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Boian Alexandrov

  • Research Associate Professor, Materials Science Engineering
  • EJTC
    Room 128
    Columbus, OH 43221
  • 614-292-1735

About

Dr. Boian T. Alexandrov is a Research Associate Professor in the Welding Engineering Program and Director of the Center for Weldability Evaluation (cwe.engineering.osu.edu) at The Ohio State University. He earned his M.Sc. degree in Materials Science and Engineering and Ph.D. in Welding Engineering from the Technical University of Sofia (TUS) in Bulgaria. Prior to joining Ohio State in 2003, he worked as an Associate Professor at the Department of Materials Science and Engineering of TUS.

He held an NSF-NATO fellowship at the Welding Engineering Program of Ohio State, and fellowships at the University of Cambridge in UK, Otto-von-Guericke University in Magdeburg Germany, University College of Dublin in Ireland, the Institute of Welding and Quality in Lisbon Portugal, and the Welding Research Institute in Bratislava Slovakia.

His primary research interests are in the physical metallurgy of welding, focusing on a better understanding of weld phenomena through simulation, phase transformation analysis, advanced characterization, and on evaluation of weldability and service performance of welds in advanced alloys. He has contributed towards clarification of metallurgical phenomena related to major weldability problems experienced in the oil and gas, petrochemical, and power generation sectors. His research has been supported by US federal institutions and by more than forty companies from the US, UK, Canada, Germany, France, Sweden, Belgium, Austria, Brazil, Japan, and South Korea.

Dr. Alexandrov is also a Fellow of ASM International (2019) and AWS (2015). He received the AWS Warren F. Savage Memorial Award (2013) and the William Spraragen Memorial Award (2012), the Ohio State College of Engineering Lumley Research Award (2017, 2012), the Elmer L. Hann Award of the Society of Naval Architects and Marine Engineers (2011), and ASM International Metallographic Society Awards in Electron Microscopy (2018, 2010).

He is a member of AWS, ASM International, NACE International, ASME, and FAS. He serves at the Technical Papers Committee of AWS and the ASM Programming Committee, is an active member of Commissions II and IX of the International Institute of Welding (IIW), and of the American Council of IIW. He is also a past Chair and Vice-Chair, and a current member of the Joining Technology Committee of ASM International. He has served as a principal reviewer and/or reviewer for Welding Journal, Welding in the World, Metallurgical Transactions, Science and Technology of Welding and Joining, and Journal of Nuclear Materials.

Center for Weldability Evaluation

Honors

  • June, 2019

    Adams Memorial Membership Award.

  • January, 2019

    Fellow of the American Society for Metals International.

  • November, 2018

    First Place Poster Award, Professional Category, AWS.

  • October, 2018

    Second Place Award, Scanning Electron Microscopy.

  • January, 2017

    Lumley Research Award.

  • November, 2015

    Fellow of the American Welding Society.

  • November, 2013

    Warren F. Savage Memorial Award.

  • November, 2012

    William Spraragen Memorial Award.

  • May, 2012

    Lumley Research Award.

  • January, 2011

    Elmer L. Hann Award.

  • February, 2010

    First Place Award in Scanning Electron Microscopy. College of the Atlantic.

  • January, 2010

    Third Place DuBose-Crouse Award for Unique, Unusual, and New Techniques in Microscopy. College of the Atlantic.

  • October, 2003-
    September, 2004

    NSF - NATO Fellowship, Welding Engineering Program, The Ohio State University.

  • May, 2003-
    June, 2003

    Scholarship , Institute of Joining and Beam Technology, Otto von Guericke University, Germany.

  • July, 2001-
    August, 2001

    Clare College Scholarship, Cambridge Colleges Hospitality Scheme, Cambridge, UK.

  • January, 1994-
    January, 1998

    Institute of Welding and Quality, Lisbon, Portugal / EU Program Tempus, five short term Fellowships.

  • October, 1992-
    January, 1993

    Scholarship, University College Dublin, Ireland / EU Program TEMPUS.

  • October, 1989-
    December, 1989

    Scholarship, Dept. Physical Metallurgy, Welding Research Institute Bratislava.

  • October, 1988-
    November, 1988

    Scholarship, Dept. Physical Metallurgy, Welding Research Institute Bratislava, Slovakia.

  • June, 2019

    Fellow ASM.

Journal Articles

2019

  • Kuper, M.W.; Alexandrov, B.T., 2019, "Retention of Delta Ferrite in the Heat-Affected Zone of Grade 91 Steel Dissimilar Metal Welds." METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 50A, no. 6, 2732-2747 - 2732-2747.
  • Wang, H.; Alexandrov, B.T.; Przybylowicz, E., 2019, "Experimental and numerical modeling study of solidification cracking in Alloy 52M filler metal in the cast pin tear test." Welding in the World 63, no. 3, 913-924 - 913-924.
  • Frei, J.; Alexandrov, B.T.; Rethmeier, M., 2019, "Low heat input gas metal arc welding for dissimilar metal weld overlays part III: hydrogen-assisted cracking susceptibility." Welding in the World 63, no. 3, 591-598 - 591-598.

2018

  • Stone, D.J.; Alexandrov, B.T.; Penso, J.A., 2018, "Alloy composition and critical temperatures in type 410 steel welds." Welding Journal 97, no. 10, 286s-300s - 286s-300s.
  • Shapiro, A.E.; Landis, A.; Orr, A.; Wieneke, M. et al., 2018, "Testing Options for Silver-Free Brazing Alloys." WELDING JOURNAL 97, no. 5, 56-60 - 56-60.
  • Frei, J.; Alexandrov, B.T.; Rethmeier, M., 2018, "Low heat input gas metal arc welding for dissimilar metal weld overlays part II: the transition zone." Welding in the World 62, no. 2, 317-324 - 317-324.

