Why is the thickness of the Tricycle With Cabin shed uneven?

Most of the common Tricycle With Cabin carports are made of iron materials. During the welding process, the iron sheet is prone to uneven thickness, which affects the service life of the carport, because thicker carports have strong impact resistance. , the thin parts are easy to be damaged. So what causes the uneven thickness?

Due to the different pressures in various parts of the iron sheet, the thickness of the iron sheet changes. Some parts are thicker and some parts are thinner. Regarding the changes in wall thickness of the calendered head, generally the thinner part of the Tricycle With Cabin shed occurs at the tangent position between the support wall section and the punch fillet. Due to the large plastic deformation produced during rolling, the cold work hardening of the iron plate will inevitably occur. The strength and hardness of the sheet will be significantly increased, and the plasticity will be reduced, thus further increasing the difficulty of rolling.
The degree of hardening of the sheet is related to the degree of deformation. In order to control the degree of hardening, the degree of deformation should be reasonably selected based on the plasticity of the material. All rolled parts with higher strength should be rolled multiple times, and recrystallization annealing treatment is required after each rolling to eliminate the hardening of the Tricycle With Cabin shed material after deformation and prevent the workpiece from cracking during reprocessing.
The rolling change of the Tricycle With Cabin shed plate thickness is related to the plasticity of the material, the bottom diameter of the workpiece, the mold gap and the fillet. Reasonable selection of the convex and concave mold gaps and fillet radius can increase the plasticity of the material, which can improve the uneven thickness.