The austenitic stainless steel surfacing layer on the inner wall of hydrogenation reactor is prone to crack and spread to the matrix. Magnetic powder can not be operated, penetration can only detect surface opening defects, and can not evaluate the depth of crack growth, and grinding dust in closed space greatly damages detection personnel. FGI-3D technology is the best detection method, which can quickly scan the cracks on the surface and near the surface of the surfacing layer without grinding and can also evaluate the depth and length of the cracks.

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