2017

  • Fink, C.; Alexandrov, B.T., 2017, "Effect of post-weld heat treatment on fusion boundary microstructure in dissimilar metal welds for subsea service." Materialpruefung/Materials Testing 59, no. 6, 547-554 - 547-554.
  • Riggs, B.; Benatar, A.; Alexandrov, B.T.; Xu, R., 2017, "Experimental Validation of Damage Zone Models for Lap-Shear Brazed Joints Using DIC." WELDING JOURNAL 96, no. 11, 421S-428S - 421S-428S.
  • Riggs, B.; Alexandrov, B.; Benatar, A.; Xu, R., 2017, "Metallurgical characterisations of CMSX-4 vacuum-brazed with BNi-2 and BNi-9." Science and Technology of Welding and Joining 22, no. 3, 227-235 - 227-235.

2016

  • Frei, J.; Alexandrov, B.T.; Rethmeier, M., 2016, "Low heat input gas metal arc welding for dissimilar metal weld overlays part I: the heat-affected zone." Welding in the World 60, no. 3, 459-473 - 459-473.
  • Riggs, B.B.; Alexandrov, B.B.; Benatar, A.A.; Xu, R.R., 2016, "Thermodynamic and kinetic simulations of high temperature brazing: microstructure evolution in CMSX-4 joints." Science and Technology of Welding and Joining 1-10 - 1-10.

2015

  • Duffey, M.J.; Marchal, J.T.; Loney, M.R.; Alexandrov, B.T. et al., 2015, "Evaluation of New Silver-Free Brazing Filler Metals." WELDING JOURNAL 94, no. 3, 40-46 - 40-46.
  • Marchal, J.T.; Duffey, M.J.; Loney, M.R.; Alexandrov, B.T. et al., 2015, "Silver-free filler metals meet strength requirements in brazed joints." Welding Journal 94, no. 11, 62-66 - 62-66.
  • Mendoza, I.; Villalobos, D.; Alexandrov, B.T., 2015, "Crack propagation of Ti alloy via adiabatic shear bands." Materials Science and Engineering A 645, 306-310 - 306-310.

2013

  • Alexandrov, B.T.; Lippold, J.C., 2013, "Use of the cast pin tear test to study solidification cracking." Welding in the World 57, no. 5, 635-648 - 635-648.
  • Alexandrov, B.T.; Lippold, J.C.; Sowards, J.W.; Hope, A.T. et al., 2013, "Fusion boundary microstructure evolution associated with embrittlement of Ni-base alloy overlays applied to carbon steel." Welding in the World 57, no. 1, 39-53 - 39-53.

2012

  • 2012, "Phase Transformations In Creep Strength Enhanced Ferritic Steel Welds." Machines, Technologies, Materials 6, no. 4,
  • Yue, X.; Lippold, J.C.; Alexandrov, B.T.; Babu, S.S., 2012, "Continuous Cooling Transformation Behavior in the CGHAZ of Naval Steels." WELDING JOURNAL 91, no. 3, 67S-75S - 67S-75S.
  • Lolla, T.; Cola, G.; Narayanan, B.; Alexandrov, B. et al., 2012, "Comment on 'Development of rapid heating and cooling ( flash processing) process to produce advanced high strength steel microstructures' by Lolla et al., with a response from the authors Response." MATERIALS SCIENCE AND TECHNOLOGY 28, no. 1, 126-127 - 126-127.

2011

  • Alexandrov B.T., Hope A.T., Sowards J.W., Lippold J.C., and McCracken S.S., 2011, "Weldability Studies of High-Cr, Ni-base Filler Metals for Power Generation Applications." Welding in the World 55, no. 3/4, 65-76 - 65-76.
  • Sowards,J,W; Alexandrov,B,T; Lippold,John; Frankel,G,S, 2011, "Weldability of a New Ni-Cu Welding Consumable for Joining Austenitic Stainless Steels." HOT CRACKING PHENOMENA IN WELDS III 393-413 - 393-413.
  • Alexandrov, B.T.; Hope, A.T.; Sowards, J.W.; Lippold, J.C. et al., 2011, "Weldability studies of high-Cr, Ni-Base filler metals for power generation applications." Welding in the World 55, no. 3-4, 65-76 - 65-76.
  • Lolla, T.; Cola, G.; Narayanan, B.; Alexandrov, B. et al., 2011, "Development of rapid heating and cooling (flash processing) process to produce advanced high strength steel microstructures." Materials Science and Technology 27, no. 5, 863-875 - 863-875.
  • 2011, "Alternatives for Joining Stainless Steel to Reduce Cr(VI) Emissions and Occupational Exposures." JOURNAL OF SHIP PRODUCTION AND DESIGN 27, no. 2,

2008

  • Siefert, J.; Alexandrov, B.; Lippold, J.; Sanders, J. et al., 2008, "Examination of phase transformations during PWHT of steel P91." Welding in the World 52, no. SPEC. ISS., 75-80 - 75-80.

2007

  • Alexandrov B. T. and J. C. Lippold, 2007, "Single Sensor Differential Thermal Analysis of Phase Transformations and Structural Changes during Welding and Postweld Heat Treatment." Welding in the World 51, no. 11/12, 48-59 - 48-59.

2006

  • Alexandrov, B.; Theis, K.; Streitenberger, M.; Herold, H. et al., 2006, "Cold cracking in weldments of steel S 690 QT." Welding Research Abroad 52, no. 8, 6-15 - 6-15.
  • Alexandrov, B.T.; Lippold, J.C., 2006, "In-situ weld metal continuous cooling transformation diagrams." Welding in the World 50, no. 9-10, 65-74 - 65-74.

2005

  • Alexandrov, B.; Thels, K.; Streitenberger, M.; Herold, H. et al., 2005, "Cold cracking in weldments of steel S 690 QT." Welding in the World 49, no. 5-6, 64-73 - 64-73.

2004

  • Alexandrov, B.T., 2004, "Hydrogen diffusion coefficient and modelling of hydrogen behaviour in welded joints of structural steels." Welding Research Abroad 50, no. 12, 47-55 - 47-55.

