1.3 Machining Properties
MACHINING PROPERTIES
| Properties of aluminum compared with steel | Effects |
|---|---|
| Aluminum 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 procedures 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. |
| Microstructural change between 200°C and 250°C. | Elongation characteristics and thus plasticity are improved. |
| Strength is reduced.
IMPORTANT:
No heat treatment when working on the vehicle structure! Temperature cannot be monitored to sufficiently exact levels in garages.
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| Aluminum shows no annealing colors. | 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 coloring and the surface warpage.
IMPORTANT:
Do not use thermal applicators. Not suitable for garage use because the paint runs too quickly.
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