[China Aluminum Network] Air bubbles on the surface of aluminum alloy profiles are a common issue that can occur during the extrusion process. These bubbles typically form when gas trapped inside the aluminum alloy billet expands during extrusion or subsequent heat treatment. As a result, the surface of the profile may bulge, leading to defects that affect both appearance and structural integrity.
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To prevent this problem, several measures can be taken:
1. Minimize the internal gas content in the aluminum alloy cast rod by ensuring proper melting and casting techniques.
2. Maintain a clean surface on the aluminum alloy billet, free from oil, dirt, and other contaminants that could introduce air or impurities.
3. Regularly clean the extrusion barrel to remove any residual material that might cause uneven flow or entrap air.
4. Control the temperature of the aluminum alloy rod carefully—too high a temperature can increase gas expansion and lead to more bubbles.
5. Increase the thickness of the excess pressure applied during extrusion to help reduce the formation of voids.
6. Carefully manage the amount of lubricant used, as excessive lubrication can trap air and contribute to bubble formation.
By implementing these solutions, manufacturers can significantly improve the quality of their aluminum alloy profiles and reduce surface defects caused by air bubbles.
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