2003

  • 2003, "Applicability of Index for the Microstructural Inhomogeneity of Structural Steels." Journal of Materials Science and Technology 11, no. 1,

2002

  • 2002, "Evaluation of Susceptibility to Cold Cracking during Laser Beam Welding of High Strength Steels." Machine-building Technologies 51, no. 1,
  • 2002, "In-situ CCT Diagrams in HAZ of Low Alloy Structural Steels." Scientific News 9,
  • 2002, "In-situ Investigation of the Phase Transformations in Ferritic Weld Metal." Scientific News 9,
  • 2002, "Welding and Testing of Liquefied Gas Containers." Scientific News 9,

2000

  • 2000, "Hydrogen Behaviour and Testing Duration by the Methods SIV 19 HT and Implant Test." Machine-building 50, no. 2/3,

1993

  • Velkov, K.; Aleksandrov, B., 1993, "Equipment for examining kinetics of desorption of diffusible hydrogen from a welded joint." Welding International 7, no. 7, 557-559 - 557-559.

1992

  • 1992, "Device for Investigating the Kinetics of Diffusible Hydrogen Effusion from Welded Joints." Welding Production 64, no. 2,

1989

  • 1989, "Behaviour of Hydrogen in Heat Affected Zone during Welding of Steel 23G2SAF." Wiss. Z. Uniwersitat Rostock 38, no. 7,
  • 1989, "Procedure and Equipment for Controlled Electrolytic Charging with Hydrogen." Technical Ideas 42, no. 1,

Unknown

  • 31. Alexandrov, B.T.; Alexandrov, B.T., "Hydrogen Diffusion Coefficient and Modelling of Hydrogen Behavior in Welded Joints of Structural Steels." Welding in the World 47, no. 9/10,

Presentations

  • "Modeling of Hydrogen Behavior in Welded Joints and Evaluation of its Role for Cold Cracking." 2003, Presented at 7th Seminar Numerical Modeling of Weld Phenomena, IIW, TU Graz,
  • "Phase Transformations In Creep Strength Enhanced Ferritic Steel Weld." 2011, Presented at 8th International Congress Machines, Technologies, Materials,
  • "Dissimilar Metal Overlays for Oil and Gas Application." 2015, Presented at AWS Dissimilar Materials Welding / Joining Workshop,
  • "Recent Developments in Weldability Evaluation of Advanced Alloys." 2012, Presented at ASM International Annual Spring Symposium,
  • "Cracking in Weldments of Advanced Alloys." 2016, Presented at AWS Weld Cracking X Conference,
  • "Single Sensor Differential Thermal Analysis." 2007, Presented at Columbus Chapter Meeting,
  • "Application of a Novel Tool to Study the Phase Transformations in Welded Joints." 2007, Presented at 3rd International Congress in Industrial Welding Technology,
  • "Structural Weld Overlays in Nuclear Power Repair." 2015, Presented at Chalmers University of Technology, University West, GKN, Malmo University, Sweden,
  • "Cracking in Weldments of Advanced Alloys." 2016, Presented at Chalmers University of Technology, University West, GKN Sweden,
  • "Development of a Cr-free Consumable for Joining Austenitic Stainless Steels." 2007, Presented at 5th Charting the Course in Welding: U.S. Shipyards Conference, AWS,
  • "New Developments in Weldability Evaluation of Advanced Alloys." 2014, Presented at Chalmers University of Technology, University West, Lulea University, GKN Sweden,
  • "Welding of Dissimilar Materials for Oil and Gas, Petrochemical, and Power Generation Industries." 2016, Presented at AWS Welding of Advanced Materials Workshop,
  • "Non-equilibrium Phase diagrams of Advanced Engineering Alloys." 2007, Presented at MS&T’07,
  • "New Technique Determines Solid-Liquid and Solid State Phase Transformations during Welding." 2008, Presented at International North America Offshore Industry Conference, Bohler Welding Group,
  • "New Technique Determines Solid-Liquid and Solid State Phase Transformations during Welding." 2009, Presented at Weld Cracking VII “The Heat Affected Zone” Conference, AWS,
  • "Failure Analysis of Weldability Related Defects." 2010, Presented at Symposium Failure Analysis and Prevention, MS&T’10, ASM International,

Papers in Proceedings

2019

  • Lawmon, J.; Alexandrov, B.; Duffey, M.; Ngan, T. "Forming and Welding Innovations for Armor Steels.." in 2018 NDIA Ground Vehicle Systems Engineering and Technology Symposium. (6 2019).
  • Lolla, T.; Alexandrov, B.T.; Babu, S.; Cola, G. "Towards understanding the microstructure development during flash heating and cooling of steels." in 9th International Conference Processing and Manufacturing of Advanced Materials. (6 2019).
  • Lawson, B.; Alexandrov, B.; Bundy, J.; Benson, D. et al. "Development of Optimized Welding Consumable for Joining type 410 Martensitic Stainless Steel." in Pressure Vessels and Piping Conference. (7 2019).

