Abstract: T-type joint as a representative welded joint in pressure vessels,boilers,cranes and other equipment is widely used,but because of the sudden change of its structure,in the welding joint position is easy to stress concentration,become the weak part of the equipment in the use process,so to ensure the welding quality of T-type welded joint is crucial to the safety of the overall equipment.In this paper,the finite element analysis software will be used to simulate the welding process of T-type joint,analyze the changes of temperature field and stress field in the welding process,and put forward reasonable suggestions for the welding of T-type joint.