Pipeline steel X80 and forging steel LF2 are commonly taken by SMAW as base welding,and self-shielded welding as filler welding and cosmetic welding in the construction of the second line of west-east gas station.Three types of self-shielded welding wires were used in different composition and intensity to do the welding work.The tensile test,bending test,low temperature impact test and electrochemical test are taken on the welds to show the mechanical properties and corrosion resistance.According to the ob...