Flux-cored welding wire is suitable to work in all positions with stable arc less splash, less welding smoke, shaped good appearance, high welding efficiency, inherent quality stable and reliable, good mechanical property of deposited metal. Suitable for welding key structure steel made of low carbon steel and low-allow steel, specially suitable for welding some key structures like shipbuilding, mechanical manufacture, pressure vessels, boilers, petroleum machinery, chemical machinery, hoisting machinery