Development of Plasma Arc Spot Welding Process and Finite Element Method Analysis Model for Predicting Fracture Strength: Part 2—Development of Finite Element Method Analysis Model for Predicting Fracture strength.

When the welded part of a vehicle body is considered in an analysis model, the accuracy of the analysis varies depending on whether the welded part is assumed to be a simple rigid body or if its characteristics are included. Particularly, when assuming a simple rigid body, the accuracy of the stress result may be insufficient, resulting in a large error. In this study, titled "part 2-development of finite element method (FEM) analysis model for predicting fracture strength", a commercial welding simulation program, MSC Simufact welding software, was used to create a finite element method analysis model that includes the material characteristics of the welded part, and the analysis accuracy was determined in comparison with the experimental results presented in part 1. The analysis results showed satisfactory results with an error rate of 0.03%. Thus, the fracture strength and fracture position of the welding specimen could be confirmed using the FEM analysis model. Additionally, assuming that the welded part in spot welding has a simple geometric-shaped structure, a simplification spot welding model was created to determine whether it can replace the plasma arc spot welding experiment and pass the tensile shear test. [ABSTRACT FROM AUTHOR]