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Influences of flux-cored arc welding consumables on dynamic fracture toughness (J1d) of armour grade Q&T steel joints
Authors:G MAGUDEESWARAN  S SATHYANARAYANAN  G MADHUSUDHAN REDDY  V BALASUBRAMANIAN  A MOITRA  S VENUGOPAL  G SASIKALA
Affiliation:Metal Joining Research Center (MJRC), Sri Ramakrishna Engineering College, NGGO Colony –Post, Coimbatore –641022, Tamil Nadu, India;, Materials Mechanics Section, Indira Gandhi Center for Atomic Research (IGCAR), Kalpakkam –603 102, Tamil Nadu, India;, Metal Joining Section, Defence Metallurgical Research Laboratory (DMRL), Kanchanbagh (P.O), Hyderabad –560 058, Andhra Pradesh, India;, Centre for Materials Joining &Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar –608 002, Tamil Nadu, India
Abstract:Quenched and tempered (Q&T) steels are prone to hydrogen-induced cracking in the HAZ after welding. Austenitic stainless steel (ASS) welding consumables are traditionally used for welding of high hardness Q&T steels as they have higher solubility for hydrogen. The use of stainless steel consumables for a non-stainless steel base metal is not economical. In recent years, the developments of low hydrogen ferritic steel (LHF) consumables that contain no hygroscopic compounds are utilized for welding of Q&T steels The use of ASS and LHF consumables for armour grade Q&T steel will lead to formation of distinct microstructures in their respective welds. This microstructural heterogeneity will have a drastic influence in the dynamic fracture toughness of the armour grade Q&T steel welds. Hence, an attempt was made in this paper to study the influence of flux-cored arc welding consumables on dynamic fracture toughness ( J 1d) of armour grade Q&T steel joints. The flux-cored arc welding consumables have a significant effect on the dynamic fracture toughness of the armour grade Q&T steel welds. The joints fabricated using ASS flux-cored wires showed superior J 1d values than the joints fabricated using LHF consumables and the base metal.
Keywords:dynamic fracture toughness  quenched and tempered steel  welding consumables
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