Thin Wall 2024 Aluminum Tube

Thin Wall 2024 Aluminum Tube refers to a type of cylindrical structure made of aluminum alloy 2024 with a relatively thin wall thickness. Aluminum alloy 2024 is a high-strength, heat-treatable alloy that possesses excellent mechanical properties and good corrosion resistance.

2024 aluminum alloy is known for its high strength-to-weight ratio, making it suitable for various industries, including aerospace, automotive, and sporting goods.

It offers high strength, good corrosion resistance, and is commonly used in industries that prioritize strength-to-weight ratio and structural integrity.

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Compared with carbon steel pipes, the biggest obstacle to high-frequency induction welding of aluminum and stainless steel pipes is the influence of oxides. Due to the melting point of iron oxides (FeO 1420 degrees C; Fe2O3 1565 degrees C; Fe 1537 degrees C) and iron monochroid melting point is similar or low, so welding oxides are basically the same as the master material or before the master material reached the melting point. This makes it easier to remove oxides. This situation is completely different when welding aluminum and stainless steel tubes. First of all, aluminum is extremely easy to oxidize to hard-to-melt AL2O3, although its thickness is only 0.1 to 0.2 m. However, the melting point is as high as 2050 degrees C, while the melting point of pure aluminum is 658 degrees C. When welding, the oxide film hinders the melting and fusion of the master material, and is prone to unwelded defects. The density of oxidizing film is bigger than aluminum, it is not easy to float out of the surface of the melting pool, and it is easy to form slag defects in the weld. Similar to aluminum, whether chromium stainless steel or nickel stainless steel, there is a problem that the melting point of oxides is much higher than that of the master material. When the chromium content in stainless steel is greater than 12%, chromium is preferred to iron and oxidation and forms a dense oxide film Cr2O3 on the surface of the master material with a melting point of 2265oC. The melting point of nickel oxide (NiO) is 2090oC, which is much higher than the melting point of nickel 1446oC. Therefore, the key factor affecting the welding of aluminum and stainless steel pipes is the influence of oxides. Because aluminum oxides have the characteristics of high resistivity and uneven distribution, if the cutting quality of strips is poor, the distribution of oxides is also very irregular. In high-frequency induction welding, it is difficult to achieve the goal of complete removal. Another factor is that liquid aluminum absorbs hydrogen heavily, which is almost insoluble when solid. Therefore, hydrogen in the welding pool rapid cooling solidification crystal process, too late to escape the surface of the melting pool, will form a pore in the weld. Makes the finished pipe fail in the pressure test. Because water breaks down easily into hydrogen and oxygen at high temperatures, the presence of water can also adversely affect welding.

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