Which of the following is NOT a type of welding?

Grinding is not a type of welding; rather, it is a machining process used to smooth or finish surfaces of materials. In welding, the aim is to join materials together using heat and, sometimes, additional filler material to create a solid bond.

Stick welding, also known as Shielded Metal Arc Welding (SMAW), utilizes a coated electrode that melts to provide the filler material for welding. TIG (Tungsten Inert Gas) welding, or GTAW, employs a non-consumable tungsten electrode to produce the weld, while also using an inert gas (like argon) to shield the weld area from contamination. Spot welding is a resistance welding process that joins pieces of metal by applying heat and pressure to specific points.

Understanding the distinction between these processes is essential for recognizing various methods of fabrication and joining materials in agriculture and other fields.