The forgings are subjected to pressure, typically through the use of a hammer or pressure. The forging process builds fine grain structures and improves the physical properties of the metal. In the practical use of parts, a correct design can make the particle flow in the direction of the main pressure. Forgings internal quality inspection is to check the internal quality of the forgings themselves, is the quality of the appearance quality inspection can not be found, it contains both inspection of the internal defects of the forgings, also contains the mechanical properties of the forgings, and the important parts, key parts or large forgings should also be chemical composition analysis. For internal defects we will check through low power inspection, fracture inspection, high power inspection method to check whether there are forgings such as internal crack, shrinkage hole, loose, coarse crystal, white point, dendritic crystallization, streamline does not conform to the shape, streamline disorder, flow, coarse crystal ring, oxide film, stratification, overheating, burning tissue defects. The mechanical properties are mainly to check the normal temperature tensile strength, plasticity, toughness, hardness, fatigue strength, high temperature instantaneous fracture strength, high temperature durable strength, durable plasticity and high temperature creep strength.
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