What Is A 4g Weld? For a welding certification, the number refers to the welding position and the letter refers to the type of joint. … 4G commonly refers to plate welding. Position four is overhead, and G is a groove joint. So a 4G certification is for overhead groove joint welding. What is a
What Is Horizontal Position In Welding? marine. The welding position in which the weld is on the upper side of an approximately horizontal surface and against an approximately vertical surface. What is vertical position in welding? In vertical position welding, the axis of the weld is approximately vertical. When welding is done on a vertical