Experimental study on fatigue properties of Q420C steel welded joints at room temperature

To evaluate the fatigue life of Q420C steel welded joints, tests were performed on butt-welded cross-butt-welded joints and cross-fillet-welded joints. The strength S-N curves fitted. Then formation development cracks analyzed by fracture morphology. properties compared with literature data standard curves. results showed that test three types roughly above Moreover, joint was significantly higher than calculated values standards, indicating a large safety margin. value close to so it is suggested moderately reduce values. In addition, all standards could well predict joint. morphology specimens process damage, displacement curve damage proved in specimens.