Numerical Simulation Research on Welding Temperature Field of 304 Stainless Steel

摘要

Using finite element software SYSWELD, we did three-dimensional dynamic simulation studies of 304 stainless steel flat TIG welding temperature field. The results obtained transient temperature field distribution chart and thermal cycling curve of feature points. Compared with literature data, the established numerical simulation model shows that it can simulate well the welding temperature field. The results offer important reference to study on stress and strain of welding seam, reducing welding stress and deformation. 304 stainless steel belongs to the austenitic stainless steel series, and is widely used in stainless steel application. 304 stainless steel has excellent corrosion resistance, heat resistance and low-temperature strength. Its welding performance is slightly better compared to other stainless steel, but poorer than low carbon steel. The thermal conductivity of austenitic steels is about 1/3 of low carbon steels'. The thermal expansion coefficient is about 50% larger than the low carbon steel. With the increasing of line energy of welding process, welding stress and deformation will get more serious, austenite grains tend to become coarse, which will lead to poorer welding performance. In response to these problems, using the finite element software SYSWELD to study numerical simulation of 304 stainless steel welding temperature field, we intended for simulation studies of transient temperature field and thermal cycling curves of the welding process, analyzed temperature field and thermal cycling curve characteristics, and the relationship between phase transitions and temperature variations. This will provide the basis for study on stress and strain of welding seam, reducing welding stress and deformation, and also reference for the improvement of austenitic stainless steel welding performance.