The hot-formed steel and Q345 welded joint fatigue performance has been investigated and verified.HyperLife has been used for simulation,and the simulation result has been verified through sample tests.The result shows that the simulation result and the test result are similar.There's no premature fatigue failure due to stress concentration at the welded joints.The lightweight of hot-formed steel has been investigated under similar fatigue life.Comparing with Q345,the hot-formed steel can save weight by about 6.7%.
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