Fusion welding is any welding process in which melting is used to connect two objects made of similar materials. For example, to use fusion welding to connect two wires, the ends of the wires are heated, and metal solder is melted with a blowtorch to hold the wires together.
Fusion welding works well for connecting metal and plastic items. The manufacturing process uses several types of fusion welding to connect materials. Arc welding involves creating an arc of electricity to heat materials to their melting point. Oxy-fuel welding uses fuel gases combined with pure oxygen to increase the heat. Electric resistance welding, a type of fusion welding used for spots and seams, uses a combination of electrical distance and force over a period of time to melt materials together.