A welding machine is a powerful industrial tool used to join two or more metal pieces together by generating heat through electric current, gas, or other energy sources. It melts the edges of the materials and, with or without filler metal, creates a strong and permanent bond. Welding machines are widely used in construction, shipbuilding, fabrication, automotive repair, and general metalwork. They are available in different types, including arc welding, MIG welding, TIG welding, and spot welding machines, each designed for specific welding applications and materials.