The cast steel joints have been used in more and more projects in our country because of avoiding or reducing the stress concentration of the joints. In recent years, with the cast steel joint structure of architecture more and more novel,the structure more and more complex, diversified cast steel joint style. To avoid the rest stress generated in the complex joint area by traditional welding technology, and meet the requirement of structure stress and structure construction, the cast steel joint with high quality and high strength has became important parts of large building.