The continuous development of 6061 aluminum plate industry brings the development of the industrial
In recent years, with the continuous development of the 6061 aluminum sheet industry, aluminum processing technology has also developed rapidly due to its many oxidative properties, low m..........
In recent years, with the continuous development of the 6061 aluminum sheet industry, aluminum processing technology has also developed rapidly due to its many oxidative properties, low melting point, fast heat conduction, large coefficient of linear expansion, and large latent heat of fusion. When the 6061 aluminum plate contains 0.5% silicon, the thermal cracking tendency is larger. As the silicon content increases, the gold crystallization temperature range becomes smaller and the fluidity is significantly improved. Therefore, the SAlSi strip welding wire has better crack resistance. When the aluminum welding pool is solidified, shrinkage, shrinkage, hot cracking and high internal stress are easily generated. In the production, the welding wire composition and the welding process can be used to prevent the occurrence of hot cracks. In the case where corrosion resistance is allowed, an aluminum alloy other than the aluminum-magnesium alloy may be welded using an aluminum-silicon alloy wire. Before the 6061 aluminum plate is welded, it should be chemically or mechanically cleaned to remove the surface oxide film. For gas welding, a flux that removes the oxide film is used. With helium or argon-helium mixed gas protection, or with a large specification of gas metal arc welding, in the case of DC positive connection, "cathode cleaning" is not required. In the case of tungsten argon arc welding, an AC power source is selected to remove the oxide film by "cathode cleaning". In the complete use of remelting aluminum ingot casting and rolling production, the melting temperature is 740 ° C ~ 760 ° C, the casting and rolling temperature is 685 ° C ~ 690 ° C, 2 kg of refining agent per ton of aluminum liquid used in refining, and enter with N2 powder, static After 20 minutes to 25 minutes, after the online degassing, the hydrogen content of the aluminum liquid in the upper flow tank is less than 0.12 mL / (100 g Al). In order to compare the change of hydrogen content in the melt when the electrolytic aluminum liquid accounts for different proportions of the melt, we use the same melting and casting process for the melt under different electrolytic aluminum liquid ratios (all electrolytic aluminum liquid, 70% electrolytic aluminum liquid, 60 respectively). The hydrogen content of % electrolytic aluminum solution, 30% electrolytic aluminum liquid and remelted aluminum liquid was tested. The test results were measured with HAD-III hydrogen meter in the upstream tank.
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