ICS 25.160.40 CCS J 33 DL 中华人民共和国 电力行业标准 DL/T 820.3—2020 管道焊接接头超声波检测技术规程 第3部分：衍射时差法 Code of u ltrasonic testing technique for butt welds of pipes — Part 3：Time of flight diffraction 2020 - 10 - 23发布 2021 - 02 - 01实施 国家能源局 发布 DL/T 820.3 —201X I 目 次 前 言 ................................ ................................ ................................ ................................ ................................ III 1 范围 ................................ ................................ ................................ ................................ ................................ .. 1 2 规范性引用文件 ................................ ................................ ................................ ................................ .............. 1 3 术语 ................................ ................................ ................................ ................................ ................................ .. 1 4 一般要求 ................................ ................................ ................................ ................................ .......................... 4 4.1 检测人员 ................................ ................................ ................................ ................................ ............. 4 4.2 检测设备 ................................ ................................ ................................ ................................ ............. 4 4.3 试块 ................................ ................................ ................................ ................................ ..................... 5 4.4 耦合剂 ................................ ................................ ................................ ................................ ................. 6 5 检测准备 ................................ ................................ ................................ ................................ .......................... 6 5.1 资料查阅 ................................ ................................ ................................ ................................ ............. 6 5.2 检测区域 ................................ ................................ ................................ ................................ ............. 6 5.3 扫查面的要求 ................................ ................................ ................................ ................................ ..... 6 5.4 探头的选择 ................................ ................................ ................................ ................................ ......... 6 5.5 母材的检测 ................................ ................................ ................................ ................................ ......... 7 6 检测设置 ................................ ................................ ................................ ................................ .......................... 7 6.1 检测分区 ................................ ................................ ................................ ................................ ............. 7 6.2 PCS设置 ................................ ................................ ................................ ................................ .............. 7 6.3 扫查方式的选择 ................................ ................................ ................................ ................................ . 7 6.4 扫查步进设置 ................................ ................................ ................................ ................................ ..... 8 6.5 数据显示、记录范围的设置 ................................ ................................ ................................ .............. 8 6.6 信号平均化处理 ................................ ................................ ................................ ................................ . 8 6.7 脉冲重复频率设置 ................................ ................................ ................................ .............................