Analysis for the brazing deformation of AFA3G spider

Spider, the key component of the AFA3G cluster control assemblies (RCCA), is brazed with body, vanes and fingers. Vacuum brazing is crucial in the spider process and it is directly relevant to the final product quality. This paper analyze the deformation of the AFA3G spider in vacuum brazing procedure based on a large amount of data. The results indicate that the parallelism of the finger is most affected by the brazing and its deformation has obvious regularity. Deformation is mainly caused by the different contraction directions of components along with the interactions among them during cooling process. An optimized design of the brazing fixture based on the regularity and the value of the deformation greatly improves the parallelism of the fingers. Besides, the vacuum brazing procedure also affects the hole diameter of the finger, however, we could reduce the deformation by using columnar pin on the brazing fixture. (author)