The Paton Welding Journal, 2013, №04



2013 №04 (01)

2013 №04 (03)

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The Paton Welding Journal, 2013, #4, 8-14 pages  

WELDABILITY OF SPARSELY-ALLOYED STEELS 06GBD AND 06G2B

V.D. POZNYAKOV, S.L. ZHDANOV, A.A. MAKSIMENKO, A.G. SINEOK and A.M. GERASIMENKO

E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
 
 
Abstract
The aim of this work was the investigation of weldability of sparsely-alloyed niobium-containing steels 06GBD and 06G2B with the yield strength of more than 390 MPa, and also evaluation of properties of their welded joints at different technological welding processes as-applied to manufacture of unique building structures (bridges, tanks of 50,000—70,000 m³ capacity, blast furnaces). Basing on the analysis of thermokinetic diagram obtained using rapid-response dilatometer and results of tests of model thermocycled specimens the correlation at the cooling rates w6/5 in the range of 1.3—70 °C/s between structure of metal of heat-affected zone of welded joints and their properties was established. Considering the results of tests on delayed fracture of welded joints, the range of admitted energy inputs of welding was established providing their high cold resistance and resistance to cold crack formation. The offered welding conditions and welding consumables found their application in manufacture of steels 06GBD and 06G2B welded structures of oil tanks of large capacity and bridges. 8 Ref., 5 Tables, 8 Figures.
 
 
Keywords: sparsely-alloyed steel, weldability, thermokinetic diagram, cooling rate, structure, simulated metal of heat-affected zone, cold cracks, technological sample
 
 
Received:                07.02.13
Published:               28.04.13
 
 
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