Welding wire can be divided into solid core welding wire and flux cored welding wire according to its structure.
Solid core welding wire is mostly cold drawn steel wire; while flux cored welding wire is made by longitudinally folding thin steel strip and adding powder, and then drawing. Solid core welding wire has a long history of use and is the main welding wire currently used; the use of flux wire welding wire is much later than that of solid core welding wire, but due to its series of advantages, it is used more and more in production.
The welding wire used for welding can be divided into two categories according to its protection method: one is that the welding wire only plays the role of filler metal and electrical conductivity during welding, and the welding process must rely on flux protection or gas protection, such as submerged arc welding, CO2 gas. Solid wire used in shielded welding and part of flux-cored wire used in CO2 gas shielded welding; another type of wire does not require the protection of external gas or flux during the welding process, and only relies on the alloying elements of the wire itself and the reaction at high temperature To prevent the intrusion of oxygen, nitrogen and other gases in the air, and to adjust the metal composition of the weld, this type of welding wire is called self-shielded flux-cored welding wire, which is a promising new type of welding wire. Domestic production has begun, but it is not widely used.
