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1 关于薄壁钛焊管加工缺陷的允许范围 为了保证薄壁钛焊管在发电站用冷凝器中的使用安全性,必须从其使用条件和所要求的使用寿命出发,研究其加工过程中产生的各种缺陷的许可范围,从而制定出非破坏性检查方法和缺陷的判定标准.它是钛质量保证体系中最重要的研究课题之一。 在日本,根据发电站用冷凝器的实际使用情况,假定冷凝器的使用寿命为lOOa,在每年进行的12次管路清理工作中,薄壁钛焊管将承受333.43bMPa的圆周应力。即:如果薄壁钛焊管在333.43MPa的圆周应力下,可使用1200次,则认为冷凝器是安全的。
1 on the thin-walled titanium pipe machining allowable range of defect In order to ensure the thin-walled titanium welded pipe in the power plant condenser safety, must be based on its conditions of use and the required service life, the process of its research produced The scope of permissible defects, to develop a non-destructive inspection methods and defects of the criteria.It is one of the most important research topics in titanium quality assurance system. In Japan, based on the actual usage of condensers in power stations, assuming a condenser service life of 100 a, 12 annual pipeline cleaning work carried out, thin-walled titanium welded pipe will withstand the circumferential stress of 333.43bMPa. That is: If the thin-walled titanium tube in the circumferential stress of 333.43MPa, can be used 1200 times, then that the condenser is safe.