Key Points of Aluminum Extrusion Welding Technology

　　Aluminum extrusion welding is a complex process that requires careful attention to various factors to achieve high - quality welds. Aluminum has unique properties, such as a high thermal conductivity and a tendency to form a tenacious oxide layer on its surface, which pose challenges during welding.

　　One of the primary considerations in aluminum extrusion welding is surface preparation. Before welding, the surfaces to be joined must be thoroughly cleaned to remove any contaminants, including oils, grease, and oxide layers. Chemical cleaning methods, such as using solvents or alkaline cleaners, are often employed. Mechanical methods like wire brushing or sanding can also be effective in removing the oxide layer. This is crucial because the oxide layer can prevent proper fusion between the aluminum parts and lead to weak welds.

　　The choice of welding process is another important factor. Tungsten Inert Gas (TIG) welding is a popular method for aluminum extrusion welding. It uses a non - consumable tungsten electrode to produce an arc, and an inert gas, such as argon, is used to shield the weld area from oxidation. TIG welding offers precise control over the welding process, resulting in high - quality welds with good aesthetics. it requires skilled operators and is relatively slow.

　　Metal Inert Gas (MIG) welding is also commonly used for aluminum extrusion welding. In MIG welding, a consumable wire electrode is fed through the welding gun, and an inert gas is used for shielding. MIG welding is faster than TIG welding, making it suitable for high - volume production. But it may require more post - weld cleaning due to spatter.

　　During the welding process, controlling the heat input is essential. Aluminum has a high thermal conductivity, which means that heat dissipates quickly. If the heat input is too low, insufficient fusion may occur. On the other hand, if the heat input is too high, it can cause distortion and loss of mechanical properties. Proper welding parameters, such as welding current, voltage, and welding speed, must be carefully selected to ensure optimal heat input.

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