2017

  • Sarich, C.; Alexandrov, B.; Benatar, A.; Penso, J. et al. "Weldability Evaluation of P87 and 230W Filler Metals in Alloy 230 to Grade P91 Steel Dissimilar Metal Weld." (1 2017).
  • Stone, D.J.; Alexandrov, B.T.; Penso, J.A. "CONTROL OF RETAINED DELTA FERRITE IN TYPE 410 STAINLESS STEEL." in ASME Pressure Vessels and Piping Conference. (1 2017).
  • Penso, G.C.; Alexandrov, B.T. "WELDING OF INTERNALLY CLAD X65 PIPES WITH PRECIPITATION STRENGTHENED NI-BASED FILLER METALS." in ASME Pressure Vessels and Piping Conference. (1 2017).
  • Stone, D.J.; Alexandrov, B.T.; Penso, J.A. "POST WELD HEAT TREATMENT AND FORMATION OF UNTEMPERED MARTENSITE IN 410 STEEL WELDS." in ASME Pressure Vessels and Piping Conference. (1 2017).
  • Sarich, C.; Alexandrov, B.; Benatar, A.; Penso, J. et al. "Weldability Evaluation of P87 and 230W Filler Metals in Alloy 230 to Grade P91 Steel Dissimilar Metal Weld." in ASME Pressure Vessels and Piping Conference. (1 2017).
  • Krustev, A.; Alexandrov, B.; Kovacich, J. "Modified GTAW orbital tube-to-tubesheet welding technique, and the effect of a copper weld retainer during welding of alloy 825." (1 2017).
  • He, M.; Lippold, J.; Alexandrov, B.; Penso, J. "EVALUATION OF THE SUSCEPTIBILITY OF DUPLEX STAINLESS STEEL 2205 TO HYDROGEN ASSISTED CRACKING IN REAC SYSTEMS." in ASME Pressure Vessels and Piping Conference. (1 2017).
  • Krustev, A.; Alexandrov, B.; Kovacich, J. "MODIFIED GTAW ORBITAL TUBE-TO-TUBESHEET WELDING TECHNIQUE, AND THE EFFECT OF A COPPER WELD RETAINER DURING WELDING OF ALLOY 825." (1 2017).
  • He, M.; Lippold, J.; Alexandrov, B.; Penso, J. "EVALUATION OF THE SUSCEPTIBILITY OF DUPLEX STAINLESS STEEL 2205 TO HYDROGEN ASSISTED CRACKING IN REAC SYSTEMS." (1 2017).
  • Krustev, A.; Alexandrov, B.; Kovacich, J. "MODIFIED GTAW ORBITAL TUBE-TO-TUBESHEET WELDING TECHNIQUE, AND THE EFFECT OF A COPPER WELD RETAINER DURING WELDING OF ALLOY 825." in ASME Pressure Vessels and Piping Conference. (1 2017).
  • Stone, D.J.; Alexandrov, B.T.; Penso, J.A. "POST WELD HEAT TREATMENT AND FORMATION OF UNTEMPERED MARTENSITE IN 410 STEEL WELDS." (1 2017).
  • Sarich, C.; Alexandrov, B.; Benatar, A.; Penso, J. et al. "Weldability evaluation of P87 and 230W filler metals in alloy 230 to grade P91 steel dissimilar metal weld." (1 2017).
  • Stone, D.J.; Alexandrov, B.T.; Penso, J.A. "Control of retained delta ferrite in type 410 stainless steel." (1 2017).
  • Penso, G.C.; Alexandrov, B.T. "Welding of internally clad X65 pipes with precipitation strengthened Ni-based filler metals." (1 2017).
  • Stone, D.J.; Alexandrov, B.T.; Penso, J.A. "CONTROL OF RETAINED DELTA FERRITE IN TYPE 410 STAINLESS STEEL." (1 2017).
  • Penso, G.C.; Alexandrov, B.T. "WELDING OF INTERNALLY CLAD X65 PIPES WITH PRECIPITATION STRENGTHENED NI-BASED FILLER METALS." (1 2017).

2016

  • A. E. Shapiro, B. T. Alexandrov and M. J. Duffey, "Evaluation of new silver-free brazing filler metal in the form of wire or paste." in LOT 2016: Brazing, High Temperature Brazing and Diffusion Bonding. (6 2016).
  • He, M.; Lippold, J.; Alexandrov, B.; Penso, J. "Evaluation of the susceptibility of duplex stainless steel 2205 to hydrogen assisted cracking in reac systems." (1 2016).
  • Stone, D.J.; Alexandrov, B.T.; Penso, J.A. "Post weld heat treatment and formation of untempered martensite in 410 steel welds." (1 2016).
  • Riggs, B.; Benatar, A.; Alexandrov, B.; Xu, R. "Evaluation of DCB and V-notch fracture mechanics test methods for high temperature brazed joints." in LOT 2015: Brazing, High Temperature Brazing and Diffusion Bonding. (6 2016).
  • Strader K., Alexandrov B., Lippold J. "Stress-Relief Cracking in Simulated-Coarse-Grained Heat Affected Zone of a Creep-Resistant Steel." in Cracking Phenomena in Welds IV. (1 2016).
  • Kuper, M.W.; Alexandrov, B.T.; Mills, M.J.; Burgess, D.J. "Dissimilar metal welds in grade 91 steel." (1 2016).
  • Stritch, K.; Alexandrov, B.T. "MICROSTRUCTURAL EVOLUTION AND MECHANICAL PROPERTIES IN SIMULATED HEAT AFFECTED ZONE REGIONS OF GRADE 91 WELDS." in 8th International Conference on Advances in Materials Technology for Fossil Power Plants. (1 2016).
  • Stritch, K.; Alexandrov, B.T. "Microstructural evolution and mechanical properties in simulated heat affected zone regions of grade 91 welds." (1 2016).
  • B. Riggs, A. Benatar, B. T. Alexandrov, R. Xu "Evaluation of DCB and V-notch fracture mechanics test methods for high temperature brazed joints." in LOT 2015: Brazing, High Temperature Brazing and Diffusion Bonding. (6 2016).
  • Kuper, M.W.; Alexandrov, B.T.; Mills, M.J.; Burgess, D.J. "DISSIMILAR METAL WELDS IN GRADE 91 STEEL." (1 2016).
  • Riggs, B.; Benatar, A.; Alexandrov, B.; Xu, R. "Multi-Scale FEA Modeling of High Temperature Brazed Joints Via Evaluation of Fracture Mechanics Test Methods." in LOT 2016: 11th International Conference on Brazing and Diffusion Bonding. (6 2016).
  • Stone D., B. Alexandrov, and J. Penso "Post weld heat treatment and formation of untempered martensite in 410 steel welds." in PVP'16. (7 2016).
  • Kuper, M.W.; Alexandrov, B.T.; Mills, M.J.; Burgess, D.J. "DISSIMILAR METAL WELDS IN GRADE 91 STEEL." in 8th International Conference on Advances in Materials Technology for Fossil Power Plants. (1 2016).
  • Bourgeois D., Alexandrov B., Lippold J., and Fenske J. "Metallurgical Factors Influencing the Susceptibility to Hydrogen Assisted Cracking in Dissimilar Metal Welds for Application under Cathodic Protection." in Cracking Phenomena in Welds IV. (1 2016).
  • Stritch, K.; Alexandrov, B.T. "MICROSTRUCTURAL EVOLUTION AND MECHANICAL PROPERTIES IN SIMULATED HEAT AFFECTED ZONE REGIONS OF GRADE 91 WELDS." (1 2016).
  • He M., B. Alexandrov, and J. Lippold, "Evaluation of the Susceptibility of Duplex Stainless Steel 2205 to Hydrogen Assisted Cracking in REAC System." in PVP'16. (7 2016).
  • Przybylowicz E., Luskin T., Alexandrov B., Lippold J., and McCracken S "Weldability Evaluation of High Chromium, Ni-base Filler Metals Using the Cast Pin Tear Test." in Cracking Phenomena in Welds IV. (1 2016).

