Camber beam, camber beam assembling and welding method, frame and frame welding method

The invention discloses a camber beam, a camber beam assembling and welding method, a frame and a frame assembling and welding method, relates to the technical field of hot metal cars, and solves the technical problem of sidewise bending after the camber beam is assembled and welded in the prior art. The camber beam comprises a first processing piece, a second processing piece, a lower cover plat and an upper cover plate, wherein the first processing piece is provided with a first horizontal part and a first arc-shaped part; the second processing piece is provided with a second horizontal part and a second arc-shaped part; and the first processing part and the second processing part are connected through the first arc-shaped part and the second arc-shaped part so as to form web plates in arc-shaped transition between the first horizontal part and the second horizontal part, and at least two web plates are connected between the lower cover plate and the upper cover plate so as to form the camber beam. Accordin