C-shaped steel C-shaped steel is produced by cold-bending hot-rolled plate. The thin wall has light weight, excellent cross-section performance and hi

1) Process flow chart for making steel structure before installation of high-rise steel structure； 2) Reasonably divide the construction flow sec

1 The causes of local deformation in welding and preventive measures 1.1 Cause The rigidity of the workpiece is small or uneven, shrinkage a