When it comes to connecting metals, welding is a method that guarantees continuity. While bolting or physically attaching two metals can create a strong structure, this connection is usually discontinuous, and there may even be an oxide insulating film present on the surface of the metal that hinders physical contact. Mechanical connections are also prone to oxidation and increased resistance from continued wear and tear. Vibrations and other forms of mechanical force can also loosen the joint over time. Welding, on the other hand, eradicates these issues entirely. The welded joint doesn't move relative to each other, remains free from oxidization, and ensures uninterrupted conduction. Soldering, meanwhile, involves melting both metals to create a fusion process. During this process, the molten solder dissolves some of the metal in contact with it. The surface of the welded metal may also acquire a thin film of oxide that can't dissolve. To remedy this problem, the use of flux is necessary to remove the oxide film off the surface.