Welded carbon steel and low alloy steel core wire. Generally used as a low-carbon steel core wire. And fill plus manganese, silicon, chromium, nickel and other ingredients (see the national standard GB1300 a wire 77). One reason is that the use of low-carbon low carbon steel wire plastic. Wire drawing easier. On the other hand can reduce the reducing gas CO content. Reduce splashing or pores, and can increase the temperature of the weld metal solidification. Beneficial for overhead welding. Join other major alloying elements to ensure the overall mechanical properties of the weld. While welding performance and remove impurities, also have a role.