The basic method of fusion welding that uses the "squeeze-and-heat" process is _________ welding.

Resistance welding is the correct choice because it is characterized by its unique "squeeze-and-heat" process, which involves applying pressure to the workpieces while passing an electric current through them. This current generates heat at the interface of the materials being joined, leading to fusion at the contact points. The process is particularly effective for joining sheet metal and is widely used in various manufacturing applications.

In contrast, arc welding utilizes an electric arc generated between an electrode and the workpiece to produce heat for fusion, while MIG (Metal Inert Gas) and TIG (Tungsten Inert Gas) welding involve feeding a filler material into the weld pool created by the heat from an arc. These methods do not rely on the squeeze-and-heat mechanism, focusing instead on continuous heating and filler materials to achieve a strong joint. This distinction is essential in understanding the specific processes and applications of each welding technique.