スポット溶接現象の解析

概要

論文の詳細を見る
In spot welding, some defects like crack and explosion may occur if various conditions are inappropriate. They make quality of products coarse. Therefore, appropriate conditions to material and shape of a sample are required. For research the conditions, it is important to analyze the spot welding phenomenon. It is, however, very complex and the analysis has hardly been done. In this paper, numerical analysis using a simple model we proposed has been carried out. This model includes applied voltage to the sample, potential-distribution and temperature-distribution in the sample, phase change from solid to liquid and change of the shape. The 2-dimensional Finite Element Method (FEM) is applied to analysis of potential-and temperature-distribution. As the results, it has been found that temperature of top of projection becomes maximum about 10 ms after rushing of current and two maximum temperature parts appear momentary while the welding is progress. These results have been verified by measurement using a special radiation thermometry. And size of a nagget presumed by the simulation nearly corresponds to measured one. The model we proposed is very simple, nevertheless, it represents the real system well.
日本シミュレーション学会の論文
1993-03-15