Discussion on Process of Edge Dual-radius Forming of Blank for Straight Welded Pipe

Addressing the problem that it is impossible to get desirable outermost edge deformation of the blank of the straight welded pipe by means of the conventional forming process, the new process of edge dual-radius forming is introduced. Involved here in the paper are the shortcomings of the said conventional forming process, the definition of the edge dual-radius forming process, its procedure, function, advantages and effectiveness verified by relevant operation practice as well as why the new process is worth spreading up.