Eliminating Surface Imperfection of High Frequency Welded Pipe by Optimizing Parameter Design of Squeeze Roller

Analyzed are the imperfection on the welded pipe surface such as indentation and molten metal pit,etc.as caused by the upper squeeze roll of the high-frequency welding pipe mill,and accordingly the upper squeeze roll of the pipe mill is properly adjusted and optimized.Relevant actions are taken,including enlarging the radium of the upper extrusion roll to get the“heel gap”thereof increased so as to obviously eliminate the line indentation on the pipe surface,and reducing the surface width of the said roll to enlarge the gap thereof so as to properly eliminate the overlap indented pit near the weld seam of the blank pipe.