Research status of fusion welding process in welding performance optimization of superalloy

Superalloy is an alloy material with good mechanical properties such as processing performance, fatigue performance and fracture toughness, and it has been widely used in the aerospace field. As a traditional mechanical processing technology and connection method, welding technology is widely used in automobile manufacturing, shipbuilding, aerospace and other fields, and it occupies a very important position in the national industry. The fusion welding process is the most widely used welding process for superalloy. However, due to the increasingly harsh service environment, chemical composition of superalloy becomes complex, welding difficulty is increasing, and welding performance of superalloy is affected. Therefore, it is of great significance to study welding process of superalloy. The main research progress on fusion welding process of superalloy is mainly introduced in this paper, and weldability of fusion welding is studied around crack formation mechanism and influence of welding process on microstructure and properties of welds. At the same time, the way to solve welding crack is proposed to improve properties of superalloy and provide guidance for the processing and manufacturing of welded structure of superalloy.