2015

  • Lopez, C.; Phillips, J.; Alexandrov, B.; Gnanakaran, G. "Assembly and mechanistic details of drug translocation in MexAB-OprM efflux pump." (3 2015).
  • Lopez, C.; Phillips, J.; Alexandrov, B.; Gnanakaran, G. "Assembly and mechanistic details of drug translocation in MexAB-OprM efflux pump." (3 2015).
  • Duffey M., Marchal J., Loney M., Alexandrov B., and A. Shapiro "Strength of Brazed Joints and Metallurgical Characterization in Cu-4Sn-6P and Cu-40Zn-1Sn-0.3Si Silver-Free Filler Metals." in 6th International Brazing and Soldering Conference. (11 2015).
  • Riggs B., Alexandrov B., Benatar A., Xu R. "Thermodynamic Simulations of Single Crystal Superalloy CMSX-4 Brazed Joints with BNi-2 and BNi-9 Filler Metals." in 6th International Brazing and Soldering Conference. (11 2015).
  • Riggs B., Alexandrov B., Benatar A., Xu R "Microstructural Characterization of Single Crystal Superalloy CMSX-4 Brazed Joints with BNi-2 and BNi-9 Filler Metals." in 6th International Brazing and Soldering Conference. (11 2015).

2014

  • Alexandrov, B.T.; Steiner, J.M.; Strader, K.C.; Feng, X. et al. "Phase transformations and microstructure in gas tungsten ARC welds of grade 23 steel tubing." (1 2014).
  • Alexandrov B.T., J.M. Steiner, K.C. Strader, X. Feng, J.C. Lippold, J.E. Dierksheide, J.M. Tanzosh "Phase Transformations and Microstructure in Gas tungsten Arc Welds of Grade 23 Steel Tubing." in 7th International Conference Advances in Materials Technology for Fossil Power Plants. (4 2014).

2013

  • Alexandrov,Boian,T; Hope,Adam,T; Sutton,Benjamin,J; Lippold,John,C; Sowards,Jeffrey,W; McCracken,Steven,L "Susceptibility to Solidification Cracking in High Chromium Nickel-Base Filler Metals for Nuclear Power Applications." (1 2013).
  • Alexandrov, B.T.; Hope, A.T.; Sutton, B.J.; Lippold, J.C. et al. "Susceptibility to solidification cracking in high chromium nickel-base filler metals for nuclear power applications." (7 2013).
  • Alexandrov,Boian,T; Hope,Adam,T; Sutton,Benjamin,J; Lippold,John,C; Sowards,Jeffrey,W; McCracken,Steven,L "Susceptibility to Solidification Cracking in High Chromium Nickel-Base Filler Metals for Nuclear Power Applications." in 9th International Conference on Trends in Welding Research. (1 2013).
  • Alexandrov, B.T.; Hope, A.T.; Sutton, B.J.; Lippold, J.C. et al. "Susceptibility to Solidification Cracking in High Chromium Nickel-Base Filler Metals for Nuclear Power Applications." (1 2013).
  • Alexandrov, B.T.; Hope, A.T.; Sutton, B.J.; Lippold, J.C. et al. "Susceptibility to Solidification Cracking in High Chromium Nickel-Base Filler Metals for Nuclear Power Applications." in 9th International Conference on Trends in Welding Research. (1 2013).
  • Luskin T.C., B.T. Alexandrov, J.C. Lippold, S.S McCracken "Preliminary Finite Element Analysis and Optimization of the Cast Pin Tear Test, Proceedings." in Numerical Analysis of Weldability X. (2 2013).

2012

  • Alexandrov B.T., Shu Shi, J.M. Rodelas and J.C. Lippold "A New Test for Evaluation of Susceptibility to Hydrogen Assisted Cracking in Dissimilar Metal Welds." in Corrosion 2012. (5 2012).
  • Alexandrov B.T., J.C. Lippold, T.C. Luskin, A.T. Hope, B. Sutton "An Update on the Weldability of High Chromium Nickel-Base Filler Metals for Nuclear Power Applications." in Welding and Repair Technology for Power Plants X. (6 2012).
  • Alexandrov, B.T.; Shi, S.; Rodelas, J.M.; Lippold, J.C. "A new test for evaluation of susceptibility to hydrogen assisted cracking in dissimilar metal welds." (9 2012).
  • T.C. Luskin, B.T. Alexandrov, J.C. Lippold, S.S McCracken "Development and Validation of a New Generation Cast Pin Tear Test." in Welding and Repair Technology for Power Plants X. (6 2012).

