Welded joints are connections made by fusing two or more pieces of metal together using heat. This process creates a strong bond, making welded joints essential in construction, manufacturing, and various engineering applications. Common welding methods include MIG, TIG, and arc welding, each suited for different materials and thicknesses. These joints can be classified into several types, such as butt joints, lap joints, and corner joints, depending on how the metal pieces are arranged. Proper design and execution of welded joints are crucial for ensuring structural integrity and durability in finished products.