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.

Molten Pool Behaviors in Double-Sided Pulsed GMAW of T-Joint: A Numerical Study

“…This is the result of a much smaller dr pared with [30]. The outward flow driven by Marangoni stress has also different simulation approaches [45,46]. It does play an essential role in ing.…”

[Paper] Droplet Formulation Method for Viscous Fluid Injection Considering the Effect of Liquid-Liquid Two-Phase Flow

“…al. 9) analyzed a molten site with a MPS-based welding simulation by considering not only surface tension but also Marangoni force. Shino et al 10) performed a press molding analysis of CFRTP (Carbon Fiber Reinforced Thermo Plastics) with MPS method.…”

Modification of the LSMPS method for the conservation of the thermal energy in laser irradiation processes

“…Therefore, the accurate interpolation is no longer possible even if the least‐square formulation is applied. Although particle methods have been successfully applied for thermal problems such as the heat conduction and natural convection, the thermocapilary flow, the semisolid forging, the plasma arc welding, the laser welding, the direct laser interference patterning, the molten core‐concrete interaction for a nuclear reactor, the melt freezing for a nuclear reactor, the eutectic interaction of molten uranium, and the stratification and solidification/melting for a nuclear reactor, that is not the case for the least‐square formulations, which were not used in the analyses listed above. There are some works in which the thermal problems are simulated by using the first‐order particle methods.…”