[China Aluminum Network] Causes air bubbles on the surface of aluminum alloy profiles: Generally, the gas inside the aluminum alloy bar or the air entrapped during the extrusion process expands during extrusion and subsequent heat treatment. The surface of the profile bulges to form a defect.
Solution:
1. The internal gas content of the aluminum alloy cast rod is minimized.
2. Aluminum alloy cast rod surface requirements are clean, without oil 3. Cleaning extrusion barrel 4. Aluminum alloy rod temperature can not be too high 5. Increase the thickness of excess pressure 6. Control the amount of lubricant applied, to avoid excessive lubrication.
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