通常在探测某一厚度的钢板焊缝时,要用相同厚度的试块来校正。这对于我们探伤人员来讲是很不方便的,特别是我们造船厂,经常在一次探伤中要碰到几种不同厚度的焊缝,需要几种厚度的试块或很重的阶梯形试块。能否用一种既能从萤光屏上直接读出缺陷的水平位置,又能用一种轻便的试块代替多种不同 Usually in the detection of a certain thickness of the weld seam, use the same thickness of the test block to be corrected. This is very inconvenient for our inspectors, especially our shipyards, often in a test to encounter several different thickness of the weld, the need for several thickness of the test block or a heavy step-shaped block . Can use a kind of both from the fluorescent screen directly read the defects of the horizontal position, but also with a portable test block instead of a variety of different