Coated with a drug skin for manual arc welding with consumable electrode called welding electrode. It consists of coating and welding core to compose.
There are the basic requirements of electrode.
Arc should be easily ignited, during welding arc burn smoothly, then arc is easy.
Coating should be uniform melted, without blocks shedding phenomenon. Drug skin melting rate should be slightly slower than the core wire melting speed, welding electrode melting ends can form a flared sleeve, in favor of the transition metal droplets and cause a protective atmosphere. Welding process should not have too much or smoke too much. Ensure that deposited metal has a certain degree of crack resistance, the desired mechanical properties and chemical composition. The weld forming is normal, welding slag easy to remove.
Ray detection for weld should not be less than GB3323-87 "steel fusion welded butt joints radiography inspection and classification" under the stage Ⅱ standard.
