- #1
DTM
- 73
- 9
You hear it over and over again, that solder or braze alloy will flow towards the heat. Another way of saying this is it flows towards hotter metal and away from colder metal. I've done enough soldering to see that it certainly appears to be true. But I've never heard, nor have I found, a good fundamental explanation of why liquid solder or braze alloy flows towards the heat. What force is causing this motion? Any thoughts?