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一、制订依据、目的及过程本标准是根据第一机械工业部(63)机技字4602号文,下达“关于1964～1965年国家标准和部标准制定计划(草案)的通知”20040项“焊缝X射线质量检验方法及评级标准”的规定而制订。制定本标准的目的,是由于我国工业产品的种类日益增多,焊缝X射线检验的要求不一,需要建立一个通用性的多级标准,以满足各方面的需要。目前各单位采用的苏联FOCT 20019-38三级评分制标准,实际上只有一个通过级别,且内容不够具体,各厂理解不一,而往往执行过严。另外,该标准又有某些缺点,如对于气孔的要求过严。但又允许存在深度为母材厚度的15%、长度不限的单面根部未焊透。因此该标准不能满足发展的需要。
First, the formulation of the basis, purpose and process This standard is based on the first Ministry of Machinery Industry (63) Machine Technology Word 4602, issued a “1964 ~ 1965 national standards and ministerial standard formulation plan (draft) notice” 20040 Item “weld X-ray quality inspection methods and rating standards ” provisions and the development. The purpose of the development of this standard is due to the increasing types of industrial products in China, X-ray weld inspection requirements vary, the need to establish a common multi-level standards to meet the needs of all sectors. At present, the units adopted by the Soviet Union FOCT 20019-38 three-grade scoring system standards, in fact, only one through the level, and the content is not specific enough, the different understandings of the plant, and often implemented too strict. In addition, the standard has some shortcomings, such as stomatal requirements too strict. However, it is permissible to have a depth of 15% of the thickness of the base metal, and any length of one-sided root is not welded. Therefore, the standard can not meet the needs of development.