... .On-time delivery and perfect after sale service SJ101 is fluoride alkali type sintered flux; alkalinity is 1.8,spherical particles,granularity ... ,ships and so on.· ATTENTION : a.Before welding,the welding flux should be baked at the temperature from 300 to 350 ... impurities,such as rust,oil,moisture etc. SUBMERGED-ARC WELDING FLUX