ROLE OF WELDING FLUX IN FORMATION OF WELD METAL DURING ARC WELDING OF HIGH-STRENGTH LOW-ALLOY STEELS

摘要

Analysis of research results in area of welding metallurgy of high-strength low-alloy (HSLA) steels showed a change of role of welding flux in providing of weld metal quality indices. It is concluded that current welding fluxes should actively participate in processes of weld pool refining, regulation of metallurgical processes of formation of non-metallic inclusions (NMI), having certain composition, morphology and nature of distribution in solid solution, in order to provide necessary structural composition of weld metal and complex of its mechanical properties in welding of HSLA steels. Existing industrial experience allowed the authors determining that agglomerated fluxes have-significant advantage in producing the welds with predicted complex of NMI. These fluxes are characterized by high technological flexibility due to regulation of their oxidizing ability, possibility to effect formation of NMI of certain composition and morphology in the welds. Welded joints, produced using these type fluxes, receive the complex of mechanical properties at the level of base metal values.