Base material side thickness test block - NB/T47013-2015 Standard test block for non-destructive testing of pressure equipment

该类试块依据承压设备奥氏体不锈钢、镍合金等堆焊层厚度测量方法的要求而设计,适用于超声测厚仪用双晶直探头从堆焊层侧进行测量的校准。测试方法:单晶直探头在基材侧测量a)在与基材声学特性相同或相近的试块上,调节仪器水平线性和扫描Scope; b) Use the above test block, place the probe on the substrate and as far as possible in the center of each step, adjust the instrument gain, so that the amplitude of the interface echo between the test block and the substrate is 50 of the full scale of the fluorescent screen


The base material side thickness test block is designed according to the requirements of the surfacing layer thickness measurement methods of pressure equipment such as austenitic stainless steel and nickel alloy, and is suitable for calibration of the measurement from the surfacing layer side with the twin crystal straight probe of ultrasonic thickness gauge. The substrate is 20# steel, and the surfacing layer is 304 stainless steel.

探伤试块

Test method: The single crystal straight probe is measured on the substrate side


a) Adjust the horizontal linearity and scanning range of the instrument on a test block with the same or similar acoustic characteristics as the substrate;


b) Using the above test block, place the probe on the substrate and locate it at the center of each step as far as possible, adjust the instrument gain so that the amplitude of the interface echo between the surfacing layer and the substrate of the test block is 50% of the full scale of the fluorescent screen, read out the displayed value of each substrate thickness and the corresponding bottom wave at this time, and compare the difference between the two with the actual value of the test block one by one;


c) Place the single crystal probe on the surface of the workpiece substrate, adjust the instrument gain, so that the amplitude of the interface echo between the test block and the substrate is 50% of the full scale of the fluorescent screen, read the displayed value of the workpiece substrate thickness and the corresponding bottom wave display value at this time, the difference between the two is the thickness of the workpiece surfacing layer;


d) The displayed value of the thickness of the workpiece surfacing layer is corrected according to the comparison result in b), that is, the thickness of the workpiece surfacing layer;



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