2011

  • Alexandrov, B.T.; Lippold, J. "Further development of the cast pin tear test for evaluating solidification cracking in ni-base alloys." (12 2011).
  • L. Wang, B.T. Alexandrov, J.C. Lippold "New Predictive Formulae for the A1 Temperature in Grade 91 Steel." in Welding and Fabrication Technology for New Power Plants II. (6 2011).
  • Paulson, K.M.; Wang, J.; Topham, N.; Wu, C.Y. et al. "Alternatives for Joining Stainless Steel to Reduce Cr(VI) Emissions and Occupational Exposures." (5 2011).
  • Sowards, J.W.; Alexandrov, B.T.; Lippold, J.; Frankel, G.S. "Weldability of a New Ni-Cu Welding Consumable for Joining Austenitic Stainless Steels." in 3rd Workshop on Hot Cracking Phenomena Welds. (1 2011).
  • Sowards,J,W; Alexandrov,B,T; Lippold,John; Frankel,G,S "Weldability of a New Ni-Cu Welding Consumable for Joining Austenitic Stainless Steels." in 3rd Workshop on Hot Cracking Phenomena Welds. (1 2011).
  • Alexandrov B.T., J.W. Sowards, A.T. Hope, B.J. Sutton, J.C. Lippold, S. McCracken "Susceptibility to Solidification Cracking in High Chromium Nickel-Base Weld Alloys." in Welding and Fabrication Technology for New Power Plants II. (6 2011).
  • Paulson, K.M.; Wang, J.; Topham, N.; Wu, C.Y. et al. "Alternatives for joining stainless steel to reduce Cr(VI) emissions and occupational exposures." (5 2011).
  • Sowards, J.W.; Alexandrov, B.T.; Lippold, J.; Frankel, G.S. "Weldability of a New Ni-Cu Welding Consumable for Joining Austenitic Stainless Steels." (1 2011).
  • Paulson, K.M.; Wang, J.; Topham, N.; Wu, C.Y. et al. "Alternatives for Joining Stainless Steel to Reduce Cr(VI) Emissions and Occupational Exposures." (5 2011).

2010

  • Alexandrov, B.T.; Lippold, J.C. "In Situ Determination of Phase Transformations and Structural Changes During Non-Equilibrium Material Processing." in 1st International Workshop on In-situ Studies with Photons, Neurtrons and Electron Scattering. (1 2010).
  • McCracken, S.L.; Alexandrov, B.T.; Lippold, J.C.; Sowards, J.W. et al. "HOT CRACKING STUDY OF HIGH CHROMIUM NICKEL-BASE WELD FILLER METAL 52MSS (ERNiCrFe-13) FOR NUCLEAR APPLICATIONS." in ASME Pressure Vessels and Piping Division/K-PVP Conference. (1 2010).
  • McCracken, S.L.; Alexandrov, B.T.; Lippold, J.C.; Sowards, J.W. et al. "Hot cracking study of high chromium nickel-base weld filler metal 52MSS (ERNiCrFe-13) for nuclear applications." (12 2010).
  • Alexandrov, B.T.; Lippold, J.C. "In situ determination of phase transformations and structural changes during non-equilibrium material processing." (12 2010).
  • Alexandrov, B.T.; Lippold, J.C. "In Situ Determination of Phase Transformations and Structural Changes During Non-Equilibrium Material Processing." (1 2010).
  • Siefert J.A., B.T. Alexandrov, J.C. Lippold, J.M. Sanders, J.M. Tanzosh "Weld Metal Phase Transformations during PWHT of Grade 91 Welds." in Ninth International Conference Welding and Repair Technology for Power Plants IX. (1 2010).
  • Wang, L.; Alexandrov, B.; Lippold, J. "Predicting A1temperature in CSEF steels." (11 2010).
  • McCracken, S.L.; Alexandrov, B.T.; Lippold, J.C.; Sowards, J.W. et al. "HOT CRACKING STUDY OF HIGH CHROMIUM NICKEL-BASE WELD FILLER METAL 52MSS (ERNiCrFe-13) FOR NUCLEAR APPLICATIONS." (1 2010).
  • Paulson K.M., J. Wang, N. Topham, C-Y. Wu, B.T. Alexandrov, J.C. Lippold, O. Es-Said "Alternatives for Joining Stainless Steel to Reduce Cr(VI) Emissions and Occupational Exposures." in Proceedings, SNAME 2010 Maritime Technology Conference. (1 2010).
  • Wang L., B.T. Alexandrov, J.C. Lippold "Predicting the Critical Phase Transformation Temperatures in CSEF Steels." in Ninth International Conference Welding and Repair Technology for Power Plants IX. (1 2010).
  • Alexandrov B. T. and J. C. Lippold "In-Situ Determination of Phase Transformations and Structural Changes during Non-equilibrium Material Processing." in In-Situ Studies with Photons, Neutrons and Electrons Scattering. (1 2010).
  • McCracken,Steven,L; Alexandrov,Boian,T; Lippold,John,C; Sowards,Jeffrey,W; Hope,Adam,T "HOT CRACKING STUDY OF HIGH CHROMIUM NICKEL-BASE WELD FILLER METAL 52MSS (ERNiCrFe-13) FOR NUCLEAR APPLICATIONS." in ASME Pressure Vessels and Piping Division/K-PVP Conference. (1 2010).

2009

  • Alexandrov,B; Lippold,J; Tatman,J; Murray,G "Non-Equilibrium Phase Transformation Diagrams in Engineering Alloys." in 8th International Conference on Trends in Welding Research. (1 2009).
  • Siefert, J.; Alexandrov, B.; Lippold, J.; Sanders, J. et al. "An Update on the Phase Transformations during PWHT of Grade P91 Steel." in Welding and Fabrication Technology for New Power Plants I. (6 2009).
  • Alexandrov B.T., Hope A.T., Sowards J.W., Lippold J.C., and McCracken S.S. "Susceptibility to Solidification Cracking in High Chromium Nickel-Base Weld Filler Metals, Welding and Fabrication Technology for New Power Plants." in Welding and Fabrication Technology for New Power Plants I. (6 2009).
  • Siefert J., B. Alexandrov, J. Lippold, J. Sanders, and J. Tanzosh "An Update on the Phase Transformations during PWHT of Steel P91, Welding and Fabrication Technology for New Power Plants." in Welding and Fabrication Technology for New Power Plants I. (6 2009).
  • Siefert, J.; Sanders, J.; Tanzosh, J.; Alexandrov, B. et al. "An Update on the Phase Transformations during PWHT of Grade P91 Steel." in Welding and Fabrication Technology for New Power Plants. (12 2009).
  • Alexandrov, B.; Lippold, J.; Tatman, J.; Murray, G. "Non-equilibrium phase transformation diagrams in engineering alloys." (12 2009).
  • Siefert, J.; Sanders, J.; Tanzosh, J.; Alexandrov, B. et al. "An update of phase transformations during PWHT of grade 91." (12 2009).
  • Faith C., Gould E.K., McNeal A.V., Alexandrov B. T., and Shapiro A.E. "Evaluation Of Brazed And Soldered Joints After Thermal Cycling In Liquid Nitrogen." in 4th International Brazing and Soldering Conference. (1 2009).
  • Alexandrov, B.; Lippold, J.; Tatman, J.; Murray, G. "Non-Equilibrium Phase Transformation Diagrams in Engineering Alloys." (1 2009).
  • Alexandrov, B.; Lippold, J.; Tatman, J.; Murray, G. "Non-Equilibrium Phase Transformation Diagrams in Engineering Alloys." in 8th International Conference on Trends in Welding Research. (1 2009).

