Avtomaticheskaya Svarka (Automatic Welding), #2, 2016, pp. 48-53
Analysis of applicability of slag crust in production of agglomerated fluxes
, L.I. Fajnberg1
, A.A. Rybakov1
and A.V. Netyaga2
E.O. Paton Electric Welding Institute, NASU. 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: firstname.lastname@example.org
NTUU «Kiev Polytechnic Institute». 37 Pobeda Ave., 03056, Kiev, Ukraine
The use of wastes of fused and agglomerated fluxes is an urgent task. But as-applied to agglomerated fluxes the data on the effective use of slag crust are absent in the literature. In this work the analysis of possibility of using a slag crust of agglomerated fluxes for production of fluxes, providing the quality formation and high mechanical properties of weld metal at high-speed multi-arc welding of cold-resistant low-alloy steels was carried out. The comparative investigation of welding and technological properties of original flux OK 10.74 and experimental fluxes based on the crushed slag crust in single- and four-arc welding was carried out. Using the method of spectral analysis the chemical composition of weld metal was studied. The method of optical metallography was used to investigate the distribution of nonmetallic inclusions in them and characteristics of microstructure. The impact toughness of weld metal was determined by tests on impact bending. It was established that the flux, produced by the method of agglomeration with addition of 5 wt.% of metallic manganese into the composition of charge, was close to original flux OK 10.74 according to all the investigated indicators, and as to the level of impact toughness met the requirements for welded joints of cold-resistant gas-pipeline steel up to strength category X80 inclusive. The results represent interest to the consumers of flux from the point of view of improving the efficiency of its use in multi-arc welding of large-diameter pipes. 10 Ref., 4 Tables, 3 Figures.
submerged arc welding, agglomeration, regeneration, nonmetallic inclusions, microstructure, impact toughness of weld metal
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