Submerged arc automatic welding:

Referred to as submerged arc welding, is a kind of arc welding method in which the arc burns under the flux layer, automatically initiates and controls the arc with the machine, and automatically completes the wire feed and arc movement

Welds commonly used for welding:

Due to the use of granular flux, submerged arc welding is generally only applicable to the plain welding position, other positions of the welding need to adopt special measures to ensure that the flux can cover the welding area, submerged arc automatic welding is mainly applicable to the welding of low carbon steel and alloy steel plate, is a common welding technology in large welding structure production.

Principle:

The arc between the welding wire and the welding piece causes the arc heat buried under the granular flux to melt the end of the welding wire and the base material and flux directly affected by the arc and partially vaporize. The gas vaporized by the metal and flux forms a closed cavity around the arc in which the arc burns.The cavity is surrounded by a slag film composed of slag, which not only keeps out the contact between air and arc, but also prevents arc light from radiating out.The wire melted by an arc falls in droplet form and mixes with the molten base metal to form a molten pool.The less dense slag floats on the molten pool. In addition to the mechanical protection of molten pool metal, slag also reacts with molten pool metal in the welding process, which affects the chemical composition of weld metal.The arc moves forward and the pool metal cools and crystallizes to form a weld.After the slag floating on the pool is cooled, the slag shell can continue to protect the welding seam at high temperature and avoid oxidation.