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Welding characteristics of Mingtai Aluminum 5052 aluminum alloy

Edit:admin001 Date: 2019-05-23 15:51
The 5052 aluminum sheet is often used as a decorative panel material because of its excellent molding properties, corrosion resistance, weldability, and fatigue strength. A good welding process is a prerequisite for obtaining a good product. What kind of aluminum-magnesium alloy welding characteristics does the 5052 aluminum plate have?
1, strong reduction ability
The affinity between aluminum and oxygen is very strong. Aluminum is easily oxidized in air to form a dense and strong A1203 film with a film thickness of about 0.1 μm. The melting point of A1203 is as high as 2050 ° C, which is much higher than the melting point of aluminum and aluminum alloy (500). One 600 °C). During the soldering process, the oxide film hinders good bonding between the metals and is liable to cause slag inclusion. The aluminum oxide film also adsorbs moisture, which causes the weld to create pores during welding.
2. Higher thermal conductivity and specific heat capacity
The thermal conductivity and specific heat capacity of aluminum and aluminum alloy are more than twice that of carbon steel and low alloy steel. During the welding process, a large amount of heat is quickly transferred to the interior of the base metal, so the heat is removed when welding aluminum and aluminum alloy. Consumed in molten metal, more unnecessary consumption in other parts of the metal.
3, the hot cracking tendency is large
Aluminum has a linear expansion coefficient of about 22.9 x 10-6/°C and iron of 11.7 x 10-6/ °C. Aluminum and aluminum alloys have a linear expansion coefficient that is about twice that of carbon steel and low alloy steel. When the aluminum solidifies, the volume shrinkage rate is as high as 6.5%, and the iron is 3.5%. Therefore, aluminum and aluminum alloys are prone to shrinkage, shrinkage, hot cracking and high internal stress during welding.
4, high porosity sensitivity
Aluminum and aluminum alloy liquid molten pools are easy to absorb hydrogen and other gases. A large amount of gas dissolved at high temperature is too late to be precipitated during cooling and solidification after welding, and pores are formed in the weld. The moisture in the arc column atmosphere, the welding material and the moisture adsorbed by the oxide film on the surface of the parent metal are all important sources of hydrogen in the weld.
5. No color change during solid liquefaction
When the aluminum and aluminum alloy welding pool metal changes from solid to liquid, there is no obvious color change, which brings inconvenience to the welding operation.
The above is about the welding characteristics of the aluminum-magnesium alloy of the 5052 aluminum plate. The 5052 aluminum plate has good friction stir welding performance, dynamic recrystallization occurs in the weld zone, the weld grain is refined, and the weld can be realized from 0 °C to 180 °C. . Arbitrary bending, optimized process parameters can make the welded joint strength up to or higher than the base metal.
Mingtai Aluminum produces high quality 5052 aluminum sheets with low price
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