Thickened head welding, the quality thick head http://www.guohuadianci.com/ phone 0317-8210122, Mobile 137227246651 This standard specifies the steel pressure vessel with elliptical head head manufacturing, inspection, acceptance requirements, while steel pressure vessel with elliptical head common type and parameter types and parameters given in this standard, 2, stamping, spinning and rolling the entire board, or the imposition of the types listed in Table 1 shaped steel pressure vessel with an oval head, set forth herein shall manufacture, inspection, acceptance requirements, applicable to the types listed in Table 1 elliptical head, but also the entire board, or the stitching used in other types of parameters used stamping, spinning and rolled steel oval shaped, butterfly, folding conical the ball crown-shaped head.