2008

  • Alexandrov B. T., J. C. Lippold, J. K. Tatman, and G. M. Murray "Controlling the Microstructure in AHSS Steel Welds." in Sheet Metal Welding Conference VIII, AWS. (5 2008).
  • Alexandrov,B,T; LIPPOLD,J,C; Nissley,N,E "Evaluation of Weld Solidification Cracking in Ni-Base Superalloys Using the Cast Pin Tear Test." in 2nd International Workshop on Hot Cracking Phenomena in Welds. (1 2008).
  • Lippold, J.C.; Sowards, J.W.; Murray, G.M.; Alexandrov, B.T. et al. "Weld Solidification Cracking in Solid-Solution Strengthened Ni-Base Filler Metals." (1 2008).
  • LIPPOLD,J,C; Sowards,J,W; Murray,G,M; Alexandrov,B,T; Ramirez,A,J "Weld Solidification Cracking in Solid-Solution Strengthened Ni-Base Filler Metals." in 2nd International Workshop on Hot Cracking Phenomena in Welds. (1 2008).
  • Alexandrov B. T., J. C. Lippold, J.K. Tatman, and G.M. Murray "Non-equilibrium Phase Transformation Diagrams in Engineering Alloys." in 8th International Trends in Welding Research Conference. (1 2008).
  • Sinfield, M.F., J.C. Lippold, and B.T. Alexandrov "Physical Simulation of Friction Stir Weld Microstructure of a High-Strength, Low Alloy Steel (HSLA-65)." in 7th International Symposium on Friction Stir Welding, TWI. (5 2008).
  • Siefert J., B. Alexandrov1, J. Lippold, J. Sanders, and J. Tanzosh "Examination of Phase Transformations during PWHT of Steel P91, Safety and Reliability of Welded Components in Energy and Processing Industry." in Proceedings, 61st IIW International Conference, IIW. (7 2008).
  • Alexandrov B. T., J. C. Lippold, and N. E. Nissley "Evaluation of Weld Solidification Cracking in Ni-Base Superalloys Using the Cast Pin Tear Test." in Hot Cracking Phenomena in Welds II. (9 2008).
  • Alexandrov, B.T.; Lippold, J.C.; Nissley, N.E. "Evaluation of weld solidification cracking in ni-base superalloys using the castpin tear test." (1 2008).
  • Lippold, J.C.; Sowards, J.W.; Murray, G.M.; Alexandrov, B.T. et al. "Weld solidification cracking in solid-solution strengthened ni-base filler metals." (1 2008).
  • Alexandrov, B.T.; Lippold, J.C.; Nissley, N.E. "Evaluation of Weld Solidification Cracking in Ni-Base Superalloys Using the Cast Pin Tear Test." in 2nd International Workshop on Hot Cracking Phenomena in Welds. (1 2008).
  • Lippold, J.C.; Sowards, J.W.; Murray, G.M.; Alexandrov, B.T. et al. "Weld Solidification Cracking in Solid-Solution Strengthened Ni-Base Filler Metals." in 2nd International Workshop on Hot Cracking Phenomena in Welds. (1 2008).
  • Alexandrov, B.T.; Lippold, J.C.; Nissley, N.E. "Evaluation of Weld Solidification Cracking in Ni-Base Superalloys Using the Cast Pin Tear Test." (1 2008).

2007

  • W. Sowards, J.C. Lippold, B.T. Alexandrov, D. Liang, G.S. Frankel "Ni-Cu-Pd and Ni-Cu-Ru filler metals for joining austenitic stainless steels." in Proceedings, Stainless Steel World 2007. (1 2007).

2006

  • Alexandrov, B.T.; Lippold, J.C. "A New Methodology for Studying Phase Transformations in High Strength Steel Weld Metal." in 7th International Conference on Trends in Welding Research. (1 2006).
  • Alexandrov, B.T.; Lippold, J.C. "A New Methodology for Studying Phase Transformations in High Strength Steel Weld Metal." (1 2006).
  • Alexandrov,B,T; LIPPOLD,J,C "A New Methodology for Studying Phase Transformations in High Strength Steel Weld Metal." in 7th International Conference on Trends in Welding Research. (1 2006).

2005

  • Alexandrov, B.T.; Lippold, J.C. "A new methodology for studying phase transformations in high strength steel weld metal." (12 2005).
  • Alexandrov, B.T.; Lippold, J. "Relationship between the solidification temperature range and weld solidification cracking susceptibility of stainless steels and Ni-base alloys." in 58th Annual Assembly of IIW. (7 2005).
  • Lippold J.C., B.T. Alexandrov, M. Gonser, Y.H. Kim, D. Liang, and G.S. Frankel "Development of Ni-Cu Filler Metals for Joining Austenitic Stainless Steels." in 4th Stainless Steel World 2005 Conference. (11 2005).

