Seam welding is a process used to join two pieces of metal together by applying heat and pressure along a continuous line. This technique typically uses an electric current to create a weld at the interface of the metals, forming a strong bond. It is commonly employed in manufacturing processes for items like automobile bodies and metal containers. The equipment used in seam welding consists of two electrodes that apply pressure and deliver electrical current to the metal surfaces. This method is efficient for creating leak-proof seams and is often used in industries where durability and strength are essential, such as in the production of industrial machinery and appliances.