| Welding and soldering on refrigeration systems |
| Before welding on vehicles (close to air-conditioner parts), the refrigerant must be extracted by means of suction, and any remains must be eliminated by blowing with nitrogen. |
| The decomposition products of the refrigerant formed by the effect of heat are not only toxic, but are also extremely corrosive and may attack the piping and other parts of the installation. This refers primarily to hydrogen fluoride. |
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