2004

  • Alexandrov, B.T.; Lippold, J.C. "Methodology for in situ investigation of phase transformations in welded joints.." in 57th Annual Assembly of IIW. (7 2004).
  • Lippold J. C. and B. T. Alexandrov "Phase Transformations during Welding and Post Weld Heat Treatment of Supermartensitic Stainless Steel." in 3rd Stainless Steel World America Conference. (10 2004).

2003

  • Alexandrov B. T. "Hydrogen Behaviour in Welded Joints and Evaluation of its Role for Cold Cracking, Part One: State of the Problem." in Mathematical Modeling of Weld Phenomena 7. (1 2003).
  • Alexandrov B. T. "Hydrogen Behaviour in Welded Joints and Evaluation of its Role for Cold Cracking, Part Two: Experimental and Modelling Investigations." in Mathematical Modeling of Weld Phenomena 7. (1 2003).

2002

  • Lolov N., M. Beloev, B. Alexandrov, M. Lozanov "Influence of Cooling Rate on Microstructure and Impact Toughness in HAZ of Steel S355." in 11th International Metallurgy and Materials Congress, Proceedings. (6 2002).
  • Alexandrov B., M. Lolov "Study of Weld Bead Formation in Gas Metal Arc Welding." in Int. Congress MEET/MARIND 2002. (10 2002).
  • Saev G., B. Alexandrov, M. Lolov and R. Rachkov "Procedures for Welding and Testing of Bottles for Liquid Gas." in Scientific News of the National Scientific Union on Machine-building. (6 2002).
  • Alexandrov B., M. Lolov, M. Lozanov "Investigation of the Process of Cold Cracking in High Strength Structural Steel by Implant Test." in Int. Congress MEET/MARIND 2002. (10 2002).

2001

  • Saev G. and B. Alexandrov "Comparison of Methods for Determination of Preheat Temperature in Welding of Low Alloy Structural Steels." in International Conference AMTEX 2001. (10 2001).

1999

  • Alexandrov B.T., M. Tongov and M. Lozanov "About the Applicability of a Method for Digital Registration of Weld Thermal Cycles." in International Scientific Conference AMTECH ’99. (6 1999).
  • Alexandrov B.T. "Method for In-situ Determination of Phase Transformation Temperatures in Welded Joints." in International Scientific Conference AMTECH ’99. (6 1999).
  • Shelev Al., N. Lolov, St. Christov and B. Alexandrov "Influence of the Production Loss of Quality on the In-service Reliability of Welded joints." in International Conference “Welding on the threshold of XXI Century”. (5 1999).
  • Shelev Al., N. Lolov, M. Lozanov, M. Tongov and B. Alexandrov "Observation, Recording and Analysis of the Electric Arc Process during Gas Metal Arc Welding." in International Scientific Conference AMTECH ’99. (6 1999).
  • Shelev Al., M. Tongov, B. Alexandrov "Possibilities for Application of Thermal Spray Layers." in International Scientific Conference AMTECH ’99. (6 1999).

1997

  • Alexandrov B. and G. Saev "Computer Investigation of Hydrogen Behavior in Weldments." in International Congress "Mechanical Engineering Technologies". (9 1997).

1996

  • Alexandrov B.T. "An Approach for Investigation of the Hydrogen Behavior during Welding." in Development of Metallurgy in the Balkans at the Beginning of the XXI Century. (5 1996).

1995

  • Shelev Al., N. Lolov, S. Serafimov, B. Alexandrov et. al. "Trends and Achievements in the Scientific Research on Welding of Metals at TU Sofia." in Scientific Conference “50 years Dept. Materials Science and Engineering”. (1 1995).
  • Alexandrov B. ?. "Temperature Relationship of Hydrogen Diffusion Coefficient in Welding Conditions." in Scientific Conference “50 years Dept. Materials Science and Engineering”. (1 1995).
  • Alexandrov, B.; Saev, G. "Computational Modeling Based Design of Experiment on Hydrogen Behaviour in Weldments." in Scientific Conference “AMTECH’95”. (1 1995).
  • Alexandrov B. and G. Saev "Designed Computer Investigation of Hydrogen Behaviour in Weldments." in Scientific Conference “AMTECH’95”. (1 1995).

1994

  • Alexandrov B. T., M. Mitev and E. Semov "Equipment for Measurement of Hydrogen in Welded Joints." in Scientific Session, Higher Military School of Transportation. (11 1994).
  • Alexandrov B. T. "Procedure for Digital Recording and Analysis of Welding Thermal Cycles." in VII Scientific Session. (11 1994).

1989

  • Velkov K., and B. T. Alexandrov "Evaluation of the Influence of Microconstituents’ Content in HAZ on the Hydrogen Diffusivity." in Proceedings of International Conference Welding Processes and Welded Joints. (1 1989).

Unknown

  • Kuper M.W., B.T. Alexandrov, M.J. Mills, J. Burgess "Dissimilar Metal Welds in Grade 91 and 92 Steels." in 8th International Conference on Advances in Materials Technology for Fossil Power Plants.
  • Stritch K., B. Alexandrov "Microstructural Evolution and Mechanical Properties in Simulated Heat Affected Zone Regions of Grade 91 Steel Welds." in 8th International Conference on Advances in Materials Technology for Fossil Power Plants.

Patents

  • Alexandrov B. T. and J. C. Lippold. "Method and Device for Investigation of Phase Transformations in Metals and Alloys." Patent number: 7,473,028
  • Alexandrov B. T. and J. C. Lippold. "Method and Device for Investigation of Phase Transformations in Metals and Alloys." Patent number: 7,909,505
  • Tongov M., S. Serafimov and B. Alexandrov. "Catheter." Patent number: Application, No 102934
  • Velkov K. and B. T. Alexandrov. "Device for measurement of diffusible hydrogen." Patent number: Certificate of Invention, ? 46253/1988
  • Velkov K. and B. T. Alexandrov. "Device for measurement of diffusible hydrogen."
  • Tongov M., S. Serafimov and B. Alexandrov. "Catheter."