... ;it shows good welding performances :stable arc,a fine appearance of weld,slag easy to remove,and has good gas porosity-resistibility ... ,bridges,oilcans,ships and so on. · ATTENTION : a.Before welding,the welding flux should be baked at the temperature from 300 to 350 ... hours .b.Before welding,the weld metal must be cleared away impurities,such as rust,oil,moisture etc. SUBMERGED-ARC WELDING FLUX SJ501