论文部分内容阅读
《蒸汽锅炉安全监察规程》要求“锅筒的全部对接焊缝和集箱的纵向对接焊缝应进行100％射线探伤或者100％超声波探伤加至少25％射线探伤”。在编制焊缝X射线探伤工艺时注意到,对焊缝进行100％X射线探伤时,若将两相邻胶片的中心距或者重叠长度放置过大或过小,都将在焊缝中出现漏检“三角盲区”(如图1所示)。根据初步了解,在行业中有很多单位编制焊缝X射线探伤工艺时没有注意这个问题,可能造成焊缝在此区出现漏检。为了严格执行“规程”,确保产品的安全运行,笔者就如何确定两相邻胶片的中心距和重叠长度进行一些讨论。
The Steam Boiler Safety Supervision Regulation requires that “100% radiographic testing or 100% ultrasonic testing plus at least 25% radiographic testing shall be carried out on” all butt welds in the drum and longitudinal butt welds in the header. “ In the preparation of X-ray weld inspection process, we noticed that when the weld is subjected to 100% X-ray inspection, if two adjacent film center distance or overlap length placed too large or too small, will appear in the weld leak Check ”triangle blind zone“ (shown in Figure 1). According to preliminary understanding, there are many units in the industry when preparing the weld X-ray inspection process did not pay attention to this problem, which may result in missed weld inspection in this area. In order to strictly implement the ”rules" to ensure the safe operation of the product, the author discusses how to determine the center distance and overlap length of two adjacent films.