Welding of aluminum pipe and aluminum products

The melting point of pure aluminum is 660 ℃. The melting point of aluminum alloy changes between 482 ℃ – 660 ℃ with the different alloy elements. When aluminum and aluminum alloys are heated from room temperature to melting state, there is no color change, which makes it difficult to judge whether they are close to the melting point.

The mechanical function of aluminum pipe and aluminum alloy changes with its purity. The higher the purity, the lower the strength and the higher the plasticity. For example, the minimum tensile strength of industrial pure aluminum hot rolled plate is between 70-110mpa, the tensile strength of industrial high-purity aluminum is only 50MPa, and the tensile strength of aluminum magnesium alloy is more than 170Mpa. Another characteristic of aluminum and aluminum alloys is that the tensile strength decreases with the increase of temperature; When the temperature decreases, the tensile strength increases and the elongation increases.

Compared with steel, aluminum has high thermal conductivity and requires high heat input during welding. Preheating is required when welding large sections. When resistance welding is used, compared with welded steel parts, aluminum needs larger current and shorter welding time to accurately control welding parameters because of its high conductivity. Because aluminum is non-magnetic, when DC welding is used, the arc will not blow off. Therefore, it can be used as a welding baffle and fixture.

Main Product

Aluminum pipe and aluminum alloy, when exposed to air, will soon form a strong adhesive and heat-resistant oxide film. Before welding, it is necessary to carefully remove this oxide film, so that the matrix and filler metal can fuse well during welding; In fiber welding, the solder has good fluidity. The oxide film can be removed by solvent or by the effect of welding arc in lazy atmosphere, perhaps by mechanical or chemical methods.

The existence of oxide film also has a protective effect on aluminum pipe and aluminum alloy. Due to its fine arrangement and strong binding force with aluminum, it can prevent the continuous oxidation of aluminum metal and protect the metal from damage. 

Moreover, the higher the purity of aluminum, the more favorable the corrosion. Due to the existence of impurities, in addition to affecting the adhesion between oxide film and metal, it may also lead to other forms of corrosion. According to this feature of the oxide film, aluminum is often used as the storage container for the media that can promote the formation of the oxide film and do not work with it, such as nitric acid and wax acid, while the media that can damage the film, such as hydrochloric acid, alkali and table salt, can quickly damage the oxide film and corrode aluminum, which is a fierce corrosive agent for aluminum, Therefore, aluminum cannot be used as a container for the storage of such media.

Although many difficult factors will be encountered in the welding process of aluminum pipe and aluminum alloy, aluminum and aluminum alloy have some unparalleled advantages compared with other materials such as copper. Therefore, aluminum and aluminum alloy welding products are increasingly widely used in aviation, aerospace, cars, machinery manufacturing, electronics, chemical industry, light industry, railways and other aspects. China has a vast territory and abundant resources, aluminum resources are very rich, and the cost of development and utilization is low. Aluminum and aluminum alloy welding has a very promising future in China.

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