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Condensation
Condensation The influence of humidity and temperature of the atmosphere may change the conditions of fabrication during different seasons signifi cantly. As much as humidity condenses on a cool glass of beer, this can happen on Aluminium surfaces as well. The difference of temperature between air and metal and the humidity are the responsible parameters. The following table shows the dew points at different temperature differences and humidity in some examples. MIG WELD offers a 
dew point calculator for online calculation. MIG WELD also offers an 
instrument which measures the temperature of air and metal as well as humidity and gives a clear readout about the possibility of welding.
| (TAir - TMetal) | Relative humidity | (TAir - TMetal) | Relative humidity |
|---|---|---|---|
| °C | % | °C | % |
| 0 | 100 | 12 | 44 |
| 1 | 93 | 13 | 41 |
| 2 | 87 | 14 | 38 |
| 3 | 81 | 15 | 36 |
| 4 | 75 | 16 | 34 |
| 5* | 70* | 18 | 30 |
| 6 | 66 | 20 | 26 |
| 7 | 22 | 22 | 23 |
| 8 | 57 | 24 | 21 |
| 9 | 53 | 26 | 18 |
| 10 | 50 | 28 | 16 |
| 11 | 48 | 30 | 14 |
* Example: At a relative humidity of 70% water condenses on a metal surface with a temperature difference of 5° Celsius only. Condensation must be avoided in any case.