Firstly, the qualified chemical composition is the important precondition. Before aluminum extrusion, make sure that aluminum composition indicators meet the requirements of the national standard, especially the contents of Si, Mg, which has the important influence on its mechanical properties. The main reinforce of aluminium alloy 6061 is Mg2Si, if enough Mg2Si cannot be formed, the subsequent solid solution treatment, quenching, and aging are meaningless, it has nothing to do with reinforcement. Strictly control process when extruding aluminum profiles is a key factor to get the results of good mechanical properties. In the production due to the limitation of the actual conditions, the worker often has the difficult to control the process and doesn't realize the importance of technology, the temperature and speed controlled are lax, resulting in the limitation of aluminum products, mechanical performance is unqualified. If the aluminium bar's temperature is not hig
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