Which of the following is NOT one of the three types of Fusion Welding?

Fusion welding is a process that joins materials, typically metals, by melting them together. There are three main types of fusion welding techniques, each utilizing different methods to generate the heat needed for welding. Electric Arc welding, Gas/Oxy-fuel welding, and Thermit welding are widely recognized methods that involve melting and joining materials at the fusion point.

Electric Arc welding employs an electric arc to generate heat for the melting process. Gas/Oxy-fuel welding uses a flame produced by burning gas, typically acetylene, in oxygen to create the necessary heat for fusion. Thermit welding involves a chemical reaction between aluminum and oxide of a metal, producing molten metal that fuses the components together.

Laser welding, while an effective welding technique, does not fall under the conventional categories of fusion welding that primarily involve the melting of materials via heat generation from either an arc, flame, or chemical reaction. Thus, it is regarded as a distinct method rather than one of the main types of fusion welding. This distinction makes it the correct answer to identify which option is not one of the three conventional types of fusion welding.