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Identifying Defects in Grey Iron Castings
por Suzanne Denehy (21-12-2023)
There are many chances for defects to take place during the process of casting. In any casting products defects are undesirable as they damage the quality of the product. Identifying the type defect helps to know whether the defect can be fixed or eliminated. Identifying the type of defect is very important because only then you get an idea about what to do with them. When you are able to recognize the defect exactly it helps the quality control department to find the root cause of the defect and also find ways to fix them. Here are some common defects that occur in castings.
Shrinkage Defects:
When you pour the molten cast iron into mould it gets solidified. After solidification the casting tends to shrink and when there is not sufficient metal available the shrinkage of cast iron products create holes in the casting product. There are many types of this defect based on the cause.
Axial shrinkage forms a cavity in the middle of the product. This is formed because the centre of the iron casting takes a long time to solidify or freeze when compare to other metals on the sides. There are lot of factors that causes this defect and they are temperature of the molten iron, speed at which it is poured, quality if alloy in cast iron and imperfection in the thickness of the casting mould.
Dispersed shrinkage forms cavity perpendicular to the casting surface. This happens because of the variation in the alloy elements. If the nitrogen content present in the alloy is more or the carbon content is less, then this might give rise dispersed shrinkage.
Improper shrinkage produces difference in variations. This defect can takes place in all the casting products. When the alloy elements solidify at different rates in furnace then this defect takes place. It is very important to avoid this defect because if it happens then the product has to be remade which may result in loss.
Seams:
Seams are also known as scars. It falls under the category of metallurgical defect and it is characterized by the presence of depression on the surface of the casted product. The movement of graphite into the shrinkage region causes seams.
Stag Inclusions:
This defect is caused due to the inclusion of harmful materials such as metal carbides, calcites, oxides etc. Stag inclusions are identified by the presence of shallow spots or drops on the surface.
Rat Tail:
The tiny projections found on the surface of the casting products are the characteristics of rat tail defect.
Blowholes and Pinholes:
They are the cavities found on the surface of the product. The cavities vary in size and depending on the size they are called as blowholes or pinholes.
VR Foundries is one of the best casting foundries in coimbatore, India. The manufacturer provides high quality grey iron & SG(Ductile) iron casting for various industries such as automobiles, pump manufacturers, textiles, hydraulics and read more.