The use of rectangular recesses is permitted provided that the length and width of the recess are chosen to provide an ultrasonic signal response essentially equivalent to that obtained from the stipulated flat bottomed hole using the same equipment/transducer type combination.
在选择了凹槽的长度和宽度、使用同一设备/传感器类型的组合能提供基本上相当于从规定平底孔得到的超声信号反馈的前提下，允许使用矩形凹槽。
When testing with a double-transducer probe, only the 5 mm diameter hole is used for all the qualities as the characteristic curves corresponding to the 8 mm and 11 mm diameter holes become confused with the curve of the back-wall echo.
在使用双传感器探头的情况下，所有等级的钢板只能使用5毫米直径的孔，因为使用8毫米和11毫米的孔会导致背面回声工作曲线的混乱。
These curves shall be determined using blocks (graduated block for the curve showing the variation in the amplitude of the back-wall echo and blocks comprising the flat-bottomed holes at different depths for the characteristic curves for 11 mm, 8 mm and 5 mm diameters). The blocks are made of carbon steel with a homogenous structure and each curve shall be determined from at least five points distributed over the entire field of use of the probe. All these curves can be supplied by the manufacturer of the probe.
工作曲线用试块(分等级/刻度的试块和校对试块，通过比较不同深度平底孔背面回声的振幅变化为11毫米、8毫米和5毫米直径的孔建立特性曲线)定义。试块由碳钢材料制造，质地结构均匀。每个特性曲线须由至少5个来自遍布整个探头使用区域的点的参数来定义。所有这些特性曲线都能从探头制造商那里获取。 Thus, for a flat product of given thickness, the method consists of adjusting the amplitude of the back-wall echo to the value given by the curve for the variation of the back-wall echo amplitude and comparing the amplitude of the discontinuity echo with the characteristics curves (for 11 mm, 8 mm and 5 mm diameters) in accordance with the class selected. Only discontinuities for which the amplitude of the echo is greater than that of the characteristic curve shall be taken into account.
这样，对于一定厚度的钢板，整个检测流程包括调校背面回声的振幅使其达到特性曲线上标定的值，根据所选择的等级将来自被测试区的回声振幅与特性曲线（11毫米、8毫米和5毫米直径）的值相比较，只有来自被测试区的回声振幅大于特性曲线的参数（点）时，才考虑（裂纹的存在）。
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