With a thin steel strip coils into a round or shaped steel tubing, filled with a certain composition of the powder, made by the pull slit flux cored Welding Wire, or steel pipe to fill the powder pull made of seamless flux cored wire (see photo). Welding with this wire deposited high efficiency, good adaptability on the steel, the trial period is short, and therefore its use and the use of expanding. This wire for CO2 gas shielded welding, submerged arc and electroslag welding. The powder composition is generally in the flux-cored wire electrode drug skin. Containing slag, made the composition of gas and stable arc flux cored wire welding without shielding gas, said the self-shielded flux cored wire, suitable for large welded structure works. Asked the city gas shielded flux cored wire had already started to develop as early as in the early 1950s, but by 1957, is widely used commercially. This method can be said from the submerged arc welding and CO2Welding Electrode(referring to solid), the advantages of a combination of flux wrapped in wire and by external CO2 gas protection allows welding to produce a soft and stable arc and low spatter of its features. Early stage of development, only a large wire diameter wire (2.0-4.0mm), for the material of the workpiece flat welding and horizontal welding. Small wire diameter wire up to 1972 began to develop only greatly expanded the areas of flux cored wire.