Structure and mechanical properties of welded joints of high strength steels at the hybrid laser-arc welding

Authors

  • L. I. Markashova Paton Welding Institute of the NAS of Ukraine, Kazimira Malevicha str, 11, 03650, Kyiv, Ukraine, Ukraine
  • V. D. Poznyakov Paton Welding Institute of the NAS of Ukraine, Kazimira Malevicha str, 11, 03650, Kyiv, Ukrain, Ukraine
  • V. D. Shelyagin Paton Welding Institute of the NAS of Ukraine, Kazimira Malevicha str, 11, 03650, Kyiv, Ukraine,, Ukraine
  • O. M. Berdnikova Paton Welding Institute of the NAS of Ukraine, Kazimira Malevicha str, 11, 03650, Kyiv, Ukraine, Ukraine
  • S. L. Zhdanov Paton Welding Institute of the NAS of Ukraine, Kazimira Malevicha str, 11, 03650, Kyiv, Ukraine, Ukraine
  • Т. A. Alekseenko Paton Welding Institute of the NAS of Ukraine, Kazimira Malevicha str, 11, 03650, Kyiv, Ukraine, Ukraine

Keywords:

high-strength steel, the hybrid laser-arc welding, welded joints, metal structure, mechanical properties, fracture toughness, crack resistance.

Abstract

Purpose.Nowadays  the  production  of  critical  welded  structures  of  high-strength  steels  more  and  more  new technologies are used hybrid laser-arc welding, which increase the productivity of the process and provide the strength and plasticity of welded joints. The aim of this study was to investigate the features of phase and structural changes in the metal of welded joints of high-strength  steel  obtained  by  hybrid  laser-arc  welding  and  evaluate  the  effect  of  one  of  the  main  technological  parameters -welding speed on a formed structure and mechanical properties of welded joints. Methodology.Studies were carried out on welded joints of high-strength steel 14HGN2MDAFB. Welds were obtained in conditions of diverse speeds (72-110 m / h) of the hybrid laser arc welding. The structural changes were studied using a complex technique of research, which includes optical metallography, analytical  scanning  and  transmission  electron  microscopy. Findings. On  the  basis  of  information  obtained  at  different  structural levels (from grain to dislocation) the analytical assessment of the impact of the structural parameters on the mechanical properties and fracture toughness of welds are made. Originality. Optimal technological modes of the hybrid laser-arc welding of high strength steel 14HGN2MDAFB providing, in terms of formed structure, high mechanical properties and fracture toughness of metal welded connections have been established. Practical value. The presented results showed the prospect of the development of technological modes of the hybrid laser-arc and solutions  of objectives of formation of the most  favourable structure of welded  joints of highstrength steel to provide the necessary complex mechanical properties and fracture toughness of welds.

Author Biographies

L. I. Markashova, Paton Welding Institute of the NAS of Ukraine, Kazimira Malevicha str, 11, 03650, Kyiv, Ukraine

Dr. Sc. (Tech.), Prof

V. D. Poznyakov, Paton Welding Institute of the NAS of Ukraine, Kazimira Malevicha str, 11, 03650, Kyiv, Ukrain

Dr. Sc. (Tech.), Corr. Member of the NAS of Ukraine

V. D. Shelyagin, Paton Welding Institute of the NAS of Ukraine, Kazimira Malevicha str, 11, 03650, Kyiv, Ukraine,

Cand. Sc. (Tech.)

O. M. Berdnikova, Paton Welding Institute of the NAS of Ukraine, Kazimira Malevicha str, 11, 03650, Kyiv, Ukraine

Cand. Sc. (Tech.)

S. L. Zhdanov, Paton Welding Institute of the NAS of Ukraine, Kazimira Malevicha str, 11, 03650, Kyiv, Ukraine

Cand. Sc. (Tech.)

Т. A. Alekseenko, Paton Welding Institute of the NAS of Ukraine, Kazimira Malevicha str, 11, 03650, Kyiv, Ukraine

Cand. Sc. (Tech.)

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Стаття рекомендована до публікації д-ром. техн. наук, проф. В.І. Большаковим (Україна), д-ром. тех. наук, проф. Д.В. Лаухіним (Україна)

Published

2016-03-22

Issue

Section

Proceedings in memory of Starodubov