How to resolve the problem of bubble� on the aluminum extrusion profile?

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How to resolve the problem of bubble on the aluminum extrusion profile?

　
How to resolve the problem of "bubble" on the aluminum profiles?

The cause for bubble generated on aluminum extrusion profile surface: usually the bubble comes from internal gas of aluminum billet or the air was drawn into the extrusion process and subsequent heat treatment expansion, then aluminum profile surface muster, generate to the defect.

Solutions:

1. Reduce the gas content in the aluminum billet. When aluminum billet melting, if you need to produce high quality billet, you can adopt online degassing machine to remove the hydrogen molecule from aluminum liquid, and you can adopt homogenizing furnace for heat treament;

2. Clean aluminum billet surface before extrusion and make sure no oil contamination;

3. Clean aluminum extrusion container, dummy block;

4. Aluminum extrusion billet temperature can ‘t be too high;

5. Increase the billet butt thickness.

6. Some clients use the lubrication to rub the dies, it may bring it to the container. So avoid it.

7. Before aging, if the aging oven stop too long time must dry it, make sure the oven should be dry.

Because if the aging oven humid, the hydrone will react on the aluminum profile when the treatment.

This information are adapted according to my own aluminum knowledge, if there is any mistake created by my translation or my knowledge, welcome to correct it
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