Analyze the mainstream penetration method of space frame steel structure flaw detection

Method one

Color flaw detection 

The space frame steel structure flaw detection process is to clean and dry the surface of the weldment, spray a layer of penetrant liquid with a strong color, and remove the excess penetrant from the surface after the defect has penetrated for a certain period of time. Then spray the developer, which absorbs the penetrant that has penetrated into the defect, and displays a colorful defect image on the developer layer. At present, surface defects with a width of 0.01mm and a depth of not less than 0.03-0.04mm can be found.

Advantages: Colored flaw detection is a low-cost and convenient non-destructive flaw detection method for surface flaw detection by penetration method.

Method two

Fluorescent flaw detection

Fluorescence inspection is a method of non-destructive inspection of weldment surface defects by using the characteristics of ultraviolet light to irradiate certain fluorescent materials to produce fluorescence. After imaging for about 5 minutes, the magnesium oxide powder at the defect is soaked by the fluorescent penetrating liquid, and the excess magnesium oxide powder on the surface of the workpiece is blown off. Observed under the ultraviolet lamp in the darkroom, the fluorescent material left at the defect emits fluorescence, showing the outline of the defect . After imaging for about 5 minutes, the magnesium oxide powder at the defect is soaked by the fluorescent penetrating liquid, and the excess magnesium oxide powder on the surface of the workpiece is blown off. Observed under the ultraviolet lamp in the darkroom, the fluorescent material left at the defect emits fluorescence, showing the outline of the defect.