Two-Strands Welded Steel Tube Mill Installation

Abstract

A new two-strands welded tube mill, developed for the increase of productivity of small diameter welded steel tubes, is introduced. Detailed discussion are made on the composition of the mill which consists of two production lines and the process of production which is described as follows:
A strand of hoop steel is supplied to the uncoiler and further to the slitter in order to be divided into two strands. After slitting, each two strands are simultaneously formed, welded and finished into tubes. The two tubes thus obtained are then simultaneously cut to the predetermined length and passed through a high efficiency smoothing and fine finishing Process to obtain final products. In addition, a description is given of the improvement of production efficiency attained by the installation of the mill as well as the possibility of producing high quality welded steel tubes by the use of an automatic welding temperature control system.