The inspections castings go through ensures they are equipped for the customer’s needs and tasks. Inspections include visual, dimensional, X-ray and liquid dye penetrant inspections.
1. Visual Inspection
The visual inspection involves using the human eye to detect surface defects, tears, misruns, cracks, cold shuts, gas evolution, molding flaws, metal penetration, slag adhesions and sand inclusions. This inspection is essential to ensure the casting adheres to visual acceptance standards.
2. Dimensional Inspection
The dimensional inspection ensures a part of the casting meets dimensional requirements or tolerances. This inspection can be performed manually or via a coordinate measuring machine (CMM) that utilizes probes for precise measurements. CMM is the most accurate way of testing the products’ dimensions.
3. X-Ray Inspection
An X-ray inspection of the castings can ensure they meet a quality standard. X-rays can reveal small breaks, crevices of heat cracking and shrinkage cavities. Cracks, inclusions and voids will display as a dark area due to the radiation the X-ray uses. If a casting’s mechanical properties have been compromised by holes, inclusions or shrinkage, the item can be fixed before shipment. In some cases, common surface irregularities may not affect the use of the otherwise sound casting.
4. Liquid Dye Penetrant Inspection (LPI)
With a liquid dye penetrant inspection (LPI), small surface imperfections like pores or cracks that are hard to see in metal castings are identified. First, the tester cleans the casting to eliminate dust or grit that could prevent the liquid dye from getting into the metal’s cracks.
After the metal is clean and dry, it is bathed with a penetrant solution. Different solutions are used depending on the type of LPI used, though the solution is typically an oil with low viscosity and high capillary action, which allows it to flow freely into the casting’s cracks. This dye is given dwell time to work into invisible crevices. Eventually, the excess is removed with a damp cloth. After a special developer is applied, casting defects are clearly visible.
ABOUT KEVA
Keva Casting is a professional casting company that focuses on Construction, Machinery, Automobile, Hardware, Pipeline and many other industries.
We provide top quality products with the best service based on our complete production chain including our own mold design, advanced production techniques, and full management of the supply chain. Keva Casting has two factories located in Zhucheng, China's Shandong province.
We use "shell molding", which is a new technique that has been developed in recent years.This new technique has simplified production procedures and reduced air pollution compared with traditional sand casting and investment casting. Shell making and core making are faster to ensure production in enormous quantities. The dimensions and surface finishing are satisfactory for all kinds of industrial requirements. Besides supplying our own formwork & scaffolding systems, our casting products also supply OEM services in various industries.