Stamping Forming Technology: The connecting structure is formed through two punching processes. The first stage involves punching elliptical through holes (major axis 44-46 mm / minor axis 20-22 mm) into the steel pipe wall. The second stage involves inserting a steel ball with a diameter of 49-50 mm, using mechanical tension to shape the through hole into a standard circular hole.
Welding Assembly Process: Argon arc welding is used to connect other steel pipes at the circular hole. Examples show that multi-through structures can be formed.
Dimensional Standardization: The inner diameter of the steel pipe and the diameter of the steel ball are precisely matched (steel pipe inner diameter 50-52 mm / steel ball diameter 49-50 mm) to ensure a hole diameter accuracy of ±0.5 mm after plastic deformation.
