The extensive knowledge of expert Pham Minh on the Whatcar forum about cars has explained quite well to the public about the materials used to produce car rims.
On the occasion of the online community being fiercely debated about the burned car rim, I would like to introduce the article as an attempt to explain why a car on fire can crumble the whole rim.
Ferrari and 1 Vietnamese-branded car caught fire and melted the whole rim
In the world, there are currently 4 main types of car rim materials , which are: iron rims, magnesium alloy rims, aluminum alloy rims and carbon fiber rims .
The advantages are excellent general-purpose alloy, with high strength, good corrosion resistance and good weldability. The disadvantage is that it is easy to deform when exposed to too high temperature (melted with soft aluminum and brittle with hard aluminum).
In manufacturing, aluminum alloy rims have many different types, which are not easy to distinguish with the naked eye, and they also have different physical properties. People distinguish aluminum alloys according to the number 1 to 7 and add the tail number to classify the composition of the compound (For example, aluminum 6061, 6063, 7075 …).
Aluminum alloy rims usually have the following types:
The downside is that you get what you pay for, can’t ask for civil rims with physical features like racing rims. Once burned, they are all destroyed (depending on the intensity of the fire, of course).
They are made by casting the spokes separately with the braces (2 parts with different “plasticity” to optimize costs and require different forces), then heat-welded, ground, painted…
Because of the fragmentation casting with different types of aluminum, when burned, we will see the phenomenon of crumbling, partly melted like candle wax. However, that does not matter because the rim is used in normal conditions (as long as the physical requirements are met) and not for burning. Besides, the car has already burned to pieces, why does the rim need to be intact?
Because the casting is fragmented, when burning, we will see the phenomenon of crumbling, partly melted like candle wax.
Through the knowledge of expert Pham Minh, we can see that, it is not necessarily the materials that burn out when the fire is bad. You have also been able to partly explain why a car catches fire and can shatter the whole rim.