Numerical analysis of two-dimensional welding process using particle method

Abstract

In recent years, many structures were made by welding. On the other hand, new materials are used to improve the performance of the structure. However, the welding of a new material is difficult and it is difficult to predict the best condition of welding. It is hoped to develop a numerical analysis method to predict welding condition of a new material. The welding arc can be calculated by some grid method. But it is difficult to calculate the surface shape of welding pool by grid method because the surface shape of welding pool and weld penetration is deformed violently by some force. Moving particle semi-implicit (MPS) method is the numerical method which can be applied because the shape of surface is calculated easily. This method is good at calculation of large deformation and matches numerical analysis of welding process. In the present study, a particle simulation model is developed. The convection in welding pool was analyzed using these models. The Marangoni force is worked toward low temperature side in calculation. Then, the calculated weld penetration became wide and shallow. On the other hand, in calculation, the Marangoni force is worked toward high temperature side. The calculated penetration becomes narrow and deep.