Abstract Scope |
In order to deeply study the linear friction welding process of superalloys and the factors of joint formation, reveal the law of the initial defects in the welding process.Based on the linear friction welding experiment of superalloys, this study analyzes the characteristics of the micro-defects of the joints, using the ABAQUS finite element method, Starting from the defect categories of the superalloy raw materials, the defect orientation, the distance from the defect to the friction interface, and the material flow at the joint flash, establish a finite element model of high-temperature alloy linear friction welding, and study the law of joint formation and defects under different factors.The results show: In most areas of the joint interface, no obvious defects were found; while from the root of the joint flash to the inner of the joint at a distance of 1.5mm, the weld and the heat-affected zone were distributed with holes, cracks and inclusions of various shapes and sizes. When there are micro-defects of a certain size in the raw material, the axial shortening of the joint will be reduced. The greater the deformation resistance of the material at the defect location, the less easily the joint will be formed, and the closer the defect is to the interface, the greater the peripheral strain. Defects seriously disrupt the welding process and reduce the welding rate of joints. |