Welding is a process that joins two or more pieces of metal by melting them together.

This is typically done using heat and pressure, often with the addition of filler metal.

Different Welding techniques are:

• Shielded Metal Arc Welding. (SMAW or Stick Welding)
• Gas Metal Arc Welding. ( GMAW or MIG Welding)
• Gas Tungsten Arc Welding. (GTAW or TIG Welding)
• Flux-Cored Arc Welding. (FCAW)
  

Fabrication is a broader term that encompasses the entire process of creating a metal product. It involves shaping, cutting, and joining metal components to form a final product.

Other fabrication include:- Cutting, Forming, Machining, Assembly.