Tension adjustment of high frequency straight seam welding pipe sizing section
In order to ensure that “tube pulling” and “tube stacking” do not occur in the forming section, welding section and sizing section, according to the rolling principle of high-frequency straight seam welded pipe (ERW), it is necessary to ensure that the welded tube blank maintains proper tension in each section. In addition to the pass speed and rolling force, the factors that affect the tension are the sizing allowance, the outer diameter of the welded pipe, the wall thickness, the deformation method, the raw material of the tube blank, the coolant, the pass shape and the surface roughness, etc. If it is large, the hole pattern is easy to wear, the strip joint is broken, and the tension is too small, and the welded pipe cannot run stably in the sizing roller, resulting in “tube stacking”. Coordination of tension between sizing section and welding section: During the welding process, the perimeter of the welded pipe blank in the welding section is shortened after being squeezed by ...