In some kinds of vehicles cross beam applies cold drawn precision tube, requiring seamless look surface, high precision tolerance straightness of under 0.3/1000mm and excellent surface during further manufacturing. Other vehicle’s cross beam applies ID scarfing precision ERW tube, which is welded of material with tensile strength over 460 MPa via solid high frequency and online ID scarfing technique. Both outer and inner weld seam are smooth and coated with painting. In it turn to be an inexorable trend in heated marketing competition to apply high strength material welded tube as to supersede cold drawn precision tube.
