在放射性化学和原子能工业部门,作为输送活性介质的管系,大都是由18—8铬镍奥氏体不锈钢管焊接而成。这类管系的焊接接头,除要满足规定的机械性能要求和作百分之百射线检查外,还对根部焊缝的内表面质量提出了较高的要求;要求焊缝内表面成形平整光滑,内凹不超过0.5～1毫米;焊缝表面有 In the radiochemical and atomic energy industries, piping systems that transport active media are mostly welded from 18-8 chrome-nickel austenitic stainless steel tubes. In addition to meeting the required mechanical performance requirements and performing 100% ray inspection, the welded joints of such piping systems also place higher requirements on the quality of the internal surface of the root weld; require that the inner surface of the weld be formed with smooth, Not more than 0.5 ~ 1 mm; weld surface