In the common terminology of the aluminum alloy die-casting industry, the so-called cold shut refers to the cracks or seams that appear in the workpiece after casting. These cracks or seams are caused by the incomplete fusion of the molten metal.

Cold shut refers to the fact that when filling the casting cavity, the molten metal fails to fully fuse, forming an incompletely connected seam. During the die-casting process, due to the different cooling rates of various parts, the temperature in certain areas will be lower, resulting in the failure of the molten metal to completely solidify. Therefore, during the cooling process, seams or cracks can form, creating a cold shut. The existence of a cold shut will seriously affect the mechanical properties of castings, and will also reduce the quality of castings.

In addition, it is worth noting that during the aluminum alloy die-casting process, there is a casting defect that is very similar to the cold shut, called "cold slug". Cold slugs refer to metal particles that are not completely melted during the smelting process of aluminum alloy materials.

What is aluminum alloy die-casting cold material?

The material used for aluminum alloy die-casting is put into the furnace in solid form and heated so that it melts into liquid metal for die-casting. However, during the material feeding or melting process, sometimes solid material that is not completely melted remains in the liquid metal. These residual parts are called cold materials.