... -60meshes), it can used with AC and DC. When DC welding ,the welding wire should connected to the positive electrode, the maximum ... as oil and gas pipes, tanks and cylinders of automatic submerged arc welding.Cautions:1. Fluxes to be baked for two hours ... ;2. Removal of rust, oil, dirt, water, impurities etc in welding-areas. Solder composition (%)SiO2+TiO2CaO+MgOAl2O3+MnOCaF2SP25-3520-3020-355 ...