Numerical simulation study on the mechanical properties and failure of laser spot welding joint
The static and dynamic mechanical properties of three kinds of laser welded joints under tensile,shearing and peeling conditions were tested,and the microstructure characteristics and hardness distribution of the spot welded joints were analyzed.The results show that the shape of solder joints is closely related to their mechanical properties,and the overall properties of C-type solder joints are bet-ter.The strength of solder joints is plastically strengthened by the increase in loading rate,and the great-er the loading rate,the more obvious the plastic strengthening is.The overall distribution of welding seam is uniform and excessively smooth,while the hardness of fusion zone and heat affected zone is high.Based on the LS-DYNA failure criterion,the numerical simulation method of laser spot welding joint failure is studied,and the effectiveness of equivalent core diameter used to simulate laser spot welding failure is clarified.
steel sheet for automobilelaser spot weldingmechanical propertiessolder joint failurenumerical simulation
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