Forging quality inspection items are as follows:

(1) Geometric Shape and Dimensions

General forgings are inspected for dimensional accuracy using steel rules, calipers, and templates; complex shaped die forgings can be inspected using the marking method.

(2) Surface Quality

Surface cracks, indentations, or folding defects on forgings are generally visible to the naked eye. Sometimes, cracks may be very small, and the depth of the fold may not be clear. In such cases, inspection can be made after cleaning and scraping; if necessary, ultrasonic testing can be employed.

(3) Internal Organization

Internal defects such as cracks, inclusions, and porosity in forgings can be inspected visually or with a magnifying glass between 10 to 30 times on the forging cross-section macrostructure. A commonly used method in production is acid etching inspection, where a sample is cut from the area of the forging to be inspected and immersed in an acid solution to clearly reveal the defects in the macrostructure of the cross-section, such as forging flow lines, cracks, and inclusions.