钢垫板焊接后一般会与焊缝熔合在一起，在超声波检测时，来自焊缝根部缺陷的回波与垫板位置出现的结构回波混杂在一起，给现场检测作业时波形的判断带来一定难度，通过总结现场检测经验和试验验证，梳理出一套能有效区分垫板结构回波的方法。

After welding the steel plate is generally fused together with the weld seam. On ultrasonic testing of the weld defect, echoes from the weld root were normally mixed together with the structural echoes from the back plate position, which should bring certain difficulty for the correct judgment of the defect echoes for on-site testing. By summing up the test experience and test verification, an effective echo identification method was deduced, which could effectively distinguish between the above-mentioned echoes.