When cutting and blanking, the size of the flange plate is different, resulting in the inconsistency of the size of the H-shaped steel and the corbel, and the upper and lower flange plates of the steel beam connected with the corbel are misaligned by about one plate thickness; there are deep cut marks on the cutting edge, There are obvious depressions on the edge of the board, or there are deep sawtooth marks, the cutting roughness exceeds the standard, the edge of the panel is not vertically cut, and the splicing of the wrong side exceeds the standard.