1.3 Machining Properties
WARNING: This page is about a different variant/trim than selected.
| Properties of aluminium compared with steel | Effects |
|---|---|
| Aluminium parts are magnetically neutral. | Attachment with magnetic tools/working aids is not possible. |
| Elasticity is only 1/3 as high. | Convertibility is limited in comparison with steel. |
| Elongation failure is approx. 50 % slighter. | Overstretching the material results in strain-hardening and an increased tendency of cracking. |
| Electrical conductivity is almost 4 times higher. | Electric welding methods require different equipment (MIG welding). |
| Material expansion during heating is twice as high. | The material expands more markedly. Shorter heat treatment is necessary for removing dents. |
| Thermal conductivity is 3 times higher. | Heat is drained more quickly. Adjoining working areas are affected more heavily e.g. during welding. |
| Structural transformation between 200 °C and 250 °C | Elongation characteristics and thus plasticity are improved. Strength is reduced.
IMPORTANT:
No heat treatment during repair work on the vehicle structure! Workshop operation doesn't make it possible to control the temperature to sufficiently exact levels.
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| Aluminium shows no annealing colours. | The melting point is 650 °C. Once the melting temperature has been reached, the material begins to flow without any further indications. The temperature can only be estimated by means of the paint colouring and the surface warpage.
IMPORTANT:
Do not use thermo crayons. Not suitable for workshop operation because the paint runs too quickly.
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