In general, the lost wax casting wax injection after remove the wax models will be more or less has some problems, such as flash, multiple edge, broken jaw, visible to the naked eye of sand holes, part or the whole structure deformation, holes impassability, the first line is not clear, flower heads on and so on.For flash, multiple, and unclear, flower heads with heads while defects such as surgical blade can be used light;For sand holes, broken jaw can use welding welding repair rabbit;Can use the welding needle holes of penetration;Deformation for the wax models in 40 ~ 50 ℃ hot water.In addition, for the hand of different ring, if by the time of mold to change refers to the circle, there is no doubt that both work and fees.So the general manufacturing enterprises are in the wax models directly change refers to the circle.To used circle welding wax is very convenient and blade shaping the weld can be used after welding is good.