Nov 02, 2012 · Fusing is a little different. This technique requires the use of pure metals, pure or “fine” silver and 24Kt gold, not alloys. No solder is needed to join (fuse) these two metals to themselves. This time the torch is used to quickly melt the metal, and it joins (fuses) as it cools. By using a butane torch, you can heat your pieces of metal until they are almost but not quite melted. Once they reach this flashpoint, you can easily fuse the pieces together.