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RISS 인기검색어
- 검색키워드
- 저자 : N. Ikram (검색결과 3 건)
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- 유료
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Design of an induction system for induction assisted alternating current gas metal arc welding
Ikram, A.,Arif, N.,Chung, H. Elsevier 2016 Journal of materials processing technology Vol.231 No.-
<P>Recent work on the low heat input and high deposition rate welding process of pulsed alternating current gas metal arc welding (AC-GMAW) has paved the way for the implementation of a cost effective solution for thick plate welding. Intense plasma jets are achieved through a high current and high electrode negative (EN) ratio based pulsed AC-GMAW, which has high negative peak currents in the EN region of the pulse. A distinct arc behavior results in high arc center temperatures and finger penetration, whereas the weak surrounding arc results in a lack of fusion on the joint sides for material thicknesses above 8 mm. The controlled induction pre-heating of the joint sides up to the desired depth can help in overcoming this problem. Numerical simulations of the induction source were performed using temperature-dependent material properties to find the optimal induction heating parameters that will result in the desired penetration depth and temperature. Experiments were conducted on a scaled-down induction system to verify the simulation model. Reasonable results were observed, confirming the proposed methodology. A full-scale induction power system needs to be implemented together with the AC-GMAW process to experimentally verify the application of the induction-assisted alternating current gas metal arc welding (IA-ACGMAW) system to thick plate welding, especially to thermally treated high-strength steels. (C) 2015 Elsevier B.V. All rights reserved.</P>
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Bashir, A.,Ikram, M.,Kumar, R.,Lisboa-Filho, P.N.,Thakur, P. Elsevier 2010 Materials science and engineering B. Advanced Func Vol.172 No.3
We present the structural, electronic structure and magnetic studies of Ni doped SmFeO<SUB>3</SUB>. The X-ray diffraction (XRD) studies confirm the single phase nature of the samples having orthorhombic Pbnm structure and the unit-cell volume is decreasing with the increase of Ni concentration. X-ray absorption spectroscopy (XAS) studies on O K, Fe L<SUB>3,2</SUB>, Ni L<SUB>3,2</SUB> and Sm M<SUB>5,4</SUB> edges of SmFe<SUB>1-x</SUB>Ni<SUB>x</SUB>O<SUB>3</SUB> (x@?0.5) samples along with the reference compounds revealed the homo-valence state of Fe and Ni in these materials. From magnetization studies it has been observed the materials exhibit ferromagnetic and antiferromagnetic sub-lattices, which are strongly dependent on the thermo-magnetic state of the system.
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Investigation of half metallicity in Fe doped CdSe and Co doped CdSe materials
Suneela Arif,B. Amin,Iftikhar Ahmad,M. Maqbool,R. Ahmad,M. Haneef,N. Ikram 한국물리학회 2012 Current Applied Physics Vol.12 No.1
The objective of the present work is to evaluate half metallicity and spin dependent transport properties of iron doped CdSe and cobalt doped CdSe compounds. The spin-polarized band structures (semiconductor in one spin state and conductor in the other spin state) predict that Cd0.875Fe0.125Se and Cd0.875Co0.125Se are half metals. The calculated crystal filed splitting energy show larger energy gap between eg and t2g for Fe than Co doped CdSe compound. Furthermore, magnetization, exchange coupling and band-gap increase with decrease in the lattice constant. Overall, Cd0.875Fe0.125Se and Cd0.875Co0.125Se in the zinc-blend phase show half-metallic ferromagnetic nature and are expected to be potential materials for spintronic devices.
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