The process of small cross-section profile pipe is very special for the reason of its structure (such as small cross-section, lots of holes, and different wall thickness).

Hydro-forming's principal and technic processing are introduced and two kinds of the machine design approaches for different section tube are offered in this paper.

Manufacturing hub by cold bending special section profile can be considered as the problem of special section plate bending,which is nonlinear in physics and geometry.

Application of cement-soil retaining walls with irregular section in deep excavations;