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nature : a nondestructive testing. It is based on solid-liquid with capillary permeability and wettability of physical phenomena to detect objects. The operation, first detected by immersion in the workpiece with high penetration capacity of liquid infiltration, infiltration of fluid into the workpiece surface defects, and then excess fluid infiltration clean, then deposited coated with a layer of strong adhesion and pro-white imaging agent to defect into the infiltration of fluid aspirated, this time in the White color coating on showing the shape and location of the apparent pattern. The advantage of this detection equipment is simple, intuitive display, economical and practical, and easily understandable principles, they can show the direction of various types defects, particularly for large workpieces and the irregular parts and on-site inspection of the workpiece with outstanding advantages. Deep drawback is still difficult to detect defects, operational procedures, processes than tedious. But in the field of industrial application is very extensive.
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