Fuse together is a term used to describe the process of joining two or more objects together. Welding, coalescing, soldering, and melding are all methods of fusing together. Welding is a process of joining two pieces of metal together by melting them and then cooling them so that they form a single piece. Coalescing is a process of combining two or more substances into one. Soldering is a process of joining two metals together by melting a filler material between them. Melding is a process of combining two or more materials together to form a single entity. All of these processes are used to fuse together two or more objects.