Arc welding fusion welding in the welding method. It is also in all kinds of welding methods most widely used welding method, which the simplest most common is use manual welding for welding electric arc welding, known as the manual arc welding, referred to as manual arc welding. Hand arc welding equipment is simple, convenient and flexible operation, strong adaptability. It is suitable for welding of all kinds of metal materials and all kinds of shapes and structures, especially suitable for the welding of the structure with complex shape, short welding seam or curved 2mm and various space position. The main defects of the hand arc welding is that the welding quality is not stable, the production efficiency is low, and the technical level of the operator is higher.