In gravity welding, one of the pieces to be joined is positioned above the other, and a small amount of molten metal (weld pool) is created at the joint. As the weld pool solidifies, gravity helps to pull the molten metal down into the joint, creating a strong bond between the two pieces.
The core of the system is a simple mechanical device. A weighted electrode holder slides down a fixed trajectory as the electrode melts. Because the electrode is consumed at a constant rate, gravity ensures a steady speed and consistent bead geometry. gravity welding