Aluminum alloy and magnesium alloy welding are two common welding skills in the welding industry, and the two have different performance characteristics, so the following will introduce the difference in welding performance of aluminum alloy and magnesium alloy, I hope to help everyone!

1. Different tensile strength:

The strength of the frame made of magnesium alloy material of equal volume is not as strong as that of aluminum alloy. To achieve the strength of the frame, the thickness of the material and the diameter of the tube must be added. Therefore, comparing the magnesium alloy with the aluminum alloy from the weight point of view has no advantages, and the resistance of the aluminum alloy is greater tensile strength.

2. Different fatigue strength:

The durability of the frame made of magnesium alloy material of equal volume is worse than that of the aluminum alloy frame, and it is also a fatal defect of magnesium alloy. As the number of rides increases, the number of stress attacks is also higher, the strength will decrease significantly, and even the life of the frame will not exceed 2-3 years, so professional riders rarely use magnesium alloy frames, if they are used in competitions , is also replaced by throwing away the calculated distance; it can be seen that the fatigue strength of aluminum alloy is better than that of magnesium alloy raw materials.

3. Metal oxidation is different:

The periodic table of elements clearly shows that magnesium alloys are more easily oxidized and corroded than aluminum alloys, so the application scope of magnesium alloys is also limited.

4. The production cost is different:

Because magnesium alloy is a live metal, the production equipment and environment have higher requirements, resulting in high production costs, and the cost performance of the produced bicycle frame is far less than that of the aluminum alloy frame.

5. Different specific gravity density:

Under the condition of equal volume, magnesium alloy is lighter than aluminum alloy, which is the advantage of magnesium alloy.

6. Different elastic modulus:

In summary, although aluminum alloys and magnesium alloys have their own advantages and functions, relatively speaking, aluminum alloys have more advantages and functions and are relatively widely used.

Aluminum alloy performance characteristics (physical, chemical, mechanical and technological functions):

ZAlSi7Mg (ZL101) is an Al-Si-Mg cast aluminum alloy, which can be strengthened by heat treatment, has natural aging ability, high strength and good plasticity. The alloy has excellent casting performance, good fluidity, small linear shrinkage, low tendency to hot cracking, and high air tightness, but has a slight tendency to generate porosity and shrinkage. High corrosion resistance, good welding performance and general machinability.

ZAlSi12 (ZL102) is an Al-Si eutectic cast aluminum alloy, which cannot be strengthened by heat treatment. The alloy has excellent casting performance, no hot cracking and porosity tendency, and high air tightness. Low density, good corrosion resistance, can be used in the environment corroded by the atmosphere and sea water, can accept the corrosion effect of concentrated nitric acid and hydrogen peroxide in the environment of industrial atmosphere; good welding performance. However, the alloy has low mechanical properties, poor heat resistance and machinability.

ZAlSi9Mg (ZL104) is an Al-Si cast aluminum alloy, which can be strengthened by heat treatment, and its strength is higher than that of ZL101, ZL102 and other alloys. The alloy has good casting performance, no hot cracking tendency, high air tightness, and small wire shrinkage; the tendency to form pinholes is large, and the smelting process is complicated. Good corrosion resistance, general cutting function and welding function.

ZAlSi5Cu1Mg (ZL105) is an Al-Si-Cu-Mg cast aluminum alloy, which has high strength after being strengthened by heat treatment, and its high temperature mechanical properties are better than those of ZL101 and ZL104 cast aluminum alloys. Better than the presence of copper in the alloy, the ductility and corrosion resistance decrease. The alloy has excellent casting properties and high air tightness, excellent machinability and weldability, and average corrosion resistance.

ZAlSi7Cu4 (ZL107) is an Al-Si-Cu cast aluminum alloy, which can be strengthened by heat treatment. Its mechanical properties are better than ZL104 and other cast aluminum alloys, but its casting process properties, such as fluidity and hot cracking tendency, are worse than ZL102 and ZL104. The alloy has good airtightness, weldability and machinability, but its corrosion resistance is not high and needs modification treatment.

ZAlSi9Cu2Mg (ZL111) is an Al-Si-Cu-Mg cast aluminum alloy, which can be strengthened by heat treatment. It has excellent mechanical properties at room temperature in the as-cast state and after heat treatment, and its high-temperature mechanical properties are also high. The alloy has excellent casting performance, no tendency to hot cracking, small linear shrinkage, high air tightness, good processing and welding functions, but poor corrosion resistance.

YAlSi9Cu4 (YL112) is an Al-Si-Cu cast aluminum alloy with excellent mechanical properties at room temperature and good mechanical properties at high temperature. Excellent casting properties due to high silicon content, good fluidity and thermal crack resistance. Die casting is characterized by high productivity and high casting precision.