Waves and Lakes Defects
Defects
Cause
Early solidification of metal flow during casting, typically observed in decorative zinc castings. This occurs when the initial metal flow cools rapidly, forming a separate skin that does not re-melt during subsequent filling. The surface of this area exhibits a finer grain structure and a slightly different appearance compared to the rest of the casting.
Corrections
Modify metal flow characteristics:
- Reduce fill time: Significantly shorten the fill time to minimize early solidification.
- Optimize flow pattern: Adjust the flow pattern to prevent splashing and jetting in the affected areas. This can be achieved by modifying the gating system or using flow guides.
Please note that the information provided in this article is intended to be a general guide to the causes and corrections of waves and lakes in metal castings. However, it is important to note that the specific cause and correction of any particular defect will vary depending on the specific casting process, alloy, and other factors. Therefore, it is important to consult with an experienced and professional engineer to ensure that the correct diagnosis is made and the most suitable correction is chosen.