Which type of welding utilizes a high current and pressure to fuse metals?

The chosen answer, Squeeze-Type Resistant Spot Welding, is the correct type that uses a high current and pressure to fuse metals, particularly in automotive manufacturing and assembly processes. This method involves applying electrical resistance to create heat at the interface of the metals, fusing them together while simultaneously using a mechanical pressure to encourage a strong bond. It's suitable for joining thin sheets of metal and is widely employed in mass production due to its efficiency and speed.

In contrast, the other welding types listed operate under different principles. Arc welding relies on an electric arc generated between an electrode and the base materials to melt and join metals, but it does not inherently require additional mechanical pressure like resistance spot welding does. Gas welding uses a flame produced by burning a mixture of fuel gas and oxygen to melt the edges of the metals being joined, without relying on high current or pressure. TIG welding, or Tungsten Inert Gas welding, employs a non-consumable tungsten electrode to produce the arc and uses inert gas to protect the weld area from contamination; however, like arc welding, it does not utilize high pressure in the same way as the squeeze-type resistant spot welding does.

This context frames Squeeze-Type Resistant Spot Welding as distinct in its methodology, emphasizing the application of both