1. Add 6061 alloy scrap during the charging process:

6063 aluminum plate china is a low-alloyed A1-Mg-Si series high plasticity alloy. During the charging process, due to misoperation, (Cu): 0.24%-0.32% of 6061 alloy waste is added, which is the ingot of 6063 aluminum plate china. The conditions are created for the generation of bright grain defects.

2. Dendrites generate bright grains:

In order to improve the formability and appearance quality of the ingot, the casting temperature is often low, so that the temperature of the liquid cavity is low during casting, and the supercooled zone in the liquid cavity expands to the bottom area of ​​the adapter plate, which will be early at the bottom of the adapter plate. Dendrites crystallize, and they grow in the liquid cavity for a long time to generate bright grains. Because the growth rate of the bright grains is very slow, and because the surrounding metal liquid flow is constantly updated, the liquid phase composition there does not change greatly during the crystallization process, and the crystallization between the bright grains and the liquid phase is always maintained. Therefore, the bright crystal grains become a solute-poor aluminum solid solution.

3. The temperature of the melt in the liquid hole is low, and the bright grains are attached to the adapter plate and gradually grow up:

Because the production of 6063 aluminum plate china round ingot is characterized by a long production interval between heats and castings, the casting plate is always in a cold state, resulting in a lower temperature of the liquid cavity melt at the beginning of casting, and the bright grains that crystallize first. It will be attached to the adapter plate and gradually grow up. When it grows to a certain extent, it will fall into the ingot, forming a bright grain structure defect at the root of the ingot.

4. The water eye is blocked, and the melt temperature varies:

The mold used in the casting of 6063 aluminum plate china is a water-eye type short mold. The circulating water is dirty, the water temperature is high, and the concentration of Ca2+ and Ms2' ions is high. During casting, some water holes are blocked, causing the surrounding part of the ingot to melt. The temperature of the body varies, which causes the metal liquid flow in the mold to fluctuate and the distribution of the liquid flow to be uneven, and the melt crystallization speed is different at the local low casting temperature, resulting in bright crystal grains.