金属探伤翻译Artificial reflectors consisting of longitudinal,and,

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金属探伤翻译
Artificial reflectors consisting of longitudinal,
and, when specified by the using party or parties,
transverse reference notches placed on the surfaces of a
reference standard are employed as the primary means of
standardizing the ultrasonic system.
跪求达人翻译~~~~~T_T
These procedures are intended to ensure that proper beam
angles and beam shapes are used to provide full volume
coverage of pipes and tubes, including those with low ratios of
outside diameter-to-wall thickness, and to avoid spurious
signal responses when examining small-diameter, thin-wall
tubes.还有这几句也不甚明白

纵向的人工试块当被当事方指定时（使用）
位于标准试块表面的横向参考刻槽被用来作为规范超声波系统的主要工具.
有不明白的可以补充.别忘了多给分数.
补充如下：
第2段
这些程序是用来确保适当的声束角度和声束形状用以覆盖钢管全体积,包括那些外径壁厚之比小的（钢管）在检查小外径薄壁管道的时候以避免假的反射信号.
另外 pipe 和tube 在技术上有区别 ,中文翻译区别不大.

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