Resistance Spot Welding Characteristic of 1500MPa Steel Sheet Using Simulation (II) - Estimation Model for Nugget Diameter of Resistance Spot Welds -

As environmental regulations and car safety regulations have been strengthened globally, automobile industry have tried to overcome these regulations. One of solutions is to apply various High Strength Steel (HSS) to car body, which reduce the weight of car bodies and increases its strength. However, the combination of lecture type and thickness are very various and it will take a lot of time to conduct welding evaluation through experiments. In order to solve these problems, evaluation of resistance spot welding is being performed using simulation. In this study, resistance spot welding was simulated to produce nugget diameter of 1500 MPa steel. As a result, a lobe curve can be obtained and a two regression model is proposed as a model that can predict the nugget diameter of the welded part. We also proposed a two regression model with minimized input arguments. The performance of these models was evaluated in terms of the coefficient of determinant and average error rate. Key words: Resistance spot welding, Weld simulation, Nugget diameter, Regression model