The casting of aluminum parts is a process of casting from metal to obtain aluminum parts and aluminum parts castings. Aluminum parts casting has fluidity, shrinkage, heat resistance, air tightness, casting stress, and gettering.
The slag is mostly distributed on the upper surface of the casting, and the corner of the mold is not vented. The fractures are mostly off-white or yellow, which can be found by X-ray or mechanical processing, and can also be found during alkaline washing, acid washing or anodizing.
Stomatal bubbles are pores in the wall of the three castings that are generally round or oval in shape, have smooth surfaces, are generally shiny oxide scales, and are sometimes oily yellow. Surface pores and air bubbles can be found by sandblasting, internal pores can be found through X-ray fluoroscopy or mechanical processing. The air bubbles appear black on the X-ray film.
That is, the shrinkage of aluminum castings generally occurs in the thick parts of the root of the fly riser near the inner runner, the thickness of the wall, and the thin wall with a large plane. In the as-cast state, the fracture is gray, and the light yellow is grayish white or yellowish or grayish black after heat treatment. On the x-ray film, a cloud-like severe shrinkage can be found by X-ray, low-fluorescence fracture and other inspection methods.