Numerical Analysis of Welding Heat Source Temperature Field

Abstract

This article studies the numerical simulation analysis of the temperature field of welding heat sources. During the welding process, the rapid input of local heat and subsequent rapid cooling can cause permanent plastic deformation of the weld seam and its surrounding area, resulting in residual stress and deformation. In order to accurately grasp the variation law of the welding temperature field, this article uses ANSYS software for numerical simulation, and uses birth and death element technology and volume heating rate to simulate the welding temperature field. In the simulation, convection and heat conduction are mainly considered, and the heat source is simulated by applying the heat generation rate at the nodes of the welded components. Taking Q235 thick plate T-joint as the research object, a double-sided weld model is established, and thermal analysis is carried out using ANSYS software. The results indicate that during the welding process, the temperature at the weld seam rises sharply and then diffuses to the surrounding area, forming a trend of diffusion from the centerline of the weld seam to the surrounding area. After a period of welding, due to the influence of welding sequence, the welded part will form a quasi steady state temperature field with a steeper temperature gradient behind the heat source.