Submerged arc welding is a welding method using the arc as the heat source. During submerged arc welding, the arc burns under the fusible flux, the arc is not exposed, and the metal electrode used is the continuous feeding smooth welding wire.Due to its large penetration and high mechanization, submerged arc welding is suitable for long weld welding of medium and heavy plate structure. It is one of the most commonly used welding methods in welding production.