1. Expansion: Heating the iron rims causes them to expand, making it easier to fit them onto the wooden wheels of the cart. As the rims cool, they shrink back to their original size, creating a tight and secure fit.
2. Malleability: Heating the iron rims makes them more malleable, allowing them to be shaped and formed more easily. This is important for creating the proper curvature of the rims and ensuring that they fit snugly against the spokes of the wheels.
3. Stress relief: Heating and cooling the iron rims helps to relieve any internal stresses or strains that may be present in the metal. This can help to prevent the rims from cracking or breaking under the stress of use.
4. Durability: The heating and cooling process can help to improve the overall durability and strength of the iron rims. This is important for ensuring that the rims can withstand the rigors of use on rough roads and terrains.
5. Aesthetics: Heating the iron rims can also help to improve their appearance. The heating process can create a more uniform and polished finish, giving the cart a more aesthetically pleasing look.
