lineally with the increase of the number of cycles to failure and fatigue limit was not recognized. All the welded joints were fractured near the weld interface under corrosion environment.
