Principleof wave and reflow solderng

[aruna1]

guys I've beng searching internet long time to find the principle used behind wave and reflow soldering methods,but all i get is about its procedure.

can anyone tell me what is the principles behind these two methods
thanks

 

[MATLABdude]

The metal solder melts / reflows and forms an electrical connection between the components' leads and the PCB?

If you really, really, want a principle, maybe capillary forces and/or surface minimization involved in the wetting of the metal by the solder (or maybe, the heated flux allowing for wetting). I'm not a materials chemist.

 

[aruna1]

I'm not sure,question was "what is the principle used in following soldering methods?"