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High-hardness armor welded by CW-GMAW: economic, geometric and CGHAZ analysis

  • Charles H. M. VasconcelosEmail author
  • C. R. L. Loayza
  • Paulo D. C. Assunção
  • Francisco F. B. Junior
  • Paola E. C. Baia
  • Diego J. A. Borges
  • Eduardo M. Braga
Technical Paper
  • 37 Downloads

Abstract

High-hardness steel is widely used in the armor industry due to their mechanical properties that combines hardness and toughness, which generates a great resistance to the impact of projectiles. Almost all applications in the armor industry include the welding of its components; however, several modifications could happen in the microstructure. For instance, one main region involved in the welding performance is the coarse-grained heat-affected zone (CGHAZ), especially in high-hardness steel, due to the formation of highly brittle, non-tempered martensitic. Furthermore, studies concerning the influence of the variations in welding parameters and the addition of cold wire have not been conducted so far. In this paper, we determined the influences of the welding parameters on the economical, geometric and coarse-grained heat-affected zone of the weld beads. In addition, the influences of the cold wire are also shown. To perform the experimental procedure, two parameters were tested: the industrial parameters, used for the conventional steel welding, and the experimental parameters, obtained in this study. The welding velocity and dilution were 150% and 53% higher, respectively. Besides, the deposition rate was 100% greater for the improved parameters with a 50% reduction in the CGHAZ area.

Keywords

Welding Super steel High-hardness steel Armox 500T Heat-affected zone 

Notes

Acknowledgements

The authors would also like to provide special thanks to the work teams from the Material Characterization Laboratory (LCAM) of the Federal University of Para (UFPA), where all the experimental tests were performed, and special thanks to the Engineering of Natural Resources of the Amazon Graduate Program (PRODERNA) which provided the e-mail corresponds author’s scholarship of CNPq, number 170412/2017-2. CL received a scholarship from CAPES under the supervision of the Partnerships Program for Education and Training (PAEC) between the Organization of American States (OAS) and the Coimbra Group of Brazilian Universities (GCUB), with the support of the Brazilian Ministry of Foreign Affairs’ Division of Educational Topics and the Pan American Health Organization (PAHO/WHO). Special acknowledgments are to TECMETAL for the microstructure analyses.

References

  1. 1.
    Hanhold B, Babu S, Cola G (2013) Investigation of heat affected zone softening in armour steels part 1—phase transformation kinetics. Sci Technol Weld Join 18(3):247–252CrossRefGoogle Scholar
  2. 2.
    Modenesi PJ, Marques PV, Santos DB (2012) Introdução à metalurgia da soldagem. UFMG, Belo HorizonteGoogle Scholar
  3. 3.
    Gooch W, Showalter D, Burkins M, Montgomery J, Squillacioti R, Nichols A, Martin L, Bailey R, Swiatek G (2009) Development and ballistic testing of a new class of auto-tempered high hard steels under military specification Mil-Dtl-46100e. Tech. rep., Army Research Lab Aberdeen Proving Ground MDGoogle Scholar
  4. 4.
    Hodge J, Joyce H (1948) A study of ballistic and metallurgical characteristics of steel aircraft armor. Tech. rep., Carnegie-Illinois Steel Corp Pittsburgh PAGoogle Scholar
  5. 5.
    Jena P, Mishra B, Rameshbabu M, Babu A, Singh A, Sivakumar K, Bhat TB (2010) Effect of heat treatment on mechanical and ballistic properties of a high strength armour steel. Int J Impact Eng 37(3):242–249CrossRefGoogle Scholar
  6. 6.
    Magudeeswaran G, Balasubramanian V, Reddy GM (2008) Hydrogen induced cold cracking studies on armour grade high strength, quenched and tempered steel weldments. Int J Hydrogen Energy 33(7):1897–1908CrossRefGoogle Scholar
  7. 7.
    Mohandas T, Reddy GM, Kumar BS (1999) Heat-affected zone softening in high-strength low-alloy steels. J Mater Process Technol 88(1–3):284–294CrossRefGoogle Scholar
  8. 8.
    Grujicic M, Snipes J, Galgalikar R, Ramaswami S, Yavari R, Yen C-F, Cheeseman B (2014) Ballistic-failure mechanisms in gas metal arc welds of mil a46100 armor-grade steel: a computational investigation. J Mater Eng Perform 23(9):3108–3125CrossRefGoogle Scholar
  9. 9.
    Reddy GM, Mohandas T (1996) Ballistic performance of high-strengh low-alloy steel weldments. J Mater Process Technol 57(1–2):23–30CrossRefGoogle Scholar
  10. 10.
    Cabral TS, de Magalhães Braga E, Augusto Maciel Mendonça E, Scott A (2015) Influence of procedures and transfer modes in mag welding in the reduction of deformations on marine structure panels. Weld Int 29(12):928–936CrossRefGoogle Scholar
  11. 11.
    Assunção PDC, Ribeiro R, Dos Santos EB, Gerlich AP, de Magalhães Braga E (2017) Feasibility of narrow gap welding using the cold-wire gas metal arc welding (cw-gmaw) process. Weld World 61(4):659–666CrossRefGoogle Scholar
  12. 12.
    Marques L, Santos E, Gerlich A, Braga E (2017) Fatigue life assessment of weld joints manufactured by gmaw and cw-gmaw processes. Sci Technol Weld Join 22(2):87–96CrossRefGoogle Scholar
  13. 13.
    Ribeiro R, Santos E, Assunção P, Maciel R, Braga E (2015) Predicting weld bead geometry in the novel cw-gmaw process. Weld J 94(September):301s–311sGoogle Scholar
  14. 14.
    Nakamura T, Hiraoka K (2001) Ultranarrow gmaw process with newly developed wire melting control system. Sci Technol Weld Join 6(6):355–362CrossRefGoogle Scholar
  15. 15.
    Mvola B, Kah P (2017) Effects of shielding gas control: welded joint properties in gmaw process optimization. Int J Adv Manuf Technol 88(9–12):2369–2387CrossRefGoogle Scholar
  16. 16.
    Kou S (2003) Welding metallurgy, New Jersey, USA, pp 431–446Google Scholar
  17. 17.
    Costa E, Assunção P, Dos Santos EB, Feio L, Bittencourt M, Braga E (2017) Residual stresses in cold-wire gas metal arc welding. Sci Technol Weld Join 22(8):706–713CrossRefGoogle Scholar
  18. 18.
    Gery D, Long H, Maropoulos P (2005) Effects of welding speed, energy input and heat source distribution on temperature variations in butt joint welding. J Mater Process Technol 167(2–3):393–401CrossRefGoogle Scholar
  19. 19.
    Malik MA, Qureshi ME, Dar NU (2007) Numerical simulation of arc welding investigation of various process and heat source parameters. Fail Eng Struct 30:127–142Google Scholar
  20. 20.
    Demir T, Übeyli M, Yıldırım R (2009) Effect of hardness on the ballistic impact behavior of high-strength steels against 7.62-mm armor piercing projectiles. J Mater Eng Perform 18(2):145–153CrossRefGoogle Scholar

Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2019

Authors and Affiliations

  • Charles H. M. Vasconcelos
    • 1
    Email author
  • C. R. L. Loayza
    • 1
    • 2
  • Paulo D. C. Assunção
    • 2
  • Francisco F. B. Junior
    • 3
  • Paola E. C. Baia
    • 3
  • Diego J. A. Borges
    • 1
  • Eduardo M. Braga
    • 1
    • 2
    • 3
  1. 1.Programa de Pós-graduação em Engenharia Mecânica (PPGEM/UFPA)Universidade Federal do ParáBelémBrazil
  2. 2.Programa de Pós-Graduação em Engenharia de Recursos Naturais da Amazônia (PRODERNA/ITEC/UFPA)Universidade Federal do ParáBelémBrazil
  3. 3.Faculdade de Engenharia MecânicaUniversidade Federal do ParáBelémBrazil

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