Tint inspection is a method of nondestructive testing. It is a surface inspection method, mainly used to detect surface damage such as cracks that cannot be recognized by the naked eye, such as the detection of stainless steel near surface defects (cracks), pores, porosity, stratification, penetration and fusion defects (also known as PT inspection). It IS SUITABLE FOR INSPECTING COMPACT METAL MATERIALS (WELDS), NON-METALLIC MATERIALS (glass, ceramics, fluorine plastics) and defects (cracks, pores, etc.) on the surface of products.
The basic principle of color detection: the surface of the material is coated with colorant, and the colorant penetrates the damaged part. Rinse the colorant off the surface after a period of time. The surface that has been cleaned is coated with a developer, and the damaged area can be seen clearly because the colorant has penetrated into it. The capillary phenomenon is mainly used to make the permeate into the defect, and the surface permeate is removed by cleaning agent, and the permeate remains in the defect, and the capillary action of imaging agent is used to adsorb the residual permeate in the defect to achieve the purpose of testing the defect.
Pre-clean the workpiece surface
Before applying penetrant inspection surface, should use cleaner clean surface clean, makes checked surface without oil, rust, chip, and other dirt lacquer layer (such as inspection of weld, on the surface of weld and weld edge should not be oxided surface scale, welding slag, spatter, etc), and then, makes the surface of the workpiece t
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