Indeed but (a) as has been said, the joint should really not be either electrically or mechanically reliant on the solder and (b) I think that solders used for electrical/electronic work usually have a melting point around 190°C. By the time a conductor has got that hot, one has bigger things (like insulation) to worry about than any soldered joints!Aren't soldered joints susceptible to the heat that may be generated under fault conditions?
Kind Regards, John