... flux; alkalinity is 0.5-0.8,spherical particles , granularity is 10-60mesh;it shows good welding performances :stable arc ... wire,e.g.H10Mn2,etc,it is used for welding steel structures,such as boilers,pressure vessels,bridges ... and so on. · ATTENTION : a.Before welding,the welding flux should be baked at the temperature from 300 ... to 350°C for 1-2 hours .b.Before welding,the weld metal must be ...