荧光物质早已广泛用于探测铸件和模制金属件以及焊件中的裂缝。为此,将荧光物质溶解到具有良好浸润性的适宜溶剂中,以促进荧光物质渗入裂缝和裂纹内。 同样的方法可方便地运用到焊接件的探漏,这种焊件一般作为高真空系统的构件。质谱法探漏中,对于厚法兰焊缝中的缺陷或裂缝位置 Fluorescent substances have long been widely used to detect cracks in castings and molded metal parts as well as weldments. For this purpose, the fluorescent substance is dissolved in a suitable solvent with good wettability in order to promote the penetration of the fluorescent substance into the cracks and cracks. The same method can be easily applied to the leakage of the weldment, which is generally used as a component of a high vacuum system. In mass spectrometry leaks, defects or fissures